#294

.gitea/ISSUE_TEMPLATE.md

@@ -1,35 +0,0 @@
-## 背景
-
-なぜ必要か。
-
-## 対象範囲
-
-- backend:
-- frontend:
-- docs:
-- migration:
-
-## やること
-
-- [ ] 
-
-## 受け入れ条件
-
-- [ ] 
-
-## 実行すべき確認
-
-- [ ] `cd backend && bundle exec rspec`
-- [ ] `cd frontend && npm run build`
-- [ ] `cd frontend && npm run lint`
-
-## 禁止事項
-
-- unrelated refactor はしない
-- 既存 API response shape を壊さない
-- 認証・認可・BAN を弱めない
-
-## Codex への指示
-
-この issue を読んで実装してください。
-不明点があれば、実装前に調査結果と選択肢を提示してください。

AGENTS.md

@@ -1,228 +0,0 @@
-# AGENTS.md
-
-## Project overview
-
-BTRC Hub / タグ広場 is a split Rails API and React frontend repository.
-
-- Backend: Rails API under `backend/`.
-- Frontend: React + TypeScript + Vite under `frontend/`.
-- Docs: lightweight command notes under `docs/`.
-- There is no README or Makefile at the repository root as of this inspection.
-
-## Stack
-
-- Backend: Ruby `3.2.2` from `backend/.ruby-version`, Rails `~> 8.0.2`.
-- Backend dependencies include `mysql2`, `sqlite3`, `rspec-rails`,
-  `factory_bot_rails`, `rack-cors`, `jwt`, `discard`, `gollum`, `whenever`,
-  `aws-sdk-s3`, `brakeman`, and `rubocop-rails-omakase`.
-- Frontend: React `^19.1.0`, TypeScript `~5.8.3`, Vite `^6.3.5`.
-- Frontend data/UI dependencies include Axios, TanStack Query, Tailwind CSS,
-  Framer Motion, Radix UI components, lucide-react, MDX/Markdown tooling, and
-  Zustand.
-
-## Main directories
-
-- `backend/app/controllers`: Rails API controllers.
-- `backend/app/models`: Active Record models.
-- `backend/app/representations`: API response representation classes.
-- `backend/app/services`: domain services such as version recording,
-  wiki commit, YouTube sync, and similarity calculation.
-- `backend/config/routes.rb`: API routes.
-- `backend/db/migrate`: migrations.
-- `backend/db/schema.rb`: current schema snapshot.
-- `backend/lib/tasks`: custom Rake tasks.
-- `backend/spec`: RSpec tests.
-- `backend/test`: Rails minitest files that still exist in the tree.
-- `frontend/src/App.tsx`: frontend route definitions and initial user setup.
-- `frontend/src/pages`: page-level React components.
-- `frontend/src/components`: shared and feature components.
-- `frontend/src/lib`: API client helpers, query keys, prefetchers, and domain helpers.
-- `frontend/src/stores`: Zustand stores.
-- `docs/commands.md`: command notes.
-
-## Commands
-
-Only list commands that are backed by files inspected in this repository.
-
-### Backend
-
-The following binstubs exist under `backend/bin`:
-
-```sh
-cd backend
-bin/setup
-bin/dev
-bin/rails
-bin/rake
-bin/rubocop
-bin/brakeman
-bin/kamal
-bin/thrust
-```
-
-Common Rails/Rake usage through existing binstubs:
-
-```sh
-cd backend
-bin/rails db:prepare
-bin/rails db:migrate
-bin/rails routes
-bin/rails server
-bin/rake
-bin/rubocop
-bin/brakeman
-```
-
-RSpec is present in `Gemfile` and `.rspec` exists:
-
-```sh
-cd backend
-bundle exec rspec
-```
-
-### Frontend
-
-The following npm scripts exist in `frontend/package.json`:
-
-```sh
-cd frontend
-npm run dev
-npm run build
-npm run lint
-npm run test
-npm run test:run
-npm run preview
-```
-
-`npm run build` runs `tsc -b && vite build`, then `postbuild` runs
-`node scripts/generate-sitemap.js`.
-
-`npm run test` runs Vitest in watch mode. Use `npm run test:run` for a non-watch frontend test run.
-
-## Coding style
-
-- Prefer precise, minimal changes.
-- Do not flatter or over-explain.
-- Explain risks directly.
-- Prefer single quotes for strings unless interpolation or escaping makes
-  double quotes better.
-- Ruby: never put a space before method-call parentheses.
-- Ruby: never put a line break immediately before `)`.
-- Ruby: do not use `%w` or `%i`.
-- Ruby hashes are not blocks; keep `}` on the same line as the final pair.
-- Ruby hashes keep the first pair on the same line as `{` unless line length
-  requires a break.
-- Ruby blocks use separate `{ ... }` rules from hashes, with 2-space body
-  indentation.
-- For arrays, never put whitespace or a line break immediately before `]`.
-- Keep the first element on the same line as `[` by default.
-- If an array would exceed the line limit, break after `[` and indent
-  elements by 4 spaces.
-- TypeScript and Python: use GNU-style spacing before parentheses where
-  syntactically valid.
-- Never write Ruby, TypeScript, or TSX lines longer than 99 characters.
-- Aim to keep Ruby, TypeScript, and TSX lines within 79 characters where practical.
-- TypeScript and TSX use 4-space logical indentation.
-- In TypeScript and TSX only, replace every leading run of 8 spaces with a tab.
-- Tabs are only for leading indentation, never for spaces after non-space text.
-- Do not add production dependencies without explicit approval.
-
-## Backend rules
-
-- Inspect existing routes, controllers, models, services, and specs before
-  editing backend behavior.
-- For API behavior changes, add or update request specs under `backend/spec/requests`.
-- Prefer RSpec for new backend tests; existing minitest files under
-  `backend/test` do not make minitest the default for new coverage.
-- Do not weaken authentication, BAN user checks, or IP BAN checks.
-- Preserve the `X-Transfer-Code` user identification flow unless the task
-  explicitly changes authentication.
-- Be careful with version tables, `version_no`, optimistic concurrency,
-  wiki revisions, and restore/diff behavior.
-- Be careful with tag names, tag normalization, implications, similarities, and discard behavior.
-- Be sensitive to N+1 queries; avoid introducing them and proactively fix
-  existing N+1 issues in the code path being edited.
-- Keep migration files and `backend/db/schema.rb` consistent when changing schema.
-
-## Frontend rules
-
-- Use `frontend/src/lib/api.ts` for API calls so headers and camelCase conversion stay consistent.
-- Add or reuse TanStack Query keys through `frontend/src/lib/queryKeys.ts`;
-  avoid ad hoc query key arrays.
-- Encode URL path-segment values with `encodeURIComponent`.
-- React hooks must be called unconditionally.
-- Keep page-level code under `frontend/src/pages` and shared UI/feature code
-  under `frontend/src/components` unless existing patterns point elsewhere.
-- Match existing Tailwind, component, and import alias conventions.
-
-### Frontend TSX style
-
-- Preserve the local TSX formatting style.
-- Do not normalize TSX to common Prettier-style React formatting unless
-  explicitly asked.
-- Prefer `const` arrow functions for TypeScript/TSX component and helper declarations.
-- Put two blank lines before and after top-level `const` function
-  declarations, unless imports, exports, or file boundaries make that awkward.
-- In TSX, indent with 4-space logical indentation.
-- A leading tab is exactly equivalent to 8 leading spaces.
-- Keep a tag's closing marker on the same line as the final prop when the tag
-  spans multiple lines.
-- Do not put `/>` or `>` on its own line unless the existing surrounding code
-  does so.
-- Keep JSX closing parentheses in the existing compact style, for example
-  `</div>)` rather than moving `)` onto a separate line.
-- Do not add braces around `if`, `else`, or `for` bodies when the body is a
-  single physical line.
-- Always add braces around `if`, `else`, or `for` bodies when the body spans
-  two or more physical lines, even if it is one statement.
-
-Preferred:
-
-```tsx
-const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
-  return (
-      <TextArea
-	  {...rest}
-	  ref={ref}
-	  value={tags}
-	  invalid={errors && errors.length > 0}
-	  onChange={ev => setTags (ev.target.value)}/>)
-}
-```
-
-Avoid:
-
-```tsx
-function PostFormTagsArea ({ tags, setTags }: Props) {
-  return (
-    <TextArea
-      value={tags}
-      onChange={ev => setTags (ev.target.value)}
-    />
-  )
-}
-```
-
-## Codex workflow
-
-- First inspect existing patterns; do not invent new architecture when a local convention exists.
-- Keep changes scoped to the requested issue.
-- Do not scan or summarize dependency/generated/runtime directories such as
-  `node_modules`, `dist`, `tmp`, `log`, and `storage` unless explicitly needed.
-- Before touching wiki, tag, versioning, BAN, IP BAN, or authentication
-  behavior, inspect the related request specs and service objects.
-- If frontend code changes, run the existing frontend verification commands
-  that apply: `npm run build`, `npm run lint`, and `npm run test:run`.
-- If backend code changes, run the relevant RSpec command; for broad backend
-  changes, run `bundle exec rspec`.
-- If a verification command cannot be run or fails, report the exact command and failure.
-
-## Completion criteria
-
-A task is complete only when:
-
-- implementation is complete,
-- relevant verification commands pass, or failures are clearly explained,
-- unrelated files are not changed,
-- migrations and schema are consistent when schema changes are made,
-- user-facing behavior is documented when needed.

backend/AGENTS.md

@@ -1,212 +0,0 @@
-# backend/AGENTS.md
-
-## Scope
-
-These rules apply to work under `backend/`.
-
-This is a Rails API app using Active Record, RSpec, request specs,
-service objects, representation classes, and version tables for post/tag/wiki
-history.
-
-## Commands
-
-Use commands backed by files and dependencies in this directory:
-
-```sh
-bin/setup
-bin/dev
-bin/rails
-bin/rake
-bin/rubocop
-bin/brakeman
-bundle exec rspec
-```
-
-Common checks:
-
-```sh
-bundle exec rspec
-bin/rubocop
-bin/brakeman
-```
-
-Common Rails commands:
-
-```sh
-bin/rails db:prepare
-bin/rails db:migrate
-bin/rails routes
-bin/rails server
-```
-
-After backend behavior changes, run the relevant RSpec files. For broad backend changes, run:
-
-```sh
-bundle exec rspec
-```
-
-If a command cannot be run or fails, report the exact command and failure.
-
-## Rails structure
-
-- `app/controllers`: API controllers.
-- `app/models`: Active Record models and concerns.
-- `app/representations`: JSON response shaping.
-- `app/services`: domain services such as version recorders, wiki commit,
-  YouTube sync, and similarity calculation.
-- `config/routes.rb`: public API routes.
-- `db/migrate`: migrations.
-- `db/schema.rb`: schema snapshot.
-- `lib/tasks`: custom Rake tasks.
-- `spec`: RSpec tests.
-
-Before changing behavior, inspect the matching route, controller, model,
-service, representation, and spec.
-
-## Ruby style
-
-- Prefer precise, minimal changes.
-- Use single quotes unless interpolation or escaping makes double quotes better.
-- Do not put a space before Ruby method-call parentheses.
-- Never put a line break immediately before `)` in Ruby.
-- Do not use `%w` or `%i` in new Ruby code.
-- Never write a Ruby line longer than 99 characters.
-- Aim to keep Ruby lines within 79 characters where practical.
-- For small Ruby method definitions that take keyword arguments, match the
-  local no-parentheses style when nearby code uses it.
-- Treat Ruby hash `{ ... }` style and Ruby block `{ ... }` style as separate
-  rules.
-- Do not format Ruby hashes like Ruby blocks.
-- For Ruby hashes, keep the closing `}` on the same line as the final pair.
-- Keep the first pair on the same line as `{` by default.
-- If the hash would exceed the line limit, break after `{` and indent pairs
-  by 4 spaces.
-- Put one logical pair per line when the expression would otherwise become
-  dense.
-- For Ruby arrays, never put whitespace or a line break immediately before `]`.
-- Keep the first element on the same line as `[` by default.
-- If an array would exceed the line limit, break after `[` and indent
-  elements by 4 spaces.
-- For Ruby blocks, use 2-space indentation for the block body.
-- Keep comments short and useful; avoid narrating obvious code.
-- Do not add production dependencies without approval.
-
-## Authentication and authorization
-
-- Authentication is handled through the `X-Transfer-Code` header in
-  `ApplicationController#authenticate_user`.
-- `current_user` is set by looking up `User.inheritance_code`.
-- Do not bypass or weaken the `X-Transfer-Code` flow unless the task
-  explicitly changes authentication.
-- Unauthenticated write actions should return `:unauthorized` consistently
-  with existing controllers.
-- Role checks use `User` enum roles: `guest`, `member`, and `admin`.
-- Use `current_user.gte_member?` for member-or-admin write permissions where
-  existing controllers do so.
-- Use `current_user.admin?` only for admin-only paths, such as tag child relationship changes.
-- Do not replace role checks with looser presence checks.
-
-## BAN and IP BAN
-
-- `ApplicationController` runs these before actions in order:
-  - `reject_banned_ip_address!`
-  - `authenticate_user`
-  - `reject_banned_user!`
-- User and IP bans use `banned_at`, not a boolean `banned` column.
-- `User#banned?` and `IpAddress#banned?` check `banned_at.present?`.
-- Do not weaken BAN or IP BAN behavior.
-- If changing request authentication or controller before actions, add or
-  update request specs covering banned users and banned IP addresses.
-
-## RSpec
-
-- Prefer RSpec for new backend tests.
-- Put API behavior coverage under `spec/requests`.
-- Put model behavior under `spec/models`.
-- Put service behavior under `spec/services`.
-- Put Rake task coverage under `spec/tasks`.
-- `spec/rails_helper.rb` loads `spec/support/**/*.rb`.
-- Request specs include `AuthHelper` and `JsonHelper`.
-- `AuthHelper#sign_in_as(user)` stubs
-  `ApplicationController#current_user`; use it when matching existing
-  request spec style.
-- Add or update request specs for API behavior changes, especially status
-  codes, permissions, response shape, and version conflict behavior.
-
-## Migrations
-
-- Keep migrations and `db/schema.rb` consistent.
-- Use reversible migrations where practical; otherwise define explicit `up` and `down`.
-- For data backfills inside migrations, follow the existing pattern of
-  defining migration-local `ActiveRecord::Base` classes with
-  `self.table_name`.
-- Preserve existing indexes, foreign keys, check constraints, and null constraints.
-- Be careful with MySQL-specific options already present in migrations, such as `after:`.
-- Do not edit old migrations just to change current behavior unless
-  explicitly requested; add a new migration.
-
-## Version tables
-
-- Versioned records include posts, tags, nico tags, and wiki pages.
-- Current records have `version_no`; version tables have positive
-  `version_no` with unique indexes scoped to the parent record.
-- Version event types are `create`, `update`, `discard`, and `restore`.
-- Version rows are readonly through the `VersionRecord` concern.
-- Use the existing recorder services instead of manually inserting version
-  rows in application code:
-  - `PostVersionRecorder`
-  - `TagVersionRecorder`
-  - `NicoTagVersionRecorder`
-  - `WikiVersionRecorder`
-  - `TagVersioning`
-- `VersionRecorder` locks the current record, validates sequence consistency,
-  skips unchanged update snapshots, creates the next version row, and updates
-  the record `version_no`.
-- Do not update versioned records without considering whether a version snapshot must be created.
-- For optimistic concurrency paths, preserve `base_version_no`, `force`, and
-  `merge` semantics and cover conflicts in request specs.
-
-## Domain cautions
-
-- Posts have tag snapshots, parent post implications, original-created ranges,
-  viewed state, and version conflict behavior.
-- Tags have canonical names, aliases through `TagName`, categories, parent
-  implications, discard behavior, and version snapshots.
-- Nico tags have separate relation/version behavior; do not treat them like
-  normal editable tags without checking existing code.
-- Wiki pages involve page content, revisions/history, version rows,
-  title/tag-name behavior, and diff/restore paths.
-- Materials, theatres, and comments have user and permission checks; inspect
-  the controller before changing them.
-
-## API responses
-
-- Use representation classes under `app/representations` when existing endpoints do.
-- Keep response keys consistent with existing JSON contracts.
-- Frontend code expects camelCase conversion client-side, while Rails params
-  and JSON keys are generally snake_case.
-- Preserve existing HTTP status conventions:
-  `:unauthorized` for no user, `:forbidden` for insufficient role or banned
-  user, `:not_found` for missing records, and `:unprocessable_entity` for
-  validation failures.
-- For diagnostic or internal helper JSON, prefer a deliberately light response
-  shape over full representation classes when callers only need identifiers,
-  labels, URLs, or weights.
-
-## Active Record performance
-
-- When a controller action serializes nested associations, preload the
-  associations it will touch instead of allowing N+1 queries.
-- Be sensitive to N+1 queries in all backend work.
-- Avoid introducing N+1 queries, and proactively fix existing N+1 issues when
-  you find them in the code path you are editing.
-- When an association may already be preloaded, prefer loaded-association
-  checks that reuse the preloaded data without losing the efficient database
-  path.
-
-## Files to avoid in routine work
-
-- Do not inspect or edit `tmp/`, `log/`, `storage/`, `vendor/`, or dependency
-  directories unless explicitly needed.
-- Do not modify generated schema or migration output without the corresponding
-  migration when schema changes are made.

backend/Gemfile

@@ -69,5 +69,3 @@ gem 'discard'
 gem "rspec-rails", "~> 8.0", :groups => [:development, :test]
 
 gem 'aws-sdk-s3', require: false
-
-gem 'rails-i18n', '~> 8.0.0'

backend/Gemfile.lock

@@ -306,9 +306,6 @@ GEM
     rails-html-sanitizer (1.6.2)
       loofah (~> 2.21)
       nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
-    rails-i18n (8.0.2)
-      i18n (>= 0.7, < 2)
-      railties (>= 8.0.0, < 9)
     railties (8.0.2)
       actionpack (= 8.0.2)
       activesupport (= 8.0.2)
@@ -480,7 +477,6 @@ DEPENDENCIES
   puma (>= 5.0)
   rack-cors
   rails (~> 8.0.2)
-  rails-i18n (~> 8.0.0)
   rspec-rails (~> 8.0)
   rubocop-rails-omakase
   sprockets-rails

backend/app/controllers/application_controller.rb

@@ -1,19 +1,14 @@
 class ApplicationController < ActionController::API
-  rescue_from ActiveRecord::RecordInvalid, with: :render_record_invalid
-  rescue_from ActiveRecord::RecordNotUnique, with: :render_record_not_unique
-
-  before_action :reject_banned_ip_address!
   before_action :authenticate_user
-  before_action :reject_banned_user!
 
-  def current_user = @current_user
+  def current_user
+    @current_user
+  end
 
   private
 
   def authenticate_user
     code = request.headers['X-Transfer-Code'] || request.headers['HTTP_X_TRANSFER_CODE']
-    return if code.blank?
-
     @current_user = User.find_by(inheritance_code: code)
   end
 
@@ -27,62 +22,4 @@ class ApplicationController < ActionController::API
       s.in?(['', '1', 'true', 'on', 'yes'])
     end
   end
-
-  def render_bad_request message = 'リクエストが不正です．'
-    render json: { type: 'bad_request',
-                   message:,
-                   errors: { },
-                   base_errors: [message] },
-           status: :bad_request
-  end
-
-  def render_unprocessable_entity message = '入力を確認してください．', field: nil
-    render_validation_error(fields: field ? { field => [message] } : { },
-                            base: field ? [] : [message])
-  end
-
-  def render_record_invalid error
-    render_validation_error error.record
-  end
-
-  def render_record_not_unique _error = nil
-    render_validation_error base: ['すでに存在してゐます．']
-  end
-
-  def reject_banned_ip_address!
-    ip_address = IpAddress.find_by(ip_address: IPAddr.new(request.remote_ip).hton)
-    return unless ip_address&.banned?
-
-    head :forbidden
-  end
-
-  def reject_banned_user!
-    return unless current_user&.banned?
-
-    head :forbidden
-  end
-
-  def render_validation_error record = nil, fields: { }, base: [], status: :unprocessable_entity
-    errors = { }
-
-    if record
-      record.errors.each do |error|
-        errors[error.attribute] ||= []
-        errors[error.attribute] << error.message
-      end
-    end
-
-    fields.each do |attr, messages|
-      errors[attr.to_sym] ||= []
-      errors[attr.to_sym].concat(Array(messages))
-    end
-
-    base_errors = Array(base) + Array(errors.delete(:base))
-
-    render json: { type: 'validation_error',
-                   message: '入力内容を確認してください．',
-                   errors:,
-                   base_errors: },
-           status:
-  end
 end

backend/app/controllers/deerjikists_controller.rb

@@ -2,8 +2,7 @@ class DeerjikistsController < ApplicationController
   def show
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
+    return head :bad_request if platform.blank? || code.blank?
 
     deerjikist = Deerjikist
                  .joins(:tag)
@@ -23,9 +22,7 @@ class DeerjikistsController < ApplicationController
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
     tag_id = params[:tag_id].to_i
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
-    return render_bad_request('tag_id が不正です．') if tag_id <= 0
+    return head :bad_request if platform.blank? || code.blank? || tag_id <= 0
 
     deerjikist = Deerjikist.find_or_initialize_by(platform:, code:).tap do |d|
       d.tag_id = tag_id
@@ -41,8 +38,7 @@ class DeerjikistsController < ApplicationController
 
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
+    return head :bad_request if platform.blank? || code.blank?
 
     Deerjikist.find([platform, code]).destroy!
 

backend/app/controllers/materials_controller.rb

@@ -40,11 +40,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank?
-      return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
-                                               url: ['ファイルまたは URL は必須です．'] }
-    end
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -58,7 +54,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
-      render_validation_error material
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 
@@ -72,11 +68,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank?
-      return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
-                                               url: ['ファイルまたは URL は必須です．'] }
-    end
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -92,7 +84,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url)
     else
-      render_validation_error material
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 

backend/app/controllers/nico_tags_controller.rb

@@ -1,69 +1,26 @@
 class NicoTagsController < ApplicationController
   def index
-    name = params[:name].presence
-    linked_tag = params[:linked_tag].presence
-    link_status = params[:link_status].presence
-    order = params[:order].to_s.split(':', 2).map(&:strip)
-    order[0] = 'updated_at' unless order[0].in?(['name', 'created_at', 'updated_at'])
-    unless order[1].in?(['asc', 'desc'])
-      order[1] = order[0] == 'name' ? 'asc' : 'desc'
-    end
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    post_tag_max_sql =
-        PostTag
-        .select('tag_id, MAX(created_at) AS max_created_at')
-        .group('tag_id')
-        .to_sql
+    limit = (params[:limit] || 20).to_i
+    cursor = params[:cursor].presence
 
     q = Tag.nico_tags
-           .joins(:tag_name)
-           .joins("LEFT JOIN (#{ post_tag_max_sql }) post_tag_max " \
-                  'ON post_tag_max.tag_id = tags.id')
            .includes(:tag_name, tag_name: :wiki_page, linked_tags: { tag_name: :wiki_page })
-    q = q.where('tag_names.name LIKE ?', "%#{ name }%") if name
-    if linked_tag
-      linked_tag_ids =
-        Tag
-        .joins(:tag_name)
-        .where('tag_names.name LIKE ?', "%#{ linked_tag }%")
-        .pluck(:id)
-      linked_nico_tag_ids = NicoTagRelation.where(tag_id: linked_tag_ids).pluck(:nico_tag_id)
-      q = q.where(id: linked_nico_tag_ids)
-    end
-    if link_status.in?(['linked', 'unlinked'])
-      exists_sql =
-          'EXISTS (SELECT 1 FROM nico_tag_relations ' \
-          'WHERE nico_tag_relations.nico_tag_id = tags.id)'
-      q = link_status == 'linked' ? q.where(exists_sql) : q.where("NOT #{ exists_sql }")
-    end
+           .order(updated_at: :desc)
+    q = q.where('tags.updated_at < ?', Time.iso8601(cursor)) if cursor
 
-    count = q.count
-    sort_sql =
-        case order[0]
-        when 'name'
-          'tag_names.name'
-        when 'updated_at'
-          'post_tag_max.max_created_at'
-        else
-          "tags.#{ order[0] }"
-        end
-    tags = q.reselect('tags.*',
-                      Arel.sql('post_tag_max.max_created_at AS recent_post_tag_created_at'))
-            .order(Arel.sql("#{ sort_sql } #{ order[1] }, tags.id #{ order[1] }"))
-            .limit(limit)
-            .offset((page - 1) * limit)
-            .to_a
+    tags = q.limit(limit + 1).to_a
+
+    next_cursor = nil
+    if tags.size > limit
+      next_cursor = tags.last.updated_at.iso8601(6)
+      tags = tags.first(limit)
+    end
 
     render json: { tags: tags.map { |tag|
-      TagRepr.base(tag).merge(
-          recent_post_tag_created_at: tag.recent_post_tag_created_at,
-          linked_tags: tag.linked_tags.map { |lt| TagRepr.base(lt) })
-    }, count: }
+      TagRepr.base(tag).merge(linked_tags: tag.linked_tags.map { |lt|
+        TagRepr.base(lt)
+      })
+    }, next_cursor: }
   end
 
   def update
@@ -73,42 +30,16 @@ class NicoTagsController < ApplicationController
     id = params[:id].to_i
 
     tag = Tag.find(id)
-    return render_bad_request('ニコニコ・タグを指定してください．') unless tag.nico?
+    return head :bad_request if tag.category != 'nico'
 
-    linked_tag_names = params[:tags].to_s.split
-    linked_tags = nil
+    linked_tag_names = params[:tags].to_s.split(' ')
+    linked_tags = Tag.normalise_tags(linked_tag_names, with_tagme: false,
+                                                       with_no_deerjikist: false)
+    return head :bad_request if linked_tags.any? { |t| t.category == 'nico' }
 
-    ApplicationRecord.transaction do
-      linked_tags = Tag.normalise_tags!(linked_tag_names, with_tagme: false,
-                                                          with_no_deerjikist: false)
-      if linked_tags.any? { |t| t.nico? }
-        raise Tag::NicoTagNormalisationError
-      end
-
-      TagVersioning.record_tag_snapshots!(linked_tags, created_by_user: current_user)
-
-      tag.linked_tags = linked_tags
-      tag.save!
-
-      NicoTagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
-    end
+    tag.linked_tags = linked_tags
+    tag.save!
 
     render json: tag.linked_tags.map { |t| TagRepr.base(t) }, status: :ok
-  rescue Tag::NicoTagNormalisationError
-    render_validation_error fields: { tags: ['ニコニコ・タグ同士は連携できません．'] }
-  rescue ActiveRecord::RecordInvalid => e
-    render_nico_tag_form_record_invalid e.record
-  end
-
-  private
-
-  def render_nico_tag_form_record_invalid record
-    if record.is_a?(TagName) || record.is_a?(Tag)
-      render_validation_error fields: { tags: record.errors.full_messages.map { |message|
-        "タグ名 “#{ record.name }”: #{ message }"
-      } }
-    else
-      render_validation_error record
-    end
   end
 end

backend/app/controllers/posts_controller.rb

@@ -44,8 +44,7 @@ class PostsController < ApplicationController
         filtered_posts
         .joins("LEFT JOIN (#{ pt_max_sql }) pt_max ON pt_max.post_id = posts.id")
         .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
-        .preload(:uploaded_user, :parents, :children,
-                 tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+        .preload(tags: [:materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -96,9 +95,7 @@ class PostsController < ApplicationController
   end
 
   def random
-    post = filtered_posts.preload(:uploaded_user, :parents, :children,
-                                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                         .with_attached_thumbnail
+    post = filtered_posts.preload(tags: [:materials, { tag_name: :wiki_page }])
                          .order('RAND()')
                          .first
     return head :not_found unless post
@@ -107,25 +104,12 @@ class PostsController < ApplicationController
   end
 
   def show
-    post =
-        Post
-        .includes(:uploaded_user, :parents, :children,
-                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-        .with_attached_thumbnail
-        .find_by(id: params[:id])
+    post = Post.includes(tags: [:materials, { tag_name: :wiki_page }]).find_by(id: params[:id])
     return head :not_found unless post
 
-    parent_posts = post.parents.with_attached_thumbnail.order(:id).to_a
-    child_posts = post.children.with_attached_thumbnail.order(:id).to_a
-    sibling_posts = sibling_posts_by_parent(parent_posts.map(&:id))
-    related = post.related(limit: 20).to_a
-
-    render json: PostRepr.detail(post, current_user,
-                                 parent_posts:,
-                                 child_posts:,
-                                 sibling_posts:,
-                                 related:)
-                         .merge(tags: build_tag_tree_for(post.tags))
+    render json: PostRepr.base(post, current_user)
+                         .merge(tags: build_tag_tree_for(post.tags),
+                                related: post.related(limit: 20))
   end
 
   def create
@@ -139,36 +123,26 @@ class PostsController < ApplicationController
     tag_names = params[:tags].to_s.split
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
-    parent_post_ids = parse_parent_post_ids
 
     post = Post.new(title:, url:, thumbnail_base: nil, uploaded_user: current_user,
                     original_created_from:, original_created_before:)
-    post.thumbnail.attach(thumbnail) if thumbnail.present?
+    post.thumbnail.attach(thumbnail)
 
-    ApplicationRecord.transaction do
+    ActiveRecord::Base.transaction do
       post.save!
-
-      tags = Tag.normalise_tags!(tag_names)
-      TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)
-
+      tags = Tag.normalise_tags(tag_names)
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
-
-      sync_parent_posts!(post, parent_post_ids)
-
       post.resized_thumbnail!
-
       PostVersionRecorder.record!(post:, event_type: :create, created_by_user: current_user)
     end
 
     post.reload
     render json: PostRepr.base(post), status: :created
+  rescue ActiveRecord::RecordInvalid
+    render json: { errors: post.errors.full_messages }, status: :unprocessable_entity
   rescue Tag::NicoTagNormalisationError
-    render_validation_error fields: { tags: 'ニコニコ・タグは直接指定できません．' }
-  rescue ArgumentError => e
-    render_validation_error fields: { parent_post_ids: [e.message] }
-  rescue ActiveRecord::RecordInvalid => e
-    render_post_form_record_invalid e.record
+    head :bad_request
   end
 
   def viewed
@@ -189,76 +163,30 @@ class PostsController < ApplicationController
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
 
-    force = bool?(:force)
-    merge = bool?(:merge)
-    return render_bad_request('force と merge は同時に指定できません．') if force && merge
-
-    base_version_no = parse_base_version_no
-    return render_bad_request('base_version_no は必須です．') if !(force) && !(base_version_no)
-
     title = params[:title].presence
     tag_names = params[:tags].to_s.split
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
-    parent_post_ids = parse_parent_post_ids
 
-    post = nil
-    conflict_json = nil
+    post = Post.find(params[:id].to_i)
 
-    ApplicationRecord.transaction do
-      post = Post.lock.find(params[:id].to_i)
-
-      base_version = nil
-      base_snapshot = nil
-      current_snapshot = nil
-      unless force
-        base_version = post.post_versions.find_by!(version_no: base_version_no)
-
-        base_snapshot = post_snapshot_from_version(base_version)
-        current_snapshot = post_snapshot_from_record(post)
-      end
-      incoming_snapshot = post_incoming_snapshot(title:,
-                                                 original_created_from:,
-                                                 original_created_before:,
-                                                 tag_names:,
-                                                 parent_post_ids:)
-
-      snapshot_to_apply =
-          if force || post.version_no == base_version_no || current_snapshot == base_snapshot
-            incoming_snapshot
-          else
-            changes = post_snapshot_changes(base_snapshot, current_snapshot, incoming_snapshot)
-            conflicts = changes.select { |change| change[:conflict] }
-
-            if merge && conflicts.empty?
-              merge_post_snapshots(base_snapshot, current_snapshot, incoming_snapshot)
-            else
-              conflict_json = post_conflict_json(post:,
-                                                 base_version_no:,
-                                                 base_snapshot:,
-                                                 current_snapshot:,
-                                                 incoming_snapshot:,
-                                                 changes:,
-                                                 conflicts:)
-              raise ActiveRecord::Rollback
-            end
-          end
-
-      apply_post_snapshot!(post, snapshot_to_apply)
+    ActiveRecord::Base.transaction do
+      post.update!(title:, original_created_from:, original_created_before:)
+      tags = post.tags.where(category: 'nico').to_a +
+             Tag.normalise_tags(tag_names, with_tagme: false)
+      tags = Tag.expand_parent_tags(tags)
+      sync_post_tags!(post, tags)
+      PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)
     end
 
-    return render json: conflict_json, status: :conflict if conflict_json
-
     post.reload
-    json = PostRepr.base(post, current_user)
+    json = post.as_json
     json['tags'] = build_tag_tree_for(post.tags)
     render json:, status: :ok
+  rescue ActiveRecord::RecordInvalid
+    render json: post.errors, status: :unprocessable_entity
   rescue Tag::NicoTagNormalisationError
-    render_validation_error fields: { tags: ['ニコニコ・タグは直接指定できません．'] }
-  rescue ArgumentError => e
-    render_validation_error fields: { parent_post_ids: [e.message] }
-  rescue ActiveRecord::RecordInvalid => e
-    render_post_form_record_invalid e.record
+    head :bad_request
   end
 
   def changes
@@ -276,7 +204,7 @@ class PostsController < ApplicationController
     pts = pts.where(post_id: id) if id.present?
     pts = pts.where(tag_id:) if tag_id.present?
     pts = pts.includes(:post, :created_user, :deleted_user,
-                       tag: [:deerjikists, :materials, { tag_name: :wiki_page }])
+                       tag: [:materials, { tag_name: :wiki_page }])
 
     events = []
     pts.each do |pt|
@@ -401,7 +329,7 @@ class PostsController < ApplicationController
       return nil unless tag
 
       if path.include?(tag_id)
-        return TagRepr.inline(tag).merge(children: [])
+        return TagRepr.base(tag).merge(children: [])
       end
 
       if memo.key?(tag_id)
@@ -413,272 +341,9 @@ class PostsController < ApplicationController
 
       children = child_ids.filter_map { |cid| build_node.(cid, new_path) }
 
-      memo[tag_id] = TagRepr.inline(tag).merge(children:)
+      memo[tag_id] = TagRepr.base(tag).merge(children:)
     end
 
     root_ids.filter_map { |id| build_node.call(id, []) }
   end
-
-  def sibling_posts_by_parent parent_post_ids
-    return { } if parent_post_ids.blank?
-
-    implications =
-        PostImplication
-        .where(parent_post_id: parent_post_ids)
-        .includes(post: { thumbnail_attachment: :blob })
-        .order(:parent_post_id, :post_id)
-
-    implications.group_by(&:parent_post_id).transform_values { |items|
-      items.map(&:post)
-    }
-  end
-
-  def parse_parent_post_ids
-    raise ArgumentError, 'parent_post_ids は必須です．' unless params.key?(:parent_post_ids)
-
-    params[:parent_post_ids].to_s.split.map { |token|
-      id = Integer(token, exception: false)
-      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if id.nil? || id <= 0
-
-      id
-    }.uniq
-  end
-
-  def sync_parent_posts! post, parent_post_ids
-    if parent_post_ids.include?(post.id)
-      post.errors.add :parent_post_ids, '自分自身を親投稿にはできません．'
-      raise ActiveRecord::RecordInvalid, post
-    end
-
-    existing_ids = Post.where(id: parent_post_ids).pluck(:id)
-    missing_ids = parent_post_ids - existing_ids
-
-    if missing_ids.present?
-      post.errors.add :parent_post_ids,
-                      "存在しない親投稿 Id. があります: #{ missing_ids.join(' ') }"
-      raise ActiveRecord::RecordInvalid, post
-    end
-
-    current_ids = post.parent_posts.pluck(:id)
-
-    ids_to_add = parent_post_ids - current_ids
-    ids_to_remove = current_ids - parent_post_ids
-
-    PostImplication.where(post_id: post.id, parent_post_id: ids_to_remove).delete_all
-
-    ids_to_add.each do |parent_post_id|
-      PostImplication.create_or_find_by!(post_id: post.id, parent_post_id:)
-    end
-  end
-
-  def parse_base_version_no
-    version_no = Integer(params[:base_version_no], exception: false)
-    if version_no&.positive?
-      version_no
-    else
-      nil
-    end
-  end
-
-  def post_snapshot_from_version version
-    { title: version.title,
-      original_created_from: snapshot_time(version.original_created_from),
-      original_created_before: snapshot_time(version.original_created_before),
-      tag_names: editable_tag_names_from_version(version),
-      parent_post_ids: snapshot_parent_post_ids_from_version(version) }
-  end
-
-  def editable_tag_names_from_version version
-    version.tags.to_s.split.reject { |name| name.downcase.start_with?('nico:') }.sort
-  end
-
-  def post_snapshot_from_record post
-    { title: post.title,
-      original_created_from: snapshot_time(post.original_created_from),
-      original_created_before: snapshot_time(post.original_created_before),
-      tag_names: editable_tag_names_from_post(post),
-      parent_post_ids: post.parent_posts.order(:id).pluck(:id) }
-  end
-
-  def editable_tag_names_from_post post
-    post.tags.not_nico.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-  end
-
-  def post_incoming_snapshot title:, original_created_from:, original_created_before:,
-                             tag_names:, parent_post_ids:
-    { title:,
-      original_created_from: snapshot_time(original_created_from),
-      original_created_before: snapshot_time(original_created_before),
-      tag_names: incoming_tag_names_for_snapshot(tag_names),
-      parent_post_ids: parent_post_ids.sort }
-  end
-
-  def snapshot_parent_post_ids_from_version version
-    if version.respond_to?(:parent_post_ids)
-      version.parent_post_ids.to_s.split.map { |id| id.to_i }.sort
-    elsif version.respond_to?(:parent_id) && version.parent_id
-      [version.parent_id]
-    else
-      []
-    end
-  end
-
-  def snapshot_time value
-    return nil if value.blank?
-
-    value = Time.zone.parse(value.to_s) if value in String
-    value&.in_time_zone&.iso8601(6)
-  rescue ArgumentError, TypeError
-    value.to_s
-  end
-
-  def incoming_tag_names_for_snapshot raw_tag_names
-    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false)
-
-    Tag.expand_parent_tags(tags).map(&:name).uniq.sort
-  end
-
-  def post_conflict_json post:, base_version_no:, base_snapshot:,
-                         current_snapshot:, incoming_snapshot:, changes:, conflicts:
-    { error: 'conflict',
-      message: '競合が発生しました．',
-      post_id: post.id,
-      base_version_no:,
-      current_version_no: post.version_no,
-      base: base_snapshot,
-      current: current_snapshot,
-      mine: incoming_snapshot,
-      changes:,
-      conflicts:,
-      mergeable: conflicts.empty? }
-  end
-
-  def post_snapshot_changes base_snapshot, current_snapshot, incoming_snapshot
-    [scalar_snapshot_change(:title, 'タイトル',
-                            base_snapshot, current_snapshot, incoming_snapshot),
-     scalar_snapshot_change(:original_created_from, 'オリジナルの作成日時（以降）',
-                            base_snapshot, current_snapshot, incoming_snapshot),
-     scalar_snapshot_change(:original_created_before, 'オリジナルの作成日時（より前）',
-                            base_snapshot, current_snapshot, incoming_snapshot),
-     set_snapshot_change(:tag_names, 'タグ',
-                         base_snapshot, current_snapshot, incoming_snapshot),
-     set_snapshot_change(:parent_post_ids, '親投稿',
-                         base_snapshot, current_snapshot, incoming_snapshot)].compact
-  end
-
-  def scalar_snapshot_change field, label, base_snapshot, current_snapshot, incoming_snapshot
-    base = base_snapshot[field]
-    current = current_snapshot[field]
-    mine = incoming_snapshot[field]
-
-    return nil if current == base && mine == base
-
-    { field:, label:, base:, current:, mine:,
-      changed_by_current: current != base,
-      changed_by_me: mine != base,
-      conflict: scalar_snapshot_conflict?(base, current, mine) }
-  end
-
-  def scalar_snapshot_conflict? base, current, mine
-    current != base && mine != base && current != mine
-  end
-
-  def set_snapshot_change field, label, base_snapshot, current_snapshot, incoming_snapshot
-    base = base_snapshot[field].to_a
-    current = current_snapshot[field].to_a
-    mine = incoming_snapshot[field].to_a
-
-    added_by_current = current - base
-    removed_by_current = base - current
-    added_by_me = mine - base
-    removed_by_me = base - mine
-
-    if (added_by_current.empty? &&
-        removed_by_current.empty? &&
-        added_by_me.empty? &&
-        removed_by_me.empty?)
-      return nil
-    end
-
-    { field:, label:, base:, current:, mine:, added_by_current:, removed_by_current:,
-      added_by_me:, removed_by_me:,
-      changed_by_current: added_by_current.present? || removed_by_current.present?,
-      changed_by_me: added_by_me.present? || removed_by_me.present?,
-      conflict: set_snapshot_conflict?(added_by_current:,
-                                       removed_by_current:,
-                                       added_by_me:,
-                                       removed_by_me:) }
-  end
-
-  def set_snapshot_conflict? added_by_current:, removed_by_current:,
-                             added_by_me:, removed_by_me:
-    (added_by_current & removed_by_me).present? || (removed_by_current & added_by_me).present?
-  end
-
-  def apply_post_snapshot! post, snapshot
-    PostVersionRecorder.ensure_snapshot!(post, created_by_user: current_user)
-
-    post.update!(title: snapshot[:title],
-                 original_created_from: snapshot[:original_created_from],
-                 original_created_before: snapshot[:original_created_before])
-
-    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false)
-    TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)
-
-    readonly_tags = post.tags.nico.to_a
-
-    tags = readonly_tags + editable_tags
-    tags = Tag.expand_parent_tags(tags)
-
-    sync_post_tags!(post, tags)
-    sync_parent_posts!(post, snapshot[:parent_post_ids])
-
-    PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)
-  end
-
-  def merge_post_snapshots base_snapshot, current_snapshot, incoming_snapshot
-    [:title, :original_created_from, :original_created_before].map {
-      [_1, merge_scalar_snapshot_value(base_snapshot[_1],
-                                       current_snapshot[_1],
-                                       incoming_snapshot[_1])]
-    }.to_h.merge([:tag_names, :parent_post_ids].map {
-      [_1, merge_set_snapshot_value(base_snapshot[_1],
-                                    current_snapshot[_1],
-                                    incoming_snapshot[_1])]
-    }.to_h)
-  end
-
-  def merge_scalar_snapshot_value base, current, mine
-    return mine if current == base
-    return current if mine == base || current == mine
-
-    raise ArgumentError, '競合してゐる項目はマージできません．'
-  end
-
-  def merge_set_snapshot_value base, current, mine
-    base = base.to_a
-    current = current.to_a
-    mine = mine.to_a
-
-    added_by_current = current - base
-    removed_by_current = base - current
-    added_by_me = mine - base
-    removed_by_me = base - mine
-
-    merged = base + added_by_current + added_by_me
-    merged -= removed_by_current
-    merged -= removed_by_me
-
-    merged.uniq.sort
-  end
-
-  def render_post_form_record_invalid record
-    if record.is_a?(TagName) || record.is_a?(Tag)
-      render_validation_error fields: { tags: record.errors.full_messages.map { |message|
-        "タグ名 “#{ record.name }”: #{ message }"
-      } }
-    else
-      render_validation_error record
-    end
-  end
 end

backend/app/controllers/preview_controller.rb

@@ -4,7 +4,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．') unless url.present?
+    return head :bad_request unless url.present?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -16,7 +16,7 @@ class PreviewController < ApplicationController
 
     render json: { title: title }
   rescue => e
-    render_bad_request(e.message)
+    render json: { error: e.message }, status: :bad_request
   end
 
   def thumbnail
@@ -25,7 +25,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．') if url.blank?
+    return head :bad_request if url.blank?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -40,11 +40,7 @@ class PreviewController < ApplicationController
       File.delete(path) rescue nil
       send_file image.path, type: 'image/png', disposition: 'inline'
     else
-      render json: { type: 'internal_server_error',
-                     message: 'サムネールを生成できませんでした．',
-                     errors: { },
-                     base_errors: ['サムネールを生成できませんでした．'] },
-             status: :internal_server_error
+      render json: { error: 'Failed to generate thumbnail' }, status: :internal_server_error
     end
   end
 end

backend/app/controllers/tag_children_controller.rb

@@ -5,19 +5,9 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．') if parent_id.blank?
-    return render_bad_request('child_id は必須です．') if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
 
-    parent = Tag.find(parent_id)
-    child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
-
-      TagImplication.find_or_create_by!(parent_tag: parent, tag: child)
-      TagVersionRecorder.record!(tag: child, event_type: :update, created_by_user: current_user)
-    end
+    Tag.find(parent_id).children << Tag.find(child_id) rescue nil
 
     head :no_content
   end
@@ -28,19 +18,9 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．') if parent_id.blank?
-    return render_bad_request('child_id は必須です．') if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
 
-    parent = Tag.find(parent_id)
-    child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
-
-      TagImplication.find_by(parent_tag: parent, tag: child)&.destroy!
-      TagVersionRecorder.record!(tag: child, event_type: :update, created_by_user: current_user)
-    end
+    Tag.find(parent_id).children.delete(Tag.find(child_id)) rescue nil
 
     head :no_content
   end

backend/app/controllers/tag_versions_controller.rb

@@ -1,92 +0,0 @@
-class TagVersionsController < ApplicationController
-  def index
-    tag_id = params[:id].presence
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    q = TagVersion.joins(<<~SQL.squish)
-          LEFT JOIN
-            tag_versions prev
-            ON
-              prev.tag_id = tag_versions.tag_id
-              AND prev.version_no = tag_versions.version_no - 1
-        SQL
-      .select('tag_versions.*', 'prev.name AS prev_name', 'prev.category AS prev_category',
-              'prev.aliases AS prev_aliases', 'prev.parent_tag_ids AS prev_parent_tag_ids')
-    q = q.where('tag_versions.tag_id = ?', tag_id) if tag_id
-
-    count = q.except(:select, :order, :limit, :offset).count
-
-    versions = q.order(Arel.sql('tag_versions.created_at DESC, tag_versions.id DESC'))
-                .limit(limit)
-                .offset(offset)
-
-    render json: { versions: serialise_versions(versions), count: }
-  end
-
-  private
-
-  def serialise_versions rows
-    user_ids = rows.map(&:created_by_user_id).compact.uniq
-    users_by_id = User.where(id: user_ids).pluck(:id, :name).to_h
-
-    rows.map do |row|
-      cur_aliases = split_values(row.aliases)
-      prev_aliases = split_values(row.attributes['prev_aliases'])
-
-      cur_parent_tag_ids = split_parent_tag_ids(row.parent_tag_ids)
-      prev_parent_tag_ids = split_parent_tag_ids(row.attributes['prev_parent_tag_ids'])
-
-      all_parent_tag_ids = (cur_parent_tag_ids | prev_parent_tag_ids)
-
-      tags_by_id =
-          Tag
-          .includes(:tag_name, :materials, { tag_name: :wiki_page })
-          .where(id: all_parent_tag_ids)
-          .index_by(&:id)
-
-      parent_tags =
-          build_version_values(cur_parent_tag_ids, prev_parent_tag_ids, key: :tag_id)
-          .map do |h|
-            { tag: TagRepr.base(tags_by_id[h[:tag_id]]),
-              type: h[:type] }
-          end
-
-      { tag_id: row.tag_id,
-        version_no: row.version_no,
-        event_type: row.event_type,
-        name: { current: row.name, prev: row.attributes['prev_name'] },
-        category: { current: row.category, prev: row.attributes['prev_category'] },
-        aliases: build_version_values(cur_aliases, prev_aliases, key: :name),
-        parent_tags:,
-        created_at: row.created_at.iso8601,
-        created_by_user: row.created_by_user_id &&
-                         { id: row.created_by_user_id,
-                           name: users_by_id[row.created_by_user_id] } }
-    end
-  end
-
-  def build_version_values cur_values, prev_values, key:
-    (cur_values | prev_values).map do |value|
-      type =
-          if cur_values.include?(value) && prev_values.include?(value)
-            'context'
-          elsif cur_values.include?(value)
-            'added'
-          else
-            'removed'
-          end
-
-      { key => value, type: }
-    end
-  end
-
-  def split_values(values) = values.to_s.split(/\s+/).reject(&:blank?)
-
-  def split_parent_tag_ids(values) = split_values(values).map(&:to_i)
-end

backend/app/controllers/tags_controller.rb

@@ -1,7 +1,3 @@
-require 'net/http'
-require 'uri'
-
-
 class TagsController < ApplicationController
   def index
     post_id = params[:post]
@@ -70,7 +66,7 @@ class TagsController < ApplicationController
             .offset(offset)
             .to_a
 
-    render json: { tags: TagRepr.many(tags), count: q.size }
+    render json: { tags: TagRepr.base(tags), count: q.size }
   end
 
   def with_depth
@@ -168,7 +164,7 @@ class TagsController < ApplicationController
 
   def show_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -186,52 +182,24 @@ class TagsController < ApplicationController
              .find_by(id: params[:id])
     return head :not_found unless tag
 
-    render json: { tag: TagRepr.base(tag),
-                   deerjikists: DeerjikistRepr.many(tag.deerjikists) }
+    render json: DeerjikistRepr.many(tag.deerjikists)
   end
 
   def deerjikists_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, tag_name: :wiki_page)
              .find_by(tag_names: { name: })
     return head :not_found unless tag
 
-    render json: { tag: TagRepr.base(tag),
-                   deerjikists: DeerjikistRepr.many(tag.deerjikists) }
-  end
-
-  def update_deerjikists
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    tag = Tag.joins(:tag_name)
-             .includes(:tag_name, tag_name: :wiki_page)
-             .find_by(id: params[:id])
-    return head :not_found unless tag
-
-    ApplicationRecord.transaction do
-      tag.deerjikists = []
-      params[:_json].each.with_index do |item, i|
-        platform = item[:platform]
-        code = normalise_deerjikist_code(platform, item[:code])
-        deerjikist = Deerjikist.find_or_initialize_by(platform:, code:)
-        deerjikist.tag = tag
-        render_deerjikist_form_record_invalid(deerjikist, i) unless deerjikist.save
-        raise ActiveRecord::Rollback if performed?
-      end
-    end
-
-    return if performed?
-
-    render json: DeerjikistRepr.many(tag.reload.deerjikists)
+    render json: DeerjikistRepr.many(tag.deerjikists)
   end
 
   def materials_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -241,59 +209,6 @@ class TagsController < ApplicationController
     render json: build_tag_children(tag)
   end
 
-  def update_all
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    tag = Tag.find_by(id: params[:id])
-    return head :not_found unless tag
-
-    name = params[:name].to_s.strip
-    category = params[:category].to_s.strip
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
-    return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
-
-    if name != tag.name &&
-        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
-      return render_unprocessable_entity('システム・タグの名称は変更できません．', field: :name)
-    end
-
-    if tag.nico? || category == 'nico'
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
-    end
-
-    alias_names = params[:aliases].to_s.split.uniq
-    parent_names = params[:parent_tags].to_s.split.uniq
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
-
-      old_name = tag.name
-      name_changed = name != old_name
-      wiki_page = tag.tag_name.wiki_page if name_changed
-
-      tag.update!(category:)
-      tag.tag_name.update!(name:)
-
-      alias_names << old_name if name_changed
-      alias_names.delete(name)
-
-      update_aliases!(tag, alias_names)
-      update_parent_tags!(tag, parent_names)
-
-      tag.reload
-
-      record_tag_version!(
-          tag,
-          event_type: :update,
-          created_by_user: current_user,
-          name_changed:,
-          wiki_page:)
-    end
-
-    render json: TagRepr.base(tag.reload)
-  end
-
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -303,36 +218,20 @@ class TagsController < ApplicationController
 
     tag = Tag.find(params[:id])
 
-    if tag.nico? || (category.present? && category == 'nico')
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+    if name.present?
+      tag.tag_name.update!(name:)
     end
 
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
-
-      old_name = tag.name
-      name_changed = name.present? && name != old_name
-      wiki_page = tag.tag_name.wiki_page if name_changed
-
-      tag.tag_name.update!(name:) if name.present?
-      tag.update!(category:) if category.present?
-
-      tag.reload
-
-      record_tag_version!(
-          tag,
-          event_type: :update,
-          created_by_user: current_user,
-          name_changed:,
-          wiki_page:)
+    if category.present?
+      tag.update!(category:)
     end
 
-    render json: TagRepr.base(tag.reload)
+    render json: TagRepr.base(tag)
   end
 
   private
 
-  def build_tag_children tag
+  def build_tag_children(tag)
     material = tag.materials.first
     file = nil
     content_type = nil
@@ -345,116 +244,4 @@ class TagsController < ApplicationController
         children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
         material: material.as_json&.merge(file:, content_type:))
   end
-
-  def record_tag_version! tag, event_type:, created_by_user:, name_changed: false, wiki_page: nil
-    if tag.nico?
-      NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-      return
-    end
-
-    TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-
-    return unless name_changed
-
-    wiki_page ||= tag.tag_name.wiki_page
-    return unless wiki_page&.wiki_versions&.exists?
-
-    WikiVersionRecorder.record!(
-        page: wiki_page,
-        event_type: :update,
-        created_by_user:)
-  end
-
-  def update_aliases! tag, alias_names
-    alias_names = alias_names.uniq
-
-    affected_tags = [tag]
-
-    current_aliases = tag.tag_name.aliases.to_a
-
-    current_aliases.each do |alias_tag_name|
-      next if alias_names.include?(alias_tag_name.name)
-
-      affected_tags << alias_tag_name.canonical&.tag
-    end
-
-    alias_names.each do |alias_name|
-      alias_tag_name = TagName.find_undiscard_or_create_by!(name: alias_name)
-      affected_tags << alias_tag_name.canonical&.tag
-    end
-
-    affected_tags.compact.uniq.each do |affected_tag|
-      TagVersioning.ensure_snapshot!(affected_tag, created_by_user: current_user)
-    end
-
-    current_aliases.each do |alias_tag_name|
-      next if alias_names.include?(alias_tag_name.name)
-
-      alias_tag_name.update!(canonical: nil)
-    end
-
-    alias_names.each do |alias_name|
-      alias_tag_name = TagName.find_undiscard_or_create_by!(name: alias_name)
-      alias_tag_name.update!(canonical: tag.tag_name)
-    end
-
-    affected_tags.compact.uniq.each do |affected_tag|
-      record_tag_version!(affected_tag, event_type: :update, created_by_user: current_user)
-    end
-  end
-
-  def update_parent_tags! tag, parent_names
-    parent_tags = Tag.normalise_tags!(parent_names, with_tagme: false,
-                                                    with_no_deerjikist: false,
-                                                    deny_nico: true)
-
-    old_parent_tags = tag.parents.to_a
-
-    TagVersioning.record_tag_snapshots!((old_parent_tags + parent_tags).uniq,
-                                        created_by_user: current_user)
-
-    tag.reversed_tag_implications.destroy_all
-
-    parent_tags.each do |parent_tag|
-      next if parent_tag == tag
-
-      TagImplication.create!(tag:, parent_tag:)
-    end
-  end
-
-  def normalise_deerjikist_code platform, code
-    return code if platform != 'youtube' || code[0] != '@'
-
-    url = "https://www.youtube.com/#{ code }"
-
-    html = Net::HTTP.get(URI(url))
-
-    canonical = html[
-        /<link rel="canonical" href="https:\/\/www\.youtube\.com\/channel\/(UC[a-zA-Z0-9_-]{22})"/,
-        1]
-    return canonical if canonical
-
-    html[/"channelId":"(UC[a-zA-Z0-9_-]{22})"/, 1] || html[/\bUC[a-zA-Z0-9_-]{22}\b/]
-  rescue
-    nil
-  end
-
-  def render_deerjikist_form_record_invalid deerjikist, index
-    fields = { }
-
-    deerjikist.errors.each do |error|
-      field =
-          case error.attribute
-          when :platform, :code
-            "deerjikists.#{ index }.#{ error.attribute }"
-          else
-            :deerjikists
-          end
-
-      fields[field] ||= []
-      fields[field] << error.full_message
-    end
-
-    render_validation_error fields:
-  end
 end

backend/app/controllers/theatre_comments_controller.rb

@@ -1,28 +1,21 @@
 class TheatreCommentsController < ApplicationController
   def index
-    limit = params[:limit].to_i
-    limit = 20 if limit <= 0
-
     no_gt = params[:no_gt].to_i
-    no_gt = 0 if no_gt < 0
+    no_gt = 0 if no_gt.negative?
 
     comments = TheatreComment
                .where(theatre_id: params[:theatre_id])
                .where('no > ?', no_gt)
                .order(no: :desc)
-               .limit(limit)
 
-    render json: comments.map {
-      _1.as_json(include: { user: { only: [:id, :name] } })
-          .merge(content: _1.discarded? ? nil : _1.content, deleted: _1.discarded?)
-    }
+    render json: comments.as_json(include: { user: { only: [:id, :name] } })
   end
 
   def create
     return head :unauthorized unless current_user
 
     content = params[:content]
-    return render_unprocessable_entity('本文は必須です．', field: :content) if content.blank?
+    return head :unprocessable_entity if content.blank?
 
     theatre = Theatre.find_by(id: params[:theatre_id])
     return head :not_found unless theatre
@@ -36,19 +29,4 @@ class TheatreCommentsController < ApplicationController
 
     render json: comment, status: :created
   end
-
-  def destroy
-    return head :unauthorized unless current_user
-
-    theatre_id = params[:theatre_id].to_i
-    no = params[:id].to_i
-
-    comment = TheatreComment.find_by(theatre_id:, no:)
-    return head :not_found unless comment
-    return head :forbidden unless comment.user == current_user
-
-    comment.discard!
-
-    head :no_content
-  end
 end

backend/app/controllers/theatre_programmes_controller.rb

@@ -1,22 +0,0 @@
-class TheatreProgrammesController < ApplicationController
-  def index
-    limit = params[:limit].to_i
-    limit = 100 if limit <= 0
-
-    position_gt = params[:position_gt].to_i
-    position_gt = 0 if position_gt < 0
-
-    programmes = TheatreProgramme
-                 .where(theatre_id: params[:theatre_id])
-                 .where('position > ?', position_gt)
-                 .includes(:post)
-                 .order(position: :desc).limit(100)
-                 .limit(limit)
-
-    render json: programmes.map { |programme|
-      programme.as_json.merge(post: { id: programme.post.id,
-                                      title: programme.post.title,
-                                      url: programme.post.url })
-    }
-  end
-end

backend/app/controllers/theatre_skip_events_controller.rb

@@ -1,22 +0,0 @@
-class TheatreSkipEventsController < ApplicationController
-  def index
-    limit = params[:limit].to_i
-    limit = 50 if limit <= 0
-
-    events =
-        TheatreSkipEvent
-        .where(theatre_id: params[:theatre_id])
-        .includes(:post, tags: :tag_name)
-        .order(created_at: :desc)
-        .limit(limit)
-
-    render json: events.map { |event|
-      { id: event.id,
-        theatre_id: event.theatre_id,
-        post: { id: event.post.id, title: event.post.title, url: event.post.url },
-        tags: event.tags.map { |tag| { id: tag.id, name: tag.name } },
-        programme_position: event.programme_position,
-        created_at: event.created_at }
-    }
-  end
-end

backend/app/controllers/theatres_controller.rb

@@ -31,7 +31,9 @@ class TheatresController < ApplicationController
       post_started_at = theatre.current_post_started_at
     end
 
-    render json: theatre_info_json(theatre, host_flg:, post_id:, post_started_at:)
+    render json: {
+        host_flg:, post_id:, post_started_at:,
+        watching_users: theatre.watching_users.as_json(only: [:id, :name]) }
   end
 
   def next_post
@@ -41,119 +43,12 @@ class TheatresController < ApplicationController
     return head :not_found unless theatre
     return head :forbidden if theatre.host_user != current_user
 
-    ApplicationRecord.transaction do
-      theatre.lock!
-      TheatrePostAdvancer.call(theatre:)
-    end
+    post = Post.where("url LIKE '%nicovideo.jp%'")
+           .or(Post.where("url LIKE '%youtube.com%'"))
+           .order('RAND()')
+           .first
+    theatre.update!(current_post: post, current_post_started_at: Time.current)
 
     head :no_content
   end
-
-  def skip_vote
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-    requested_post_id = params[:post_id].to_i
-    return head :unprocessable_entity if requested_post_id <= 0
-
-    skipped = false
-    conflicted = false
-
-    ApplicationRecord.transaction do
-      theatre.lock!
-      if theatre.current_post
-        TheatreWatchingUser.find_or_initialize_by(theatre:, user: current_user).tap {
-          _1.expires_at = 30.seconds.from_now
-        }.save!
-
-        if theatre.current_post_id != requested_post_id
-          conflicted = true
-          next
-        end
-
-        TheatreSkipVote.find_or_create_by!(theatre:, post_id: requested_post_id, user: current_user)
-
-        vote_status = skip_vote_status(theatre)
-        if vote_status[:votes_count] >= vote_status[:required_count]
-          TheatreSkipFinalizer.call(theatre:, user: current_user)
-          TheatrePostAdvancer.call(theatre:)
-          skipped = true
-        end
-      end
-    end
-
-    theatre.reload
-    return render json: theatre_info_json(theatre, skipped: false), status: :conflict if conflicted
-
-    render json: theatre_info_json(theatre, skipped:)
-  end
-
-  def unskip_vote
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-    requested_post_id = params[:post_id].to_i
-    return head :unprocessable_entity if requested_post_id <= 0
-
-    conflicted = false
-
-    theatre.with_lock do
-      if theatre.current_post
-        if theatre.current_post_id != requested_post_id
-          conflicted = true
-        else
-          TheatreSkipVote.where(theatre:, post_id: requested_post_id, user: current_user).delete_all
-        end
-      end
-    end
-
-    theatre.reload
-    return render json: theatre_info_json(theatre, skipped: false), status: :conflict if conflicted
-
-    render json: theatre_info_json(theatre, skipped: false)
-  end
-
-  def post_selection_weights
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-
-    render json: TheatrePostSelector.new(theatre:).weight_json
-  end
-
-  private
-
-  def theatre_info_json(theatre, host_flg: nil, post_id: nil, post_started_at: nil, skipped: nil)
-    host_flg = theatre.host_user_id == current_user&.id if host_flg.nil?
-    post_id = theatre.current_post_id if post_id.nil?
-    post_started_at = theatre.current_post_started_at if post_started_at.nil?
-
-    json = { host_flg:,
-             post_id:,
-             post_started_at:,
-             post_elapsed_ms: post_started_at ? ((Time.current - post_started_at) * 1000).floor : nil,
-             watching_users: theatre.watching_users.as_json(only: [:id, :name]),
-             skip_vote: skip_vote_status(theatre) }
-    json[:skipped] = skipped unless skipped.nil?
-    json
-  end
-
-  def skip_vote_status(theatre)
-    watching_user_ids = theatre.watching_users.ids
-    watching_users_count = watching_user_ids.size
-    required_count = (watching_users_count / 2) + 1
-    post = theatre.current_post
-    votes =
-        if post
-          TheatreSkipVote.where(theatre:, post:, user_id: watching_user_ids)
-        else
-          TheatreSkipVote.none
-        end
-
-    { votes_count: post ? votes.count : 0,
-      required_count:,
-      watching_users_count:,
-      voted: post && current_user ? votes.exists?(user_id: current_user.id) : false }
-  end
 end

backend/app/controllers/users_controller.rb

@@ -1,22 +1,18 @@
 class UsersController < ApplicationController
   def create
-    user = nil
-    User.transaction do
-      user = User.create!(inheritance_code: SecureRandom.uuid, role: :guest)
-      attach_ip_address!(user)
-    end
-
+    user = User.create!(inheritance_code: SecureRandom.uuid, role: 'guest')
     render json: { code: user.inheritance_code,
-                   user: user.slice(:id, :name, :inheritance_code, :role) },
-           status: :created
+                   user: user.slice(:id, :name, :inheritance_code, :role) }
   end
 
   def verify
+    ip_bin = IPAddr.new(request.remote_ip).hton
+    ip_address = IpAddress.find_or_create_by!(ip_address: ip_bin)
+
     user = User.find_by(inheritance_code: params[:code])
     return render json: { valid: false } unless user
-    return head :forbidden if user.banned?
 
-    attach_ip_address!(user)
+    UserIp.find_or_create_by!(user:, ip_address:)
 
     render json: { valid: true, user: user.slice(:id, :name, :inheritance_code, :role) }
   end
@@ -42,21 +38,12 @@ class UsersController < ApplicationController
     return head :unauthorized if user&.id != params[:id].to_i
 
     name = params[:name]
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     if user.update(name:)
-      render json: user.slice(:id, :name, :inheritance_code, :role), status: :ok
+      render json: user.slice(:id, :name, :inheritance_code, :role), status: :created
     else
-      render_validation_error user
+      render json: user.errors, status: :unprocessable_entity
     end
   end
-
-  private
-
-  def attach_ip_address! user
-    ip_bin = IPAddr.new(request.remote_ip).hton
-    ip_address = IpAddress.create_or_find_by!(ip_address: ip_bin)
-
-    UserIp.create_or_find_by!(user:, ip_address:)
-  end
 end

backend/app/controllers/wiki_pages_controller.rb

@@ -46,7 +46,7 @@ class WikiPagesController < ApplicationController
 
   def diff
     id = params[:id]
-    return render_bad_request('id は必須です．') if id.blank?
+    return head :bad_request if id.blank?
 
     from = params[:from].presence
     to = params[:to].presence
@@ -56,7 +56,7 @@ class WikiPagesController < ApplicationController
     from_rev = from && page.wiki_revisions.find(from)
     to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
     if ((from_rev && !(from_rev.content?)) || !(to_rev&.content?))
-      return render_unprocessable_entity('差分を表示できない版です．')
+      return head :unprocessable_entity
     end
 
     diffs = Diff::LCS.sdiff(from_rev&.body&.lines || [], to_rev.body.lines)
@@ -85,27 +85,22 @@ class WikiPagesController < ApplicationController
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
 
-    title = params[:title].to_s.strip
+    name = params[:title]&.strip
     body = params[:body].to_s
-    message = params[:message].presence
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if name.blank? || body.blank?
 
-    tag_name = TagName.find_undiscard_or_create_by!(name: title)
+    tag_name = TagName.find_undiscard_or_create_by!(name:)
+    page = WikiPage.new(tag_name:, created_user: current_user, updated_user: current_user)
+    if page.save
+      message = params[:message].presence
+      Wiki::Commit.content!(page:, body:, created_user: current_user, message:)
 
-    page =
-        Wiki::Commit.create_content!(
-            tag_name:,
-            body:,
-            created_by_user: current_user,
-            message:)
-
-    render json: WikiPageRepr.base(page), status: :created
-  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error e.record
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
+      render json: WikiPageRepr.base(page), status: :created
+    else
+      render json: { errors: page.errors.full_messages },
+             status: :unprocessable_entity
+    end
   end
 
   def update
@@ -115,38 +110,22 @@ class WikiPagesController < ApplicationController
     title = params[:title]&.strip
     body = params[:body].to_s
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?
 
     page = WikiPage.find(params[:id])
-    base_revision_id = params[:base_revision_id].presence
+    base_revision_id = page.current_revision.id
 
-    ApplicationRecord.transaction do
-      page.lock!
-
-      old_title = page.title
-
-      tag = Tag.find_by(tag_name_id: page.tag_name_id)
-
-      if tag && title != old_title
-        TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
-      end
-
-      page.tag_name.update!(name: title) if title != old_title
-
-      message = params[:message].presence
-      Wiki::Commit.content!(page:,
-                            body:,
-                            created_user: current_user,
-                            message:,
-                            base_revision_id:)
-
-      if tag && title != old_title
-        tag.reload
-        TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
-      end
+    if params[:title].present? && params[:title].strip != page.title
+      return head :unprocessable_entity
     end
 
+    message = params[:message].presence
+    Wiki::Commit.content!(page:,
+                          body:,
+                          created_user: current_user,
+                          message:,
+                          base_revision_id:)
+
     head :ok
   end
 

backend/app/models/ip_address.rb

@@ -1,10 +1,6 @@
 class IpAddress < ApplicationRecord
   validates :ip_address, presence: true, length: { maximum: 16 }
+  validates :banned, inclusion: { in: [true, false] }
 
-  has_many :user_ips, dependent: :destroy
-  has_many :users, through: :user_ips
-
-  def banned? = banned_at.present?
-  def ban! = banned? || update!(banned_at: Time.current)
-  def unban! = update!(banned_at: nil)
+  has_many :users
 end

backend/app/models/my_discard.rb

@@ -1,11 +1,7 @@
 module MyDiscard
   extend ActiveSupport::Concern
 
-  included do
-    include Discard::Model
-
-    default_scope -> { kept }
-  end
+  included { include Discard::Model }
 
   class_methods do
     def find_undiscard_or_create_by! attrs, &block

backend/app/models/nico_tag_version.rb

@@ -1,7 +0,0 @@
-class NicoTagVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :tag
-
-  validates :name, presence: true
-end

backend/app/models/post.rb

@@ -1,6 +1,7 @@
 class Post < ApplicationRecord
   require 'mini_magick'
 
+  belongs_to :parent, class_name: 'Post', optional: true, foreign_key: 'parent_id'
   belongs_to :uploaded_user, class_name: 'User', optional: true
 
   has_many :post_tags, dependent: :destroy, inverse_of: :post
@@ -12,24 +13,8 @@ class Post < ApplicationRecord
   has_many :post_similarities, dependent: :delete_all
   has_many :post_versions
 
-  has_many :parent_post_implications,
-           class_name: 'PostImplication',
-           foreign_key: :post_id,
-           dependent: :destroy,
-           inverse_of: :post
-  has_many :parents, through: :parent_post_implications, source: :parent_post
-
-  has_many :child_post_implications,
-           class_name: 'PostImplication',
-           foreign_key: :parent_post_id,
-           dependent: :destroy,
-           inverse_of: :parent_post
-  has_many :children, through: :child_post_implications, source: :post
-
   has_one_attached :thumbnail
 
-  attribute :version_no, :integer, default: 1
-
   before_validation :normalise_url
 
   validates :url, presence: true, uniqueness: true
@@ -37,29 +22,17 @@ class Post < ApplicationRecord
   validate :validate_original_created_range
   validate :url_must_be_http_url
 
-  def parent_posts = parents
-
-  def child_posts = children
-
-  def sibling_posts
-    parent_post_ids = parent_posts.order(:id).pluck(:id)
-
-    parent_post_ids.to_h { [_1, PostImplication.where(parent_post: _1).map(&:post)] }
-  end
-
   def as_json options = { }
-    super(options).merge(thumbnail: thumbnail.attached? ?
-                                    Rails.application.routes.url_helpers.rails_blob_url(
-                                        thumbnail, only_path: false) :
-                                    nil)
+    super(options).merge({ thumbnail: thumbnail.attached? ?
+                                      Rails.application.routes.url_helpers.rails_blob_url(
+                                          thumbnail, only_path: false) :
+                                      nil })
   rescue
     super(options).merge(thumbnail: nil)
   end
 
   def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
 
-  def snapshot_parent_post_ids = parents.order(:id).pluck(:id)
-
   def related limit: nil
     ids = post_similarities.order(cos: :desc)
     ids = ids.limit(limit) if limit
@@ -94,7 +67,7 @@ class Post < ApplicationRecord
     return if !(f) || !(b)
 
     if f >= b
-      errors.add :original_created_at, 'オリジナルの作成日時の順番がをかしぃです．'
+      errors.add :original_created_before, 'オリジナルの作成日時の順番がをかしぃです．'
     end
   end
 

backend/app/models/post_implication.rb

@@ -1,19 +0,0 @@
-class PostImplication < ApplicationRecord
-  self.primary_key = :post_id, :parent_post_id
-
-  belongs_to :post, inverse_of: :parent_post_implications
-  belongs_to :parent_post, class_name: 'Post', inverse_of: :child_post_implications
-
-  validates :post_id, presence: true, uniqueness: { scope: :parent_post_id }
-  validates :parent_post_id, presence: true
-
-  validate :parent_post_mustnt_be_itself
-
-  private
-
-  def parent_post_mustnt_be_itself
-    if parent_post_id == post_id
-      errors.add :parent_post_id, '親投稿に同じ投稿を設定することはできません．'
-    end
-  end
-end

backend/app/models/post_version.rb

@@ -1,13 +1,29 @@
 class PostVersion < ApplicationRecord
-  include VersionRecord
+  before_update do
+    raise ActiveRecord::ReadOnlyRecord, '版は更新できません．'
+  end
+
+  before_destroy do
+    raise ActiveRecord::ReadOnlyRecord, '版は削除できません．'
+  end
 
   belongs_to :post
   belongs_to :parent, class_name: 'Post', optional: true
+  belongs_to :created_by_user, class_name: 'User', optional: true
 
+  enum :event_type, { create: 'create',
+                      update: 'update',
+                      discard: 'discard',
+                      restore: 'restore' }, prefix: true, validate: true
+
+  validates :version_no, presence: true, numericality: { only_integer: true, greater_than: 0 }
+  validates :event_type, presence: true, inclusion: { in: event_types.keys }
   validates :url, presence: true
 
   validate :validate_original_created_range
 
+  scope :chronological, -> { order(:version_no, :id) }
+
   private
 
   def validate_original_created_range

backend/app/models/tag.rb

@@ -8,6 +8,8 @@ class Tag < ApplicationRecord
     ;
   end
 
+  default_scope -> { kept }
+
   has_many :post_tags, inverse_of: :tag
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :tag
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
@@ -34,14 +36,9 @@ class Tag < ApplicationRecord
   has_many :deerjikists, dependent: :delete_all
   has_many :materials
 
-  has_many :tag_versions
-  has_many :nico_tag_versions
-
   belongs_to :tag_name
   delegate :wiki_page, to: :tag_name
 
-  attribute :version_no, :integer, default: 1
-
   delegate :name, to: :tag_name, allow_nil: true
   validates :tag_name, presence: true
 
@@ -81,18 +78,29 @@ class Tag < ApplicationRecord
 
   def material_id = materials.first&.id
 
-  def has_deerjikists = deerjikists.loaded? ? deerjikists.any? : deerjikists.exists?
+  def self.tagme
+    @tagme ||= find_or_create_by_tag_name!('タグ希望', category: :meta)
+  end
 
-  def self.tagme = find_or_create_by_tag_name!('タグ希望', category: :meta)
-  def self.bot = find_or_create_by_tag_name!('bot操作', category: :meta)
-  def self.no_deerjikist = find_or_create_by_tag_name!('ニジラー情報不詳', category: :meta)
-  def self.video = find_or_create_by_tag_name!('動画', category: :meta)
-  def self.niconico = find_or_create_by_tag_name!('ニコニコ', category: :meta)
-  def self.youtube = find_or_create_by_tag_name!('YouTube', category: :meta)
+  def self.bot
+    @bot ||= find_or_create_by_tag_name!('bot操作', category: :meta)
+  end
 
-  def self.normalise_tags! tag_names, with_tagme: true,
-                                      with_no_deerjikist: true,
-                                      deny_nico: true
+  def self.no_deerjikist
+    @no_deerjikist ||= find_or_create_by_tag_name!('ニジラー情報不詳', category: :meta)
+  end
+
+  def self.video
+    @video ||= find_or_create_by_tag_name!('動画', category: :meta)
+  end
+
+  def self.niconico
+    @niconico ||= find_or_create_by_tag_name!('ニコニコ', category: :meta)
+  end
+
+  def self.normalise_tags tag_names, with_tagme: true,
+                                     with_no_deerjikist: true,
+                                     deny_nico: true
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
@@ -144,25 +152,21 @@ class Tag < ApplicationRecord
     retry
   end
 
-  def self.merge_tags! target_tag, source_tags, created_by_user: nil
+  def self.merge_tags! target_tag, source_tags
     target_tag => Tag
 
     affected_post_ids = Set.new
 
     Tag.transaction do
-      TagVersioning.ensure_snapshot!(target_tag, created_by_user:)
-
       Array(source_tags).compact.uniq.each do |source_tag|
         source_tag => Tag
 
         next if source_tag == target_tag
 
-        TagVersioning.ensure_snapshot!(source_tag, created_by_user:)
-
         source_tag.post_tags.kept.find_each do |source_pt|
           post_id = source_pt.post_id
           affected_post_ids << post_id
-          source_pt.discard_by!(created_by_user)
+          source_pt.discard_by!(nil)
           unless PostTag.kept.exists?(post_id:, tag: target_tag)
             PostTag.create!(post_id:, tag: target_tag)
           end
@@ -174,7 +178,6 @@ class Tag < ApplicationRecord
           raise ActiveRecord::RecordInvalid.new(source_tag_name)
         end
 
-        TagVersioning.record!(source_tag, event_type: :discard, created_by_user:)
         source_tag.discard!
 
         if source_tag.nico?
@@ -183,13 +186,10 @@ class Tag < ApplicationRecord
           source_tag_name.update_columns(canonical_id: target_tag.tag_name_id,
                                          updated_at: Time.current)
         end
-
-        TagVersioning.record!(target_tag, event_type: :update, created_by_user:)
       end
 
       Post.where(id: affected_post_ids.to_a).find_each do |post|
-        PostVersionRecorder.ensure_snapshot!(post, created_by_user:)
-        PostVersionRecorder.record!(post:, event_type: :update, created_by_user:)
+        PostVersionRecorder.record!(post:, event_type: :update, created_by_user: nil)
       end
 
       # 投稿件数を再集計
@@ -199,14 +199,6 @@ class Tag < ApplicationRecord
     target_tag.reload
   end
 
-  def snapshot_aliases = tag_name.aliases.kept.order(:name).pluck(:name)
-
-  def snapshot_parent_tag_ids = parents.order(:id).pluck(:id)
-
-  def snapshot_linked_tag_names
-    linked_tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-  end
-
   private
 
   def nico_tag_name_must_start_with_nico

backend/app/models/tag_name.rb

@@ -1,6 +1,8 @@
 class TagName < ApplicationRecord
   include MyDiscard
 
+  default_scope -> { kept }
+
   has_one :tag
   has_one :wiki_page
 

backend/app/models/tag_version.rb

@@ -1,15 +0,0 @@
-class TagVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :tag
-
-  enum :category, { deerjikist: 'deerjikist',
-                    meme: 'meme',
-                    character: 'character',
-                    general: 'general',
-                    material: 'material',
-                    meta: 'meta' }, validate: true
-
-  validates :name, presence: true
-  validates :category, presence: true
-end

backend/app/models/theatre.rb

@@ -7,10 +7,6 @@ class Theatre < ApplicationRecord
            class_name: 'TheatreWatchingUser', inverse_of: :theatre
   has_many :watching_users, through: :active_theatre_watching_users, source: :user
 
-  has_many :programmes, class_name: 'TheatreProgramme'
-  has_many :skip_votes, class_name: 'TheatreSkipVote', dependent: :delete_all
-  has_many :skip_events, class_name: 'TheatreSkipEvent', dependent: :delete_all
-
   belongs_to :host_user, class_name: 'User', optional: true
   belongs_to :current_post, class_name: 'Post', optional: true
   belongs_to :created_by_user, class_name: 'User'

backend/app/models/theatre_programme.rb

@@ -1,6 +0,0 @@
-class TheatreProgramme < ApplicationRecord
-  self.primary_key = :theatre_id, :position
-
-  belongs_to :theatre
-  belongs_to :post
-end

backend/app/models/theatre_skip_event.rb

@@ -1,10 +0,0 @@
-class TheatreSkipEvent < ApplicationRecord
-  belongs_to :theatre
-  belongs_to :post
-  belongs_to :skipped_by_user, class_name: 'User'
-
-  has_many :voters, class_name: 'TheatreSkipEventVoter', dependent: :delete_all
-  has_many :event_tags, class_name: 'TheatreSkipEventTag', dependent: :delete_all
-  has_many :users, through: :voters
-  has_many :tags, through: :event_tags
-end

backend/app/models/theatre_skip_event_tag.rb

@@ -1,6 +0,0 @@
-class TheatreSkipEventTag < ApplicationRecord
-  self.primary_key = :theatre_skip_event_id, :tag_id
-
-  belongs_to :theatre_skip_event
-  belongs_to :tag
-end

backend/app/models/theatre_skip_event_voter.rb

@@ -1,6 +0,0 @@
-class TheatreSkipEventVoter < ApplicationRecord
-  self.primary_key = :theatre_skip_event_id, :user_id
-
-  belongs_to :theatre_skip_event
-  belongs_to :user
-end

backend/app/models/theatre_skip_vote.rb

@@ -1,7 +0,0 @@
-class TheatreSkipVote < ApplicationRecord
-  self.primary_key = :theatre_id, :post_id, :user_id
-
-  belongs_to :theatre
-  belongs_to :post
-  belongs_to :user
-end

backend/app/models/user.rb

@@ -4,6 +4,7 @@ class User < ApplicationRecord
   validates :name, length: { maximum: 255 }
   validates :inheritance_code, presence: true, length: { maximum: 64 }
   validates :role, presence: true, inclusion: { in: roles.keys }
+  validates :banned, inclusion: { in: [true, false] }
 
   has_many :created_posts,
            class_name: 'Post', foreign_key: :uploaded_user_id, dependent: :nullify
@@ -18,10 +19,5 @@ class User < ApplicationRecord
            class_name: 'WikiPage', foreign_key: :updated_user_id, dependent: :nullify
 
   def viewed?(post) = user_post_views.exists?(post_id: post.id)
-
   def gte_member? = member? || admin?
-
-  def banned? = banned_at.present?
-  def ban! = banned? || update!(banned_at: Time.current)
-  def unban! = update!(banned_at: nil)
 end

backend/app/models/version_record.rb

@@ -1,19 +0,0 @@
-module VersionRecord
-  extend ActiveSupport::Concern
-
-  def readonly? = persisted?
-
-  included do
-    belongs_to :created_by_user, class_name: 'User', optional: true
-
-    enum :event_type, { create: 'create',
-                        update: 'update',
-                        discard: 'discard',
-                        restore: 'restore' }, prefix: true, validate: true
-
-    validates :version_no, presence: true, numericality: { only_integer: true, greater_than: 0 }
-    validates :event_type, presence: true
-
-    scope :chronological, -> { order(:version_no, :id) }
-  end
-end

backend/app/models/wiki_page.rb

@@ -4,6 +4,8 @@ require 'set'
 class WikiPage < ApplicationRecord
   include MyDiscard
 
+  default_scope -> { kept }
+
   has_many :wiki_revisions, dependent: :destroy
   belongs_to :created_user, class_name: 'User'
   belongs_to :updated_user, class_name: 'User'
@@ -13,13 +15,8 @@ class WikiPage < ApplicationRecord
            foreign_key: :redirect_page_id,
            dependent: :nullify
 
-  has_many :wiki_versions
-
-  attribute :version_no, :integer, default: 1
-
   belongs_to :tag_name
   validates :tag_name, presence: true
-  validates :body, presence: true
 
   def title = tag_name.name
 
@@ -29,6 +26,11 @@ class WikiPage < ApplicationRecord
 
   def current_revision = wiki_revisions.order(id: :desc).first
 
+  def body
+    rev = current_revision
+    rev.body if rev&.content?
+  end
+
   def resolve_redirect limit: 10
     page = self
     visited = Set.new

backend/app/models/wiki_version.rb

@@ -1,8 +0,0 @@
-class WikiVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :wiki_page
-
-  validates :title, presence: true
-  validates :body, presence: true
-end

backend/app/representations/post_repr.rb

@@ -2,65 +2,19 @@
 
 
 module PostRepr
-  BASE_FIELDS = [
-      :id,
-      :version_no,
-      :url,
-      :title,
-      :thumbnail_base,
-      :original_created_from,
-      :original_created_before,
-      :created_at,
-      :updated_at
-  ].freeze
+  BASE = { include: { tags: TagRepr::BASE, uploaded_user: UserRepr::BASE } }.freeze
 
   module_function
 
   def base post, current_user = nil
-    json = common(post)
-    json['tags'] = tag_json(post.tags)
-    json['uploaded_user'] = post.uploaded_user && UserRepr.base(post.uploaded_user)
-    json['viewed'] = current_user ? current_user.viewed?(post) : false
-    json
-  end
+    json = post.as_json(BASE)
+    return json.merge(viewed: false) unless current_user
 
-  def detail post, current_user = nil, parent_posts: [], child_posts: [],
-             sibling_posts: { }, related: []
-    base(post, current_user).merge(
-        'parent_posts' => cards(parent_posts),
-        'child_posts' => cards(child_posts),
-        'sibling_posts' => sibling_posts.transform_keys(&:to_s).transform_values { |posts|
-          cards(posts)
-        },
-        'related' => cards(related))
-  end
-
-  def card post
-    common(post).merge('parent_posts' => [], 'child_posts' => [])
-  end
-
-  def cards posts
-    posts.map { |post| card(post) }
+    viewed = current_user.viewed?(post)
+    json.merge(viewed:)
   end
 
   def many posts, current_user = nil
     posts.map { |p| base(p, current_user) }
   end
-
-  def common post
-    BASE_FIELDS.to_h { |field| [field.to_s, post.public_send(field)] }
-               .merge('thumbnail' => thumbnail_url(post))
-  end
-
-  def tag_json tags
-    tags.map { |tag| TagRepr.inline(tag) }
-  end
-
-  def thumbnail_url post
-    return nil unless post.thumbnail.attached?
-
-    Rails.application.routes.url_helpers.rails_blob_url(post.thumbnail, only_path: false)
-  rescue
-    nil
-  end
 end

backend/app/representations/tag_repr.rb

@@ -3,18 +3,15 @@
 
 module TagRepr
   BASE = { only: [:id, :category, :post_count, :created_at, :updated_at],
-           methods: [:name, :has_wiki, :material_id, :has_deerjikists] }.freeze
+           methods: [:name, :has_wiki, :material_id] }.freeze
 
   module_function
 
   def base tag
-    tag.as_json(BASE).merge(aliases: tag.snapshot_aliases,
-                            parents: tag.parents.map { _1.as_json(BASE) })
+    tag.as_json(BASE)
   end
 
-  def inline tag
-    tag.as_json(BASE).merge(aliases: [], parents: [])
+  def many tags
+    tags.map { |t| base(t) }
   end
-
-  def many(tags) = tags.map { |t| base(t) }
 end

backend/app/services/nico_tag_version_recorder.rb

@@ -1,19 +0,0 @@
-class NicoTagVersionRecorder < VersionRecorder
-  def self.record! tag:, event_type:, created_by_user:
-    new(tag:, event_type:, created_by_user:).record!
-  end
-
-  def initialize tag:, event_type:, created_by_user:
-    super(record: tag, event_type:, created_by_user:)
-  end
-
-  private
-
-  def version_class = NicoTagVersion
-  def version_association = :nico_tag_versions
-  def record_key = :tag
-
-  def snapshot_attributes
-    { name: @record.name, linked_tags: @record.snapshot_linked_tag_names.join(' ') }
-  end
-end

backend/app/services/post_version_recorder.rb

@@ -1,31 +1,57 @@
-class PostVersionRecorder < VersionRecorder
+class PostVersionRecorder
   def self.record! post:, event_type:, created_by_user:
     new(post:, event_type:, created_by_user:).record!
   end
 
   def initialize post:, event_type:, created_by_user:
-    super(record: post, event_type:, created_by_user:)
+    @post = post
+    @event_type = event_type
+    @created_by_user = created_by_user
   end
 
-  def self.ensure_snapshot! post, created_by_user:
-    return if post.post_versions.exists?
+  def record!
+    @post.with_lock do
+      latest = @post.post_versions.order(version_no: :desc).first
+      attrs = snapshot_attributes
 
-    record!(post:, event_type: :create, created_by_user:)
+      return latest if @event_type == :update && latest && same_snapshot?(latest, attrs)
+
+      PostVersion.create!(
+          post: @post,
+          version_no: (latest&.version_no || 0) + 1,
+          event_type: @event_type,
+          title: attrs[:title],
+          url: attrs[:url],
+          thumbnail_base: attrs[:thumbnail_base],
+          tags: attrs[:tags],
+          parent: attrs[:parent],
+          original_created_from: attrs[:original_created_from],
+          original_created_before: attrs[:original_created_before],
+          created_at: Time.current,
+          created_by_user: @created_by_user)
+    end
   end
 
   private
 
-  def version_class = PostVersion
-  def version_association = :post_versions
-  def record_key = :post
-
   def snapshot_attributes
-    { title: @record.title,
-      url: @record.url,
-      thumbnail_base: @record.thumbnail_base,
-      tags: @record.snapshot_tag_names.join(' '),
-      parent_post_ids: @record.snapshot_parent_post_ids.join(' '),
-      original_created_from: @record.original_created_from,
-      original_created_before: @record.original_created_before }
+    { title: @post.title,
+      url: @post.url,
+      thumbnail_base: @post.thumbnail_base,
+      tags: @post.snapshot_tag_names.join(' '),
+      parent: @post.parent,
+      original_created_from: @post.original_created_from,
+      original_created_before: @post.original_created_before }
+  end
+
+  def same_snapshot? version, attrs
+    true &&
+        version.title == attrs[:title] &&
+        version.url == attrs[:url] &&
+        version.thumbnail_base == attrs[:thumbnail_base] &&
+        version.tags == attrs[:tags] &&
+        version.parent_id == attrs[:parent]&.id &&
+        version.original_created_from == attrs[:original_created_from] &&
+        version.original_created_before == attrs[:original_created_before]
   end
 end

backend/app/services/tag_version_recorder.rb

@@ -1,22 +0,0 @@
-class TagVersionRecorder < VersionRecorder
-  def self.record! tag:, event_type:, created_by_user:
-    new(tag:, event_type:, created_by_user:).record!
-  end
-
-  def initialize tag:, event_type:, created_by_user:
-    super(record: tag, event_type:, created_by_user:)
-  end
-
-  private
-
-  def version_class = TagVersion
-  def version_association = :tag_versions
-  def record_key = :tag
-
-  def snapshot_attributes
-    { name: @record.name,
-      category: @record.category,
-      aliases: @record.snapshot_aliases.join(' '),
-      parent_tag_ids: @record.snapshot_parent_tag_ids.join(' ') }
-  end
-end

backend/app/services/tag_versioning.rb

@@ -1,38 +0,0 @@
-class TagVersioning
-  def self.record! tag, event_type:, created_by_user:
-    if tag.nico?
-      NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    else
-      TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    end
-  end
-
-  def self.ensure_snapshot! tag, created_by_user:
-    if tag.nico?
-      return if tag.nico_tag_versions.exists?
-
-      NicoTagVersionRecorder.record!(tag:, event_type: :create, created_by_user:)
-    else
-      return if tag.tag_versions.exists?
-
-      TagVersionRecorder.record!(tag:, event_type: :create, created_by_user:)
-    end
-  end
-
-  def self.record_tag_snapshot! tag, created_by_user:
-    event_type =
-        if tag.nico?
-          tag.nico_tag_versions.exists? ? :update : :create
-        else
-          tag.tag_versions.exists? ? :update : :create
-        end
-
-    record!(tag, event_type:, created_by_user:)
-  end
-
-  def self.record_tag_snapshots! tags, created_by_user:
-    tags.each do |tag|
-      record_tag_snapshot!(tag, created_by_user:)
-    end
-  end
-end

backend/app/services/theatre_post_advancer.rb

@@ -1,29 +0,0 @@
-class TheatrePostAdvancer
-  def self.call(theatre:)
-    new(theatre:).call
-  end
-
-  def initialize(theatre:)
-    @theatre = theatre
-  end
-
-  def call
-    previous_post = theatre.current_post
-    post = TheatrePostSelector.new(theatre:).select
-
-    TheatreSkipVote.where(theatre:, post: previous_post).delete_all if previous_post
-
-    theatre.update!(current_post: post, current_post_started_at: post ? Time.current : nil)
-
-    if post
-      position = (theatre.programmes.maximum(:position) || 0) + 1
-      theatre.programmes.create!(position:, post:)
-    end
-
-    post
-  end
-
-  private
-
-  attr_reader :theatre
-end

backend/app/services/theatre_post_selector.rb

@@ -1,119 +0,0 @@
-class TheatrePostSelector
-  Candidate = Struct.new(:post, :weight, :penalty, :tags, keyword_init: true)
-  ELIGIBLE_POST_URL_CONDITION =
-      ["url LIKE '%nicovideo.jp%'",
-       "url LIKE '%youtube.com/watch%'",
-       "url LIKE '%youtu.be/%'"]
-      .join(' OR ')
-
-  def initialize theatre:
-    @theatre = theatre
-  end
-
-  def select
-    candidates = weighted_candidates
-    return nil if candidates.empty?
-
-    total = candidates.sum(&:weight)
-    target = rand * total
-
-    candidates.each do |candidate|
-      target -= candidate.weight
-      return candidate.post if target <= 0
-    end
-
-    candidates.last.post
-  end
-
-  def weight_json limit: 20
-    candidates = weighted_candidates
-    sorted = candidates.sort_by { |candidate| [candidate.weight, candidate.post.id] }
-
-    { tag_penalties: tag_penalty_json,
-      lightest_posts: post_weight_json(sorted.first(limit)),
-      heaviest_posts: post_weight_json(sorted.reverse.first(limit)) }
-  end
-
-  private
-
-  attr_reader :theatre
-
-  def weighted_candidates
-    @weighted_candidates ||= begin
-      penalties = tag_penalties
-      posts = eligible_posts.includes(tags: :tag_name).to_a
-
-      posts.map do |post|
-        post_tags = post.tags.to_a
-        penalty = post_tags.sum { |tag| penalties[tag.id].to_i }
-
-        Candidate.new(
-            post:,
-            penalty:,
-            tags: post_tags,
-            weight: 1.0 / (1.0 + penalty))
-      end
-    end
-  end
-
-  def eligible_posts
-    posts = Post.where(ELIGIBLE_POST_URL_CONDITION)
-    posts = posts.where.not(id: theatre.current_post_id) if theatre.current_post_id
-    posts
-  end
-
-  def active_user_ids
-    @active_user_ids ||= theatre.watching_users.ids
-  end
-
-  def tag_penalties
-    @tag_penalties ||=
-      if active_user_ids.empty?
-        {}
-      else
-        TheatreSkipEventVoter
-          .joins(theatre_skip_event: :event_tags)
-          .where(user_id: active_user_ids)
-          .group('theatre_skip_event_tags.tag_id')
-          .count
-      end
-  end
-
-  def tag_penalty_json
-    return [] if tag_penalties.empty?
-
-    tags = Tag.where(id: tag_penalties.keys).includes(:tag_name).index_by(&:id)
-
-    tag_penalties
-      .map { |tag_id, penalty|
-        tag = tags[tag_id]
-        next unless tag
-
-        { tag: light_tag_json(tag),
-          penalty: }
-      }
-      .compact
-      .sort_by { |row| [-row[:penalty], row[:tag][:name].to_s] }
-  end
-
-  def post_weight_json candidates
-    candidates.map { |candidate|
-      { post: light_post_json(candidate.post),
-        weight: candidate.weight,
-        penalty: candidate.penalty,
-        tags: candidate.tags.map { |tag| light_tag_json(tag) } }
-    }
-  end
-
-  def light_post_json post
-    { id: post.id,
-      title: post.title,
-      url: post.url }
-  end
-
-  def light_tag_json tag
-    { id: tag.id,
-      name: tag.name,
-      category: tag.category }
-  end
-end

backend/app/services/theatre_skip_finalizer.rb

@@ -1,40 +0,0 @@
-class TheatreSkipFinalizer
-  def self.call(theatre:, user:)
-    new(theatre:, user:).call
-  end
-
-  def initialize(theatre:, user:)
-    @theatre = theatre
-    @user = user
-  end
-
-  def call
-    return unless theatre.current_post
-
-    post = theatre.current_post
-    voters = TheatreSkipVote.where(theatre:, post:).includes(:user).map(&:user)
-    return if voters.empty?
-
-    event = TheatreSkipEvent.create!(
-        theatre:,
-        post:,
-        skipped_by_user: user,
-        programme_position: theatre.programmes.maximum(:position))
-
-    voters.uniq(&:id).each do |voter|
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: voter)
-    end
-
-    post.tags.find_each do |tag|
-      TheatreSkipEventTag.create!(theatre_skip_event: event, tag:)
-    end
-
-    TheatreSkipVote.where(theatre:, post:).delete_all
-
-    event
-  end
-
-  private
-
-  attr_reader :theatre, :user
-end

backend/app/services/version_recorder.rb

@@ -1,87 +0,0 @@
-class VersionRecorder
-  EVENT_TYPES = ['create', 'update', 'discard', 'restore'].freeze
-
-  def initialize record:, event_type:, created_by_user:
-    @record = record
-    @event_type = event_type.to_s
-    @created_by_user = created_by_user
-
-    validate_event_type!
-  end
-
-  def record!
-    raise "#{ record_class.name } must be persisted" unless @record.persisted?
-
-    ApplicationRecord.transaction do
-      @record = record_class.unscoped.lock.find(@record.id)
-      latest = latest_version
-
-      validate_version_sequence!(latest)
-
-      attrs = snapshot_attributes
-
-      if @event_type == 'update' && latest && same_snapshot?(latest, attrs)
-        return latest
-      end
-
-      version = version_class.create!(
-          base_attributes(latest).merge(record_key => @record).merge(attrs))
-
-      update_record_version_no!(version.version_no)
-
-      version
-    end
-  end
-
-  private
-
-  def latest_version = versions.order(version_no: :desc).first
-
-  def versions = @record.public_send(version_association)
-
-  def base_attributes latest
-    { version_no: (latest&.version_no || 0) + 1,
-      event_type: @event_type,
-      created_at: Time.current,
-      created_by_user: @created_by_user }
-  end
-
-  def update_record_version_no! version_no
-    @record.update_columns(version_no:)
-    @record.version_no = version_no
-  end
-
-  def validate_version_sequence! latest
-    if !(latest) && @event_type != 'create'
-      raise "#{ version_class.name } first event must be create"
-    end
-
-    if @event_type == 'create' && latest
-      raise "#{ version_class.name } create event already exists"
-    end
-
-    return unless latest
-
-    if @record.version_no != latest.version_no
-      raise ("#{ record_class.name }##{ @record.id } version_no is #{ @record.version_no }, " +
-             "but latest #{ version_class.name } version_no is #{ latest.version_no }")
-    end
-  end
-
-  def same_snapshot? version, attrs
-    attrs.all? { |k, v| version.public_send(k) == v }
-  end
-
-  def validate_event_type!
-    return if EVENT_TYPES.include?(@event_type)
-
-    raise ArgumentError, "Invalid event_type: #{ @event_type }"
-  end
-
-  def version_class = raise NotImplementedError
-  def version_association = raise NotImplementedError
-  def record_key = raise NotImplementedError
-  def snapshot_attributes = raise NotImplementedError
-
-  def record_class = @record.class
-end

backend/app/services/wiki/commit.rb

@@ -7,31 +7,6 @@ module Wiki
       ;
     end
 
-    def self.create_content! tag_name:, body:, created_by_user:, message: nil
-      normalised = normalise_body(body)
-
-      page = WikiPage.new(tag_name:,
-                          body: normalised,
-                          created_user: created_by_user,
-                          updated_user: created_by_user)
-
-      if normalised.blank?
-        page.errors.add(:body, :blank)
-        raise ActiveRecord::RecordInvalid, page
-      end
-
-      ActiveRecord::Base.transaction do
-        page.save!
-
-        new(page:, created_user: created_by_user).content!(
-            body: normalised,
-            message:,
-            base_revision_id: nil)
-
-        page
-      end
-    end
-
     def self.content! page:, body:, created_user:, message: nil, base_revision_id: nil
       new(page:, created_user:).content!(body:, message:, base_revision_id:)
     end
@@ -46,12 +21,7 @@ module Wiki
     end
 
     def content! body:, message:, base_revision_id:
-      normalised = self.class.normalise_body(body)
-      if normalised.blank?
-        @page.errors.add(:body, :blank)
-        raise ActiveRecord::RecordInvalid, @page
-      end
-
+      normalised = normalise_body(body)
       lines = split_lines(normalised)
 
       line_shas = lines.map { |line| Digest::SHA256.hexdigest(line) }
@@ -67,19 +37,10 @@ module Wiki
           current_id = @page.wiki_revisions.maximum(:id)
           if current_id && current_id != base_revision_id.to_i
             raise Conflict,
-                "競合が発生してゐます" +
-                "（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
+                "競合が発生してゐます（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
           end
         end
 
-        @page.update!(body: normalised)
-
-        WikiVersionRecorder.record!(
-            page: @page,
-            event_type: @page.wiki_versions.exists? ? :update : :create,
-            reason: message,
-            created_by_user: @created_user)
-
         rev = WikiRevision.create!(
             wiki_page:        @page,
             base_revision_id:,
@@ -93,45 +54,65 @@ module Wiki
         rows = line_ids.each_with_index.map do |line_id, pos|
           { wiki_revision_id: rev.id, wiki_line_id: line_id, position: pos }
         end
-        WikiRevisionLine.insert_all!(rows) if rows.any?
+        WikiRevisionLine.insert_all!(rows)
 
         rev
       end
     end
 
-    def redirect!(redirect_page:, message:, base_revision_id:) = raise '廃止しました．'
+    def redirect! redirect_page:, message:, base_revision_id:
+      ActiveRecord::Base.transaction do
+        @page.lock!
 
-    def self.normalise_body body
-      s = body.to_s
-      s.gsub!(/\r\n?/, "\n")
-      s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
-      s.gsub(/\n+$/, '')
+        if base_revision_id.present?
+          current_id = @page.wiki_revisions.maximum(:id)
+          if current_id && current_id != base_revision_id.to_i
+            raise Conflict,
+                "競合が発生してゐます（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
+          end
+        end
+
+        WikiRevision.create!(
+            wiki_page:        @page,
+            base_revision_id:,
+            created_user:     @created_user,
+            kind:             :redirect,
+            redirect_page:,
+            message:,
+            lines_count:      0,
+            tree_sha256:      nil)
+      end
     end
 
     private
 
-    def split_lines(body) = body.split("\n")
+    def normalise_body body
+      s = body.to_s
+      s.gsub!("\r\n", "\n")
+      s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
+    end
+
+    def split_lines body
+      body.split("\n")
+    end
 
     def upsert_lines! lines, line_shas
       now = Time.current
 
       id_by_sha = WikiLine.where(sha256: line_shas).pluck(:sha256, :id).to_h
 
-      missing_by_sha = { }
-
+      missing_rows = []
       line_shas.each_with_index do |sha, i|
         next if id_by_sha.key?(sha)
-        next if missing_by_sha.key?(sha)
 
-        missing_by_sha[sha] = {
-            sha256:     sha,
-            body:       lines[i],
-            created_at: now,
-            updated_at: now }
+        missing_rows << { sha256:     sha,
+                          body:       lines[i],
+                          created_at: now,
+                          updated_at: now }
       end
 
-      if missing_by_sha.any?
-        WikiLine.upsert_all(missing_by_sha.values)
+      if missing_rows.any?
+        WikiLine.upsert_all(missing_rows)
         id_by_sha = WikiLine.where(sha256: line_shas).pluck(:sha256, :id).to_h
       end
 

backend/app/services/wiki_version_recorder.rb

@@ -1,21 +0,0 @@
-class WikiVersionRecorder < VersionRecorder
-  def self.record! page:, event_type:, reason: nil, created_by_user:
-    new(page:, event_type:, reason:, created_by_user:).record!
-  end
-
-  def initialize page:, event_type:, reason: nil, created_by_user:
-    @reason = reason
-    super(record: page, event_type:, created_by_user:)
-  end
-
-  private
-
-  def version_class = WikiVersion
-  def version_association = :wiki_versions
-  def record_key = :wiki_page
-
-  def snapshot_attributes = {
-      title: @record.title,
-      body: @record.body,
-      reason: @reason }
-end

backend/app/services/youtube/api_client.rb

@@ -1,73 +0,0 @@
-require 'json'
-require 'net/http'
-require 'uri'
-
-
-module Youtube
-  class ApiClient
-    ENDPOINT = 'https://www.googleapis.com/youtube/v3'
-
-    def initialize api_key: ENV.fetch('YOUTUBE_API_KEY')
-      @api_key = api_key
-    end
-
-    def search_videos q:, published_after: nil, published_before: nil, page_token: nil
-      get_json('/search', {
-          part:           'snippet',
-          type:           'video',
-          q:,
-          order:          'date',
-          maxResults:     50,
-          regionCode:     'JP',
-          relevanceLanguage: 'ja',
-          publishedAfter: published_after&.iso8601,
-          publishedBefore: published_before&.iso8601,
-          pageToken:      page_token }.compact)
-    end
-
-    def videos ids
-      return { 'items' => [] } if ids.empty?
-
-      get_json('/videos', part: 'snippet,status,contentDetails', id: ids.join(','))
-    end
-
-    def playlist_items playlist_id:, page_token: nil
-      get_json('/playlistItems', {
-          part:       'snippet,contentDetails,status',
-          playlistId: playlist_id,
-          maxResults: 50,
-          pageToken:  page_token }.compact)
-    end
-
-    def channel id: nil, handle: nil
-      raise ArgumentError, 'id or handle is required' if id.present? == handle.present?
-
-      params = { part: 'snippet,contentDetails' }
-      params[:id] = id if id.present?
-      params[:forHandle] = handle if handle.present?
-
-      get_json('/channels', params)
-    end
-
-    private
-
-    def get_json path, params
-      uri = URI(ENDPOINT + path)
-      uri.query = URI.encode_www_form(params.merge(key: @api_key))
-
-      response = Net::HTTP.start(uri.host,
-                                 uri.port,
-                                 use_ssl: true,
-                                 open_timeout: 10,
-                                 read_timeout: 30) do |http|
-        http.get(uri)
-      end
-
-      unless response.is_a?(Net::HTTPSuccess)
-        raise "YouTube API error: #{ response.code } #{ response.body }"
-      end
-
-      JSON.parse(response.body)
-    end
-  end
-end

backend/app/services/youtube/sync.rb

@@ -1,168 +0,0 @@
-require 'open-uri'
-require 'set'
-require 'time'
-
-
-module Youtube
-  class Sync
-    def initialize client: ApiClient.new
-      @client = client
-    end
-
-    def sync!
-      video_ids = discover_video_ids
-      return if video_ids.empty?
-
-      video_ids.each_slice(50) do |ids|
-        @client.videos(ids).fetch('items', []).each do |item|
-          sync_video!(VideoItem.new(item))
-        end
-      end
-    end
-
-    private
-
-    def discover_video_ids
-      ids = Set.new
-
-      query_terms.each do |q|
-        response = @client.search_videos(q:, published_after: sync_since)
-
-        response.fetch('items', []).each do |item|
-          video_id = item.dig('id', 'videoId')
-          ids << video_id if video_id.present?
-        end
-      end
-
-      playlist_ids.each do |playlist_id|
-        each_playlist_item(playlist_id) do |item|
-          video_id = item.dig('contentDetails', 'videoId')
-          video_id ||= item.dig('snippet', 'resourceId', 'videoId')
-
-          ids << video_id if video_id.present?
-        end
-      end
-
-      ids.to_a
-    end
-
-    def sync_video! video
-      post = Post.where('url REGEXP ?', youtube_url_regexp(video.id)).first
-
-      original_created_from = video.published_at.change(sec: 0)
-      original_created_before = original_created_from + 1.minute
-
-      post_created = false
-      post_changed = false
-
-      if post
-        post.assign_attributes(title: video.title,
-                               original_created_from:,
-                               original_created_before:,
-                               thumbnail_base: video.thumbnail_url)
-
-        post_changed = post.changed?
-        post.save! if post_changed
-
-        attach_thumbnail_if_needed!(post, video.thumbnail_url)
-      else
-        post_created = true
-        post = Post.create!(
-            title: video.title,
-            url: video.url,
-            thumbnail_base: video.thumbnail_url,
-            uploaded_user_id: nil,
-            original_created_from:,
-            original_created_before:)
-
-        attach_thumbnail_if_needed!(post, video.thumbnail_url)
-
-        sync_post_tags!(post, [Tag.tagme.id, Tag.bot.id, Tag.youtube.id, Tag.video.id])
-      end
-
-      kept_tag_ids = post.tags.pluck(:id).to_set
-      desired_tag_ids = kept_tag_ids.to_a
-
-      deerjikist = Deerjikist.find_by(platform: :youtube, code: video.channel_id)
-      if deerjikist
-        desired_tag_ids.delete(Tag.no_deerjikist.id)
-        desired_tag_ids << deerjikist.tag_id
-      elsif post.tags.where(category: :deerjikist).none?
-        desired_tag_ids << Tag.no_deerjikist.id
-      end
-
-      desired_tag_ids.uniq!
-
-      sync_post_tags!(post, desired_tag_ids, current_tag_ids: kept_tag_ids)
-
-      if post_created
-        PostVersionRecorder.record!(post:, event_type: :create, created_by_user: nil)
-      elsif post_changed || kept_tag_ids != desired_tag_ids.to_set
-        PostVersionRecorder.ensure_snapshot!(post, created_by_user: nil)
-        PostVersionRecorder.record!(post:, event_type: :update, created_by_user: nil)
-      end
-    end
-
-    def sync_post_tags! post, desired_tag_ids, current_tag_ids: nil
-      current_tag_ids ||= PostTag.kept.where(post_id: post.id).pluck(:tag_id).to_set
-      desired_tag_ids = desired_tag_ids.compact.to_set
-
-      to_add = desired_tag_ids - current_tag_ids
-      to_remove = current_tag_ids - desired_tag_ids
-
-      Tag.where(id: to_add.to_a).find_each do |tag|
-        begin
-          PostTag.create!(post:, tag:)
-        rescue ActiveRecord::RecordNotUnique
-          ;
-        end
-      end
-
-      PostTag.where(post_id: post.id, tag_id: to_remove.to_a).kept.find_each do |pt|
-        pt.discard_by!(nil)
-      end
-    end
-
-    def attach_thumbnail_if_needed! post, thumbnail_url
-      return if post.thumbnail.attached?
-      return if thumbnail_url.blank?
-
-      post.thumbnail.attach(
-          io:           URI.open(thumbnail_url),
-          filename:     File.basename(URI.parse(thumbnail_url).path),
-          content_type: 'image/jpeg')
-
-      post.resized_thumbnail!
-    end
-
-    def youtube_url_regexp id
-      escaped = Regexp.escape(id)
-      "(youtube\\.com/watch\\?v=#{ escaped }|youtu\\.be/#{ escaped })([^A-Za-z0-9_-]|$)"
-    end
-
-    def query_terms = ['ぼざろクリーチャーシリーズ', '伊地知ニジカ', '伊地知虹鹿']
-
-    def playlist_ids
-      ['PLrOch4zHkI5vu29b-f9umUQQ4tQkuWLPX',
-       'PLrOch4zHkI5vOK0RaytQq6PbucxQkkL0K',
-       'PLrOch4zHkI5tdwm9vSegiDQJOM-hgpcOC']
-    end
-
-    def sync_since = 14.days.ago
-
-    def each_playlist_item playlist_id
-      page_token = nil
-
-      loop do
-        response = @client.playlist_items(playlist_id:, page_token:)
-
-        response.fetch('items', []).each do |item|
-          yield item
-        end
-
-        page_token = response['nextPageToken']
-        break if page_token.blank?
-      end
-    end
-  end
-end

backend/app/services/youtube/video_item.rb

@@ -1,32 +0,0 @@
-require 'time'
-
-
-module Youtube
-  class VideoItem
-    attr_reader :id, :title, :channel_id, :published_at, :thumbnail_url, :raw_tags
-
-    def initialize item
-      snippet = item.fetch('snippet')
-
-      @id = item.fetch('id')
-      @title = snippet['title']
-      @channel_id = snippet['channelId']
-      @published_at = Time.iso8601(snippet['publishedAt'])
-      @thumbnail_url = pick_thumbnail(snippet['thumbnails'] || { })
-      @raw_tags = snippet['tags'] || []
-    end
-
-    def url = "https://www.youtube.com/watch?v=#{ @id }"
-
-    private
-
-    def pick_thumbnail thumbnails
-      ['maxres', 'standard', 'high', 'medium', 'default'].each do |key|
-        url = thumbnails.dig(key, 'url')
-        return url if url.present?
-      end
-
-      nil
-    end
-  end
-end

backend/config/routes.rb

@@ -6,11 +6,10 @@ Rails.application.routes.draw do
     delete ':child_id', action: :destroy
   end
 
-  resources :tags, only: [:index, :show] do
+  resources :tags, only: [:index, :show, :update] do
     collection do
       get :autocomplete
       get :'with-depth', action: :with_depth
-      get :versions, to: 'tag_versions#index'
 
       scope :name do
         get ':name/deerjikists', action: :deerjikists_by_name
@@ -20,11 +19,7 @@ Rails.application.routes.draw do
     end
 
     member do
-      put '', action: :update_all
-      patch '', action: :update
-
       get :deerjikists
-      put :deerjikists, action: :update_deerjikists
     end
   end
 
@@ -85,14 +80,9 @@ Rails.application.routes.draw do
     member do
       put :watching
       patch :next_post
-      put :skip_vote
-      delete :skip_vote, action: :unskip_vote
-      get :post_selection_weights
     end
 
-    resources :comments, controller: :theatre_comments, only: [:index, :create, :destroy]
-    resources :programmes, controller: :theatre_programmes, only: [:index]
-    resources :skip_events, controller: :theatre_skip_events, only: [:index]
+    resources :comments, controller: :theatre_comments, only: [:index, :create]
   end
 
   resources :materials, only: [:index, :show, :create, :update, :destroy]

backend/config/schedule.rb

@@ -1,27 +1,12 @@
 env :PATH, '/root/.rbenv/shims:/root/.rbenv/bin:/usr/local/bin:/usr/bin:/bin'
 
-set :path, '/var/www/btrc-hub/backend'
-set :environment, 'production'
 set :output, standard: '/var/log/btrc_hub_nico_sync.log',
              error:    '/var/log/btrc_hub_nico_sync_err.log'
 
-job_type :rake,
-         'cd :path && set -a && . /etc/btrc-hub/backend.env && set +a && ' \
-         ':environment_variable=:environment bundle exec rake :task --silent :output'
-
-every 1.day, at: '11:00 am' do
+every 1.day, at: '3:00 pm' do
   rake 'nico:sync', environment: 'production'
 end
 
 every 1.day, at: '0:00 am' do
   rake 'post_similarity:calc', environment: 'production'
-  rake 'tag_similarity:calc', environment: 'production'
-end
-
-every 1.day, at: '7:50 am' do
-  rake 'nico:export', environment: 'production'
-end
-
-every :hour do
-  rake 'post:sync', environment: 'production'
 end

backend/db/migrate/20260409123700_create_post_versions.rb

@@ -2,15 +2,15 @@ require 'set'
 
 
 class CreatePostVersions < ActiveRecord::Migration[8.0]
-  class Post < ActiveRecord::Base
+  class Post < ApplicationRecord
     self.table_name = 'posts'
   end
 
-  class PostTag < ActiveRecord::Base
+  class PostTag < ApplicationRecord
     self.table_name = 'post_tags'
   end
 
-  class PostVersion < ActiveRecord::Base
+  class PostVersion < ApplicationRecord
     self.table_name = 'post_versions'
   end
 

backend/db/migrate/20260419035400_create_tag_versions.rb

@@ -1,156 +0,0 @@
-class CreateTagVersions < ActiveRecord::Migration[8.0]
-  class Tag < ActiveRecord::Base
-    self.table_name = 'tags'
-  end
-
-  class TagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  class TagImplication < ActiveRecord::Base
-    self.table_name = 'tag_implications'
-  end
-
-  class TagVersion < ActiveRecord::Base
-    self.table_name = 'tag_versions'
-  end
-
-  class NicoTagVersion < ActiveRecord::Base
-    self.table_name = 'nico_tag_versions'
-  end
-
-  class NicoTagRelation < ActiveRecord::Base
-    self.table_name = 'nico_tag_relations'
-  end
-
-  def up
-    create_table :tag_versions do |t|
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :name, null: false
-      t.string :category, null: false
-      t.text :aliases, null: false
-      t.text :parent_tag_ids, null: false
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }, index: false
-
-      t.index [:tag_id, :version_no], unique: true
-      t.index :created_at
-      t.index [:tag_id, :created_at], order: { created_at: :desc }
-      t.index [:created_by_user_id, :created_at], order: { created_at: :desc }
-      t.check_constraint 'version_no > 0',
-                         name: 'tag_versions_version_no_positive'
-    end
-
-    create_table :nico_tag_versions do |t|
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :name, null: false
-      t.text :linked_tags, null: false
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }, index: false
-
-      t.index [:tag_id, :version_no], unique: true
-      t.index :created_at
-      t.index [:tag_id, :created_at], order: { created_at: :desc }
-      t.index [:created_by_user_id, :created_at], order: { created_at: :desc }
-      t.check_constraint 'version_no > 0',
-                         name: 'nico_tag_versions_version_no_positive'
-    end
-
-    TagVersion.reset_column_information
-    say_with_time 'Backfilling tag_versions' do
-      Tag.where(discarded_at: nil)
-         .where.not(category: 'nico')
-         .find_in_batches(batch_size: 500) do |tags|
-        tag_ids = tags.map(&:id)
-
-        tag_implication_rows_by_tag_id =
-            TagImplication
-            .where(tag_id: tag_ids)
-            .pluck(:tag_id, :parent_tag_id)
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        tag_name_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.id')
-            .where(tags: { id: tag_ids })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object({ }) do |row, h|
-              h[row[0]] = row[1]
-            end
-
-        tag_alias_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.canonical_id')
-            .where(tags: { id: tag_ids })
-            .where(tag_names: { discarded_at: nil })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        TagVersion.insert_all(tags.map { |tag|
-          { tag_id: tag.id,
-            version_no: 1,
-            event_type: 'create',
-            name: tag_name_rows_by_tag_id[tag.id],
-            category: tag.category,
-            aliases: tag_alias_rows_by_tag_id[tag.id].sort.join(' '),
-            parent_tag_ids: tag_implication_rows_by_tag_id[tag.id].sort.join(' '),
-            created_at: tag.created_at,
-            created_by_user_id: nil }
-        })
-      end
-    end
-
-    NicoTagVersion.reset_column_information
-    say_with_time 'Backfilling nico_tag_versions' do
-      Tag.where(discarded_at: nil, category: 'nico')
-         .find_in_batches(batch_size: 500) do |tags|
-        tag_ids = tags.map(&:id)
-
-        tag_name_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.id')
-            .where(tags: { id: tag_ids })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object({ }) do |row, h|
-              h[row[0]] = row[1]
-            end
-
-        nico_tag_relation_rows_by_tag_id =
-            NicoTagRelation
-            .joins('INNER JOIN tags nico_tags ON nico_tags.id = nico_tag_relations.nico_tag_id')
-            .joins('INNER JOIN tags linked_tags ON linked_tags.id = nico_tag_relations.tag_id')
-            .joins('INNER JOIN tag_names ON tag_names.id = linked_tags.tag_name_id')
-            .where(nico_tags: { id: tag_ids })
-            .where(linked_tags: { discarded_at: nil })
-            .where(tag_names: { discarded_at: nil })
-            .pluck('nico_tags.id', 'tag_names.name')
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        NicoTagVersion.insert_all(tags.map { |tag|
-          { tag_id: tag.id,
-            version_no: 1,
-            event_type: 'create',
-            name: tag_name_rows_by_tag_id[tag.id],
-            linked_tags: nico_tag_relation_rows_by_tag_id[tag.id].sort.join(' '),
-            created_at: tag.created_at,
-            created_by_user_id: nil }
-        })
-      end
-    end
-  end
-
-  def down
-    drop_table :nico_tag_versions
-    drop_table :tag_versions
-  end
-end

backend/db/migrate/20260426120600_create_wiki_versions.rb

@@ -1,91 +0,0 @@
-class CreateWikiVersions < ActiveRecord::Migration[8.0]
-  class WikiPage < ActiveRecord::Base
-    self.table_name = 'wiki_pages'
-  end
-
-  class WikiRevision < ActiveRecord::Base
-    self.table_name = 'wiki_revisions'
-  end
-
-  class WikiRevisionLine < ActiveRecord::Base
-    self.table_name = 'wiki_revision_lines'
-  end
-
-  class WikiLine < ActiveRecord::Base
-    self.table_name = 'wiki_lines'
-  end
-
-  class WikiVersion < ActiveRecord::Base
-    self.table_name = 'wiki_versions'
-  end
-
-  class TagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  def up
-    add_column :wiki_pages, :body, :text, after: :tag_name_id
-
-    create_table :wiki_versions do |t|
-      t.references :wiki_page, null: false, foreign_key: true
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :title, null: false
-      t.text :body, null: false
-      t.text :reason
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }
-
-      t.index [:wiki_page_id, :version_no], unique: true
-      t.check_constraint 'version_no > 0',
-                         name: 'wiki_versions_version_no_positive'
-      t.check_constraint "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: 'wiki_versions_event_type_valid'
-    end
-
-    WikiPage.reset_column_information
-    WikiVersion.reset_column_information
-
-    say_with_time 'Backfilling wiki_versions' do
-      WikiPage.find_each do |page|
-        base_revision_id = nil
-        version_no = 1
-        title = TagName.find(page.tag_name_id).name
-        body = nil
-        loop do
-          rev = WikiRevision.where(wiki_page_id: page.id).find_by(base_revision_id:)
-          break unless rev
-
-          body = WikiRevisionLine.where(wiki_revision_id: rev.id).order(:position).map { |wrl|
-            WikiLine.find(wrl.wiki_line_id).body
-          }.join("\n")
-
-          WikiVersion.create!(
-              wiki_page_id: page.id,
-              version_no:,
-              event_type: version_no == 1 ? 'create' : 'update',
-              title:,
-              body:,
-              reason: rev.message,
-              created_at: rev.created_at,
-              created_by_user_id: rev.created_user_id)
-
-          version_no += 1
-          base_revision_id = rev.id
-        end
-        if body
-          page.update!(body:)
-        else
-          page.destroy!
-        end
-      end
-    end
-
-    change_column_null :wiki_pages, :body, false
-  end
-
-  def down
-    drop_table :wiki_versions
-    remove_column :wiki_pages, :body
-  end
-end

backend/db/migrate/20260427214800_create_post_implications.rb

@@ -1,24 +0,0 @@
-class CreatePostImplications < ActiveRecord::Migration[8.0]
-  def up
-    create_table :post_implications, primary_key: [:post_id, :parent_post_id] do |t|
-      t.references :post, null: false, foreign_key: true, index: false
-      t.references :parent_post, null: false, foreign_key: { to_table: :posts }
-      t.timestamps
-
-      t.check_constraint 'post_id <> parent_post_id',
-                         name: 'chk_post_implications_no_self'
-    end
-
-    add_column :post_versions, :parent_post_ids, :text, null: false, after: :parent_id
-    remove_column :post_versions, :parent_id, :bigint
-    remove_reference :posts, :parent, foreign_key: { to_table: :posts }
-  end
-
-  def down
-    add_reference :posts, :parent, foreign_key: { to_table: :posts }, after: :thumbnail_base
-    add_column :post_versions, :parent_id, :bigint, after: :post_id
-    remove_column :post_versions, :parent_post_ids, :text
-
-    drop_table :post_implications
-  end
-end

backend/db/migrate/20260501153900_rename_banned_to_banned_at_in_users_and_ip_addresses.rb

@@ -1,16 +0,0 @@
-class RenameBannedToBannedAtInUsersAndIpAddresses < ActiveRecord::Migration[8.0]
-  def up
-    [:users, :ip_addresses].each do
-      add_column _1, :banned_at, :datetime, after: :banned
-      add_index _1, :banned_at
-      remove_column _1, :banned
-    end
-  end
-
-  def down
-    [:ip_addresses, :users].each do
-      add_column _1, :banned, :boolean, null: false, default: false, after: :banned_at
-      remove_column _1, :banned_at
-    end
-  end
-end

backend/db/migrate/20260507124000_add_version_no_to_posts.rb

@@ -1,27 +0,0 @@
-class AddVersionNoToPosts < ActiveRecord::Migration[8.0]
-  def up
-    add_column :posts, :version_no, :integer
-
-    execute <<~SQL
-      UPDATE
-        posts
-      SET
-        version_no = (
-          SELECT
-            MAX(version_no)
-          FROM
-            post_versions
-          WHERE
-            post_id = posts.id)
-    SQL
-
-    change_column_null :posts, :version_no, false
-
-    add_check_constraint :posts, 'version_no > 0', name: 'chk_posts_version_no_positive'
-  end
-
-  def down
-    remove_check_constraint :posts, name: 'chk_posts_version_no_positive'
-    remove_column :posts, :version_no
-  end
-end

backend/db/migrate/20260507211600_add_version_no_to_tags.rb

@@ -1,37 +0,0 @@
-class AddVersionNoToTags < ActiveRecord::Migration[8.0]
-  def up
-    add_column :tags, :version_no, :integer
-
-    execute <<~SQL
-      UPDATE
-        tags
-      SET
-        version_no = (
-          CASE category
-          WHEN 'nico' THEN
-            (SELECT
-               MAX(version_no)
-             FROM
-               nico_tag_versions
-             WHERE
-               tag_id = tags.id)
-          ELSE
-            (SELECT
-               MAX(version_no)
-             FROM
-               tag_versions
-             WHERE
-               tag_id = tags.id)
-          END)
-    SQL
-
-    change_column_null :tags, :version_no, false
-
-    add_check_constraint :tags, 'version_no > 0', name: 'chk_tags_version_no_positive'
-  end
-
-  def down
-    remove_check_constraint :tags, name: 'chk_tags_version_no_positive'
-    remove_column :tags, :version_no
-  end
-end

backend/db/migrate/20260507213300_add_version_no_to_wiki_pages.rb

@@ -1,27 +0,0 @@
-class AddVersionNoToWikiPages < ActiveRecord::Migration[8.0]
-  def up
-    add_column :wiki_pages, :version_no, :integer
-
-    execute <<~SQL
-      UPDATE
-        wiki_pages
-      SET
-        version_no = (
-          SELECT
-            MAX(version_no)
-          FROM
-            wiki_versions
-          WHERE
-            wiki_page_id = wiki_pages.id)
-    SQL
-
-    change_column_null :wiki_pages, :version_no, false
-
-    add_check_constraint :wiki_pages, 'version_no > 0', name: 'chk_wiki_pages_version_no_positive'
-  end
-
-  def down
-    remove_check_constraint :wiki_pages, name: 'chk_wiki_pages_version_no_positive'
-    remove_column :wiki_pages, :version_no
-  end
-end

backend/db/migrate/20260514221900_create_theatre_programmes.rb

@@ -1,10 +0,0 @@
-class CreateTheatreProgrammes < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_programmes, primary_key: [:theatre_id, :position] do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.integer :position, null: false
-      t.references :post, null: false, foreign_key: true
-      t.datetime :created_at, null: false
-    end
-  end
-end

backend/db/migrate/20260606000000_create_theatre_skip_votes_and_events.rb

@@ -1,36 +0,0 @@
-class CreateTheatreSkipVotesAndEvents < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_skip_votes, primary_key: [:theatre_id, :post_id, :user_id] do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.references :post, null: false, foreign_key: true
-      t.references :user, null: false, foreign_key: true
-      t.timestamps
-    end
-
-    create_table :theatre_skip_events do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.references :post, null: false, foreign_key: true
-      t.references :skipped_by_user, null: false, foreign_key: { to_table: :users }
-      t.integer :programme_position
-      t.datetime :created_at, null: false
-    end
-
-    create_table :theatre_skip_event_voters, primary_key: [:theatre_skip_event_id, :user_id] do |t|
-      t.references :theatre_skip_event, null: false, foreign_key: true
-      t.references :user, null: false, foreign_key: true
-    end
-
-    create_table :theatre_skip_event_tags, primary_key: [:theatre_skip_event_id, :tag_id] do |t|
-      t.references :theatre_skip_event, null: false, foreign_key: true
-      t.references :tag, null: false, foreign_key: true
-    end
-
-    add_index :theatre_skip_events, [:theatre_id, :created_at]
-    add_index :theatre_skip_votes, [:theatre_id, :post_id, :created_at],
-              name: 'idx_theatre_skip_votes_theatre_post_created'
-    add_index :theatre_skip_event_voters, [:user_id, :theatre_skip_event_id],
-              name: 'idx_theatre_skip_event_voters_user_event'
-    add_index :theatre_skip_event_tags, [:tag_id, :theatre_skip_event_id],
-              name: 'idx_theatre_skip_event_tags_tag_event'
-  end
-end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_04_09_123700) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -50,10 +50,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
 
   create_table "ip_addresses", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.binary "ip_address", limit: 16, null: false
-    t.datetime "banned_at"
+    t.boolean "banned", default: false, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["banned_at"], name: "index_ip_addresses_on_banned_at"
     t.index ["ip_address"], name: "index_ip_addresses_on_ip_address", unique: true
   end
 
@@ -105,30 +104,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.index ["tag_id"], name: "index_nico_tag_relations_on_tag_id"
   end
 
-  create_table "nico_tag_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "name", null: false
-    t.text "linked_tags", null: false
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_at"], name: "index_nico_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_nico_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_nico_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "version_no"], name: "index_nico_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "nico_tag_versions_version_no_positive"
-  end
-
-  create_table "post_implications", primary_key: ["post_id", "parent_post_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "post_id", null: false
-    t.bigint "parent_post_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["parent_post_id"], name: "index_post_implications_on_parent_post_id"
-    t.check_constraint "`post_id` <> `parent_post_id`", name: "chk_post_implications_no_self"
-  end
-
   create_table "post_similarities", primary_key: ["post_id", "target_post_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.bigint "target_post_id", null: false
@@ -165,12 +140,13 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.string "url", limit: 768, null: false
     t.string "thumbnail_base", limit: 2000
     t.text "tags", null: false
-    t.text "parent_post_ids", null: false
+    t.bigint "parent_id"
     t.datetime "original_created_from"
     t.datetime "original_created_before"
     t.datetime "created_at", null: false
     t.bigint "created_by_user_id"
     t.index ["created_by_user_id"], name: "index_post_versions_on_created_by_user_id"
+    t.index ["parent_id"], name: "index_post_versions_on_parent_id"
     t.index ["post_id", "version_no"], name: "index_post_versions_on_post_id_and_version_no", unique: true
     t.index ["post_id"], name: "index_post_versions_on_post_id"
     t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "post_versions_event_type_valid"
@@ -181,15 +157,15 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.string "title"
     t.string "url", limit: 768, null: false
     t.string "thumbnail_base", limit: 2000
+    t.bigint "parent_id"
     t.bigint "uploaded_user_id"
     t.datetime "created_at", null: false
     t.datetime "original_created_from"
     t.datetime "original_created_before"
     t.datetime "updated_at", null: false
-    t.integer "version_no", null: false
+    t.index ["parent_id"], name: "index_posts_on_parent_id"
     t.index ["uploaded_user_id"], name: "index_posts_on_uploaded_user_id"
     t.index ["url"], name: "index_posts_on_url", unique: true
-    t.check_constraint "`version_no` > 0", name: "chk_posts_version_no_positive"
   end
 
   create_table "settings", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -240,23 +216,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.index ["target_tag_id"], name: "index_tag_similarities_on_target_tag_id"
   end
 
-  create_table "tag_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "name", null: false
-    t.string "category", null: false
-    t.text "aliases", null: false
-    t.text "parent_tag_ids", null: false
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_at"], name: "index_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "version_no"], name: "index_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "tag_versions_version_no_positive"
-  end
-
   create_table "tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "tag_name_id", null: false
     t.string "category", default: "general", null: false
@@ -264,10 +223,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.datetime "updated_at", null: false
     t.integer "post_count", default: 0, null: false
     t.datetime "discarded_at"
-    t.integer "version_no", null: false
     t.index ["discarded_at"], name: "index_tags_on_discarded_at"
     t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
-    t.check_constraint "`version_no` > 0", name: "chk_tags_version_no_positive"
   end
 
   create_table "theatre_comments", primary_key: ["theatre_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -283,55 +240,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.index ["user_id"], name: "index_theatre_comments_on_user_id"
   end
 
-  create_table "theatre_programmes", primary_key: ["theatre_id", "position"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.integer "position", null: false
-    t.bigint "post_id", null: false
-    t.datetime "created_at", null: false
-    t.index ["post_id"], name: "index_theatre_programmes_on_post_id"
-    t.index ["theatre_id"], name: "index_theatre_programmes_on_theatre_id"
-  end
-
-  create_table "theatre_skip_event_tags", primary_key: ["theatre_skip_event_id", "tag_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_skip_event_id", null: false
-    t.bigint "tag_id", null: false
-    t.index ["tag_id", "theatre_skip_event_id"], name: "idx_theatre_skip_event_tags_tag_event"
-    t.index ["tag_id"], name: "index_theatre_skip_event_tags_on_tag_id"
-    t.index ["theatre_skip_event_id"], name: "index_theatre_skip_event_tags_on_theatre_skip_event_id"
-  end
-
-  create_table "theatre_skip_event_voters", primary_key: ["theatre_skip_event_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_skip_event_id", null: false
-    t.bigint "user_id", null: false
-    t.index ["theatre_skip_event_id"], name: "index_theatre_skip_event_voters_on_theatre_skip_event_id"
-    t.index ["user_id", "theatre_skip_event_id"], name: "idx_theatre_skip_event_voters_user_event"
-    t.index ["user_id"], name: "index_theatre_skip_event_voters_on_user_id"
-  end
-
-  create_table "theatre_skip_events", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.bigint "post_id", null: false
-    t.bigint "skipped_by_user_id", null: false
-    t.integer "programme_position"
-    t.datetime "created_at", null: false
-    t.index ["post_id"], name: "index_theatre_skip_events_on_post_id"
-    t.index ["skipped_by_user_id"], name: "index_theatre_skip_events_on_skipped_by_user_id"
-    t.index ["theatre_id", "created_at"], name: "index_theatre_skip_events_on_theatre_id_and_created_at"
-    t.index ["theatre_id"], name: "index_theatre_skip_events_on_theatre_id"
-  end
-
-  create_table "theatre_skip_votes", primary_key: ["theatre_id", "post_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.bigint "post_id", null: false
-    t.bigint "user_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["post_id"], name: "index_theatre_skip_votes_on_post_id"
-    t.index ["theatre_id", "post_id", "created_at"], name: "idx_theatre_skip_votes_theatre_post_created"
-    t.index ["theatre_id"], name: "index_theatre_skip_votes_on_theatre_id"
-    t.index ["user_id"], name: "index_theatre_skip_votes_on_user_id"
-  end
-
   create_table "theatre_watching_users", primary_key: ["theatre_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "theatre_id", null: false
     t.bigint "user_id", null: false
@@ -386,10 +294,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.string "name"
     t.string "inheritance_code", limit: 64, null: false
     t.string "role", null: false
-    t.datetime "banned_at"
+    t.boolean "banned", default: false, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["banned_at"], name: "index_users_on_banned_at"
   end
 
   create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -415,19 +322,16 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
 
   create_table "wiki_pages", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "tag_name_id", null: false
-    t.text "body", null: false
     t.bigint "created_user_id", null: false
     t.bigint "updated_user_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
     t.integer "next_asset_no", default: 1, null: false
-    t.integer "version_no", null: false
     t.index ["created_user_id"], name: "index_wiki_pages_on_created_user_id"
     t.index ["discarded_at"], name: "index_wiki_pages_on_discarded_at"
     t.index ["tag_name_id"], name: "index_wiki_pages_on_tag_name_id", unique: true
     t.index ["updated_user_id"], name: "index_wiki_pages_on_updated_user_id"
-    t.check_constraint "`version_no` > 0", name: "chk_wiki_pages_version_no_positive"
   end
 
   create_table "wiki_revision_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -460,22 +364,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
     t.index ["wiki_page_id"], name: "index_wiki_revisions_on_wiki_page_id"
   end
 
-  create_table "wiki_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "wiki_page_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "title", null: false
-    t.text "body", null: false
-    t.text "reason"
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_by_user_id"], name: "index_wiki_versions_on_created_by_user_id"
-    t.index ["wiki_page_id", "version_no"], name: "index_wiki_versions_on_wiki_page_id_and_version_no", unique: true
-    t.index ["wiki_page_id"], name: "index_wiki_versions_on_wiki_page_id"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "wiki_versions_event_type_valid"
-    t.check_constraint "`version_no` > 0", name: "wiki_versions_version_no_positive"
-  end
-
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "material_versions", "materials"
@@ -489,10 +377,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
   add_foreign_key "materials", "users", column: "updated_by_user_id"
   add_foreign_key "nico_tag_relations", "tags"
   add_foreign_key "nico_tag_relations", "tags", column: "nico_tag_id"
-  add_foreign_key "nico_tag_versions", "tags"
-  add_foreign_key "nico_tag_versions", "users", column: "created_by_user_id"
-  add_foreign_key "post_implications", "posts"
-  add_foreign_key "post_implications", "posts", column: "parent_post_id"
   add_foreign_key "post_similarities", "posts"
   add_foreign_key "post_similarities", "posts", column: "target_post_id"
   add_foreign_key "post_tags", "posts"
@@ -500,7 +384,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
   add_foreign_key "post_tags", "users", column: "created_user_id"
   add_foreign_key "post_tags", "users", column: "deleted_user_id"
   add_foreign_key "post_versions", "posts"
+  add_foreign_key "post_versions", "posts", column: "parent_id"
   add_foreign_key "post_versions", "users", column: "created_by_user_id"
+  add_foreign_key "posts", "posts", column: "parent_id"
   add_foreign_key "posts", "users", column: "uploaded_user_id"
   add_foreign_key "settings", "users"
   add_foreign_key "tag_implications", "tags"
@@ -508,23 +394,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
   add_foreign_key "tag_names", "tag_names", column: "canonical_id"
   add_foreign_key "tag_similarities", "tags"
   add_foreign_key "tag_similarities", "tags", column: "target_tag_id"
-  add_foreign_key "tag_versions", "tags"
-  add_foreign_key "tag_versions", "users", column: "created_by_user_id"
   add_foreign_key "tags", "tag_names"
   add_foreign_key "theatre_comments", "theatres"
   add_foreign_key "theatre_comments", "users"
-  add_foreign_key "theatre_programmes", "posts"
-  add_foreign_key "theatre_programmes", "theatres"
-  add_foreign_key "theatre_skip_event_tags", "tags"
-  add_foreign_key "theatre_skip_event_tags", "theatre_skip_events"
-  add_foreign_key "theatre_skip_event_voters", "theatre_skip_events"
-  add_foreign_key "theatre_skip_event_voters", "users"
-  add_foreign_key "theatre_skip_events", "posts"
-  add_foreign_key "theatre_skip_events", "theatres"
-  add_foreign_key "theatre_skip_events", "users", column: "skipped_by_user_id"
-  add_foreign_key "theatre_skip_votes", "posts"
-  add_foreign_key "theatre_skip_votes", "theatres"
-  add_foreign_key "theatre_skip_votes", "users"
   add_foreign_key "theatre_watching_users", "theatres"
   add_foreign_key "theatre_watching_users", "users"
   add_foreign_key "theatres", "posts", column: "current_post_id"
@@ -545,6 +417,4 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) do
   add_foreign_key "wiki_revisions", "wiki_pages"
   add_foreign_key "wiki_revisions", "wiki_pages", column: "redirect_page_id"
   add_foreign_key "wiki_revisions", "wiki_revisions", column: "base_revision_id"
-  add_foreign_key "wiki_versions", "users", column: "created_by_user_id"
-  add_foreign_key "wiki_versions", "wiki_pages"
 end

backend/lib/tasks/export_nico.rake

@@ -1,23 +0,0 @@
-namespace :nico do
-  desc 'ニコニコ DB 逆連携'
-  task export: :environment do
-    require 'open3'
-
-    mysql_user = ENV.fetch('MYSQL_USER')
-    mysql_pass = ENV.fetch('MYSQL_PASS')
-    nizika_nico_path = ENV.fetch('NIZIKA_NICO_PATH')
-
-    videos = Post.where('url LIKE ?', '%nicovideo.jp/watch/%').pluck(:url).filter_map {
-      _1[%r{nicovideo\.jp/watch/([^/?#]+)}, 1]
-    }.uniq
-
-    next if videos.empty?
-
-    _, stderr, status = Open3.capture3(
-        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
-        'python3', '-m', 'tracked_videos.put_bulk_upsert', *videos,
-        chdir: nizika_nico_path)
-
-    raise stderr unless status.success?
-  end
-end

backend/lib/tasks/sync_nico.rake

@@ -115,10 +115,6 @@ namespace :nico do
       datum['tags'].each do |raw|
         name = TagNameSanitisationRule.sanitise("nico:#{ raw }")
         tag = Tag.find_or_create_by_tag_name!(name, category: :nico)
-
-        event_type = tag.nico_tag_versions.exists? ? :update : :create
-        NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user: nil)
-
         desired_nico_tag_based_ids << tag.id
 
         # 新たに記載される外部タグと連携される内部タグを記載
@@ -153,7 +149,6 @@ namespace :nico do
       if post_created
         PostVersionRecorder.record!(post:, event_type: :create, created_by_user: nil)
       elsif post_changed || kept_tag_ids != desired_all_tag_ids.to_set
-        PostVersionRecorder.ensure_snapshot!(post, created_by_user: nil)
         PostVersionRecorder.record!(post:, event_type: :update, created_by_user: nil)
       end
     end

backend/lib/tasks/sync_posts.rake

@@ -1,6 +0,0 @@
-namespace :post do
-  desc '投稿同期（ニコニコ以外）'
-  task sync: :environment do
-    Youtube::Sync.new.sync!
-  end
-end

backend/spec/factories/ip_addresses.rb

@@ -1,10 +0,0 @@
-FactoryBot.define do
-  factory :ip_address do
-    ip_address { IPAddr.new('203.0.113.10').hton }
-    banned_at { nil }
-
-    trait :banned do
-      banned_at { Time.current }
-    end
-  end
-end

backend/spec/factories/users.rb

@@ -1,24 +1,15 @@
 FactoryBot.define do
   factory :user do
-    name { nil }
+    name { "test-user" }
     inheritance_code { SecureRandom.uuid }
-    role { 'guest' }
-    banned_at { nil }
-
-    trait :guest do
-      role { 'guest' }
-    end
+    role { "guest" }
 
     trait :member do
-      role { 'member' }
+      role { "member" }
     end
 
     trait :admin do
       role { 'admin' }
     end
-
-    trait :banned do
-      banned_at { Time.current }
-    end
   end
 end

backend/spec/factories/wiki_pages.rb

@@ -3,7 +3,5 @@ FactoryBot.define do
     title { "TestPage" }
     association :created_user, factory: :user
     association :updated_user, factory: :user
-
-    body { ' ' }
   end
 end

backend/spec/models/post_implication_spec.rb

@@ -1,51 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe PostImplication, type: :model do
-  let!(:post_record) do
-    Post.create!(
-      title: 'post',
-      url: 'https://example.com/post-implication-post'
-    )
-  end
-
-  let!(:parent_post) do
-    Post.create!(
-      title: 'parent post',
-      url: 'https://example.com/post-implication-parent'
-    )
-  end
-
-  it 'is valid with post and parent_post' do
-    implication = described_class.new(
-      post: post_record,
-      parent_post:
-    )
-
-    expect(implication).to be_valid
-  end
-
-  it 'does not allow same post as parent_post' do
-    implication = described_class.new(
-      post: post_record,
-      parent_post: post_record
-    )
-
-    expect(implication).not_to be_valid
-    expect(implication.errors[:parent_post_id]).to be_present
-  end
-
-  it 'does not allow duplicate pair' do
-    described_class.create!(
-      post: post_record,
-      parent_post:
-    )
-
-    duplicate = described_class.new(
-      post: post_record,
-      parent_post:
-    )
-
-    expect(duplicate).not_to be_valid
-    expect(duplicate.errors[:post_id]).to be_present
-  end
-end

backend/spec/models/post_version_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe PostVersion, type: :model do
       url: post_record.url,
       thumbnail_base: post_record.thumbnail_base,
       tags: post_record.snapshot_tag_names.join(' '),
-      parent_post_ids: post_record.snapshot_parent_post_ids.join(' '),
+      parent: post_record.parent,
       original_created_from: post_record.original_created_from,
       original_created_before: post_record.original_created_before,
       created_at: Time.current,

backend/spec/models/tag_spec.rb

@@ -107,13 +107,11 @@ RSpec.describe Tag, type: :model do
     context 'when the source tag_name has a wiki_page' do
       let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
       let!(:wiki_page) do
-        admin = create_admin_user!
-
-        Wiki::Commit.create_content!(
-            tag_name: source_tag_name,
-            body: 'source wiki body',
-            created_by_user: admin,
-            message: 'init')
+        WikiPage.create!(
+          tag_name: source_tag_name,
+          created_user: create_admin_user!,
+          updated_user: create_admin_user!
+        )
       end
 
       it 'rolls back the transaction' do
@@ -161,7 +159,7 @@ RSpec.describe Tag, type: :model do
         url: post.url,
         thumbnail_base: post.thumbnail_base,
         tags: snapshot_tags(post),
-        parent_post_ids: post.snapshot_parent_post_ids.join(' '),
+        parent: post.parent,
         original_created_from: post.original_created_from,
         original_created_before: post.original_created_before,
         created_at: Time.current,

backend/spec/models/version_record_spec.rb

@@ -1,74 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe VersionRecord, type: :model do
-  let!(:tag) { create(:tag, name: 'version_record_tag') }
-  let!(:nico_tag) { create(:tag, :nico, name: 'nico:version_record_tag') }
-
-  it 'makes TagVersion read only after create' do
-    version = TagVersion.create!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: tag.name,
-      category: tag.category,
-      aliases: '',
-      parent_tag_ids: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.update!(name: 'changed')
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'prevents TagVersion destroy' do
-    version = TagVersion.create!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: tag.name,
-      category: tag.category,
-      aliases: '',
-      parent_tag_ids: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.destroy!
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'makes NicoTagVersion read only after create' do
-    version = NicoTagVersion.create!(
-      tag: nico_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: nico_tag.name,
-      linked_tags: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.update!(name: 'nico:changed')
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'prevents NicoTagVersion destroy' do
-    version = NicoTagVersion.create!(
-      tag: nico_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: nico_tag.name,
-      linked_tags: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.destroy!
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-end

backend/spec/requests/error_responses_spec.rb

@@ -1,47 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'error responses', type: :request do
-  describe 'manual input errors' do
-    it 'returns a stable payload for bad requests' do
-      get '/tags/name/%20/deerjikists'
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json).to include(
-          'type' => 'bad_request',
-          'message' => be_present,
-          'errors' => {},
-          'base_errors' => [be_present])
-    end
-
-    it 'returns a stable field-error payload for unprocessable requests' do
-      member = create(:user, :member)
-      tag = create(:tag, :general, name: 'error_response_tag')
-      sign_in_as(member)
-
-      patch "/tags/#{ tag.id }", params: { category: 'nico' }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include(
-          'type' => 'validation_error',
-          'message' => '入力内容を確認してください．',
-          'base_errors' => [])
-      expect(json.fetch('errors')).to include(
-          'category' => ['ニコタグは変更できません．'])
-    end
-  end
-
-  describe 'model validation errors' do
-    it 'returns field messages for model errors' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: 'a' * 256 }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include(
-          'type' => 'validation_error',
-          'message' => '入力内容を確認してください．')
-      expect(json.fetch('errors').fetch('name')).to include(be_present)
-    end
-  end
-end

backend/spec/requests/materials_spec.rb

@@ -141,21 +141,16 @@ RSpec.describe 'Materials API', type: :request do
     context 'when logged in' do
       before { sign_in_as(guest_user) }
 
-      it 'returns 422 when tag is blank' do
+      it 'returns 400 when tag is blank' do
         post '/materials', params: { tag: '   ', file: dummy_upload }
 
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-            'tag' => ['タグは必須です．'])
+        expect(response).to have_http_status(:bad_request)
       end
 
-      it 'returns 422 when both file and url are blank' do
+      it 'returns 400 when both file and url are blank' do
         post '/materials', params: { tag: 'material_create_blank' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-            'file' => ['ファイルまたは URL は必須です．'],
-            'url' => ['ファイルまたは URL は必須です．'])
+        expect(response).to have_http_status(:bad_request)
       end
 
       it 'creates a material with an attached file' do
@@ -266,26 +261,21 @@ RSpec.describe 'Materials API', type: :request do
         expect(response).to have_http_status(:not_found)
       end
 
-      it 'returns 422 when tag is blank' do
+      it 'returns 400 when tag is blank' do
         put "/materials/#{ material.id }", params: {
           tag: '   ',
           file: dummy_upload
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-            'tag' => ['タグは必須です．'])
+        expect(response).to have_http_status(:bad_request)
       end
 
-      it 'returns 422 when both file and url are blank' do
+      it 'returns 400 when both file and url are blank' do
         put "/materials/#{ material.id }", params: {
           tag: 'material_update_no_payload'
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-            'file' => ['ファイルまたは URL は必須です．'],
-            'url' => ['ファイルまたは URL は必須です．'])
+        expect(response).to have_http_status(:bad_request)
       end
 
       it 'updates tag, url, file, and updated_by_user' do

backend/spec/requests/nico_tags_spec.rb

@@ -3,74 +3,17 @@ require 'rails_helper'
 
 RSpec.describe 'NicoTags', type: :request do
   describe 'GET /tags/nico' do
-    it 'returns paginated tags and total count' do
-      create_list(:tag, 3, :nico)
-
-      get '/tags/nico', params: { page: 2, limit: 2 }
-
+    it 'returns tags and next_cursor when overflowing limit' do
+      create_list(:tag, 21, :nico)
+      get '/tags/nico', params: { limit: 20 }
       expect(response).to have_http_status(:ok)
-      expect(json['tags'].size).to eq(1)
-      expect(json['count']).to eq(3)
-    end
-
-    it 'filters by nico tag name, linked tag name, and link status' do
-      linked = create(:tag, :nico)
-      linked.tag_name.update!(name: 'nico:search_linked')
-      unlinked = create(:tag, :nico)
-      unlinked.tag_name.update!(name: 'nico:search_unlinked')
-      other = create(:tag, :nico)
-      other.tag_name.update!(name: 'nico:other')
-      destination = create(:tag, :general)
-      destination.tag_name.update!(name: 'destination_search')
-      NicoTagRelation.create!(nico_tag: linked, tag: destination)
-      NicoTagRelation.create!(nico_tag: other, tag: create(:tag, :general))
-
-      get '/tags/nico', params: {
-        name: 'search_',
-        linked_tag: 'destination_',
-        link_status: 'linked'
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(1)
-      expect(json.fetch('tags').map { |tag| tag['id'] }).to eq([linked.id])
-
-      get '/tags/nico', params: { name: 'search_', link_status: 'unlinked' }
-
-      expect(json['count']).to eq(1)
-      expect(json.fetch('tags').map { |tag| tag['id'] }).to eq([unlinked.id])
-    end
-
-    it 'sorts by name and timestamps' do
-      older = create(:tag, :nico)
-      older.tag_name.update!(name: 'nico:a')
-      older.update_columns(created_at: 2.days.ago)
-      newer = create(:tag, :nico)
-      newer.tag_name.update!(name: 'nico:b')
-      newer.update_columns(created_at: 1.day.ago)
-      older_post_tag =
-        PostTag.create!(post: Post.create!(url: 'https://example.com/nico-older'), tag: older)
-      older_post_tag.update_columns(created_at: 1.hour.ago)
-      newer_post_tag =
-        PostTag.create!(post: Post.create!(url: 'https://example.com/nico-newer'), tag: newer)
-      newer_post_tag.update_columns(created_at: 2.hours.ago)
-
-      get '/tags/nico', params: { order: 'name:desc' }
-      expect(json.fetch('tags').map { |tag| tag['id'] }).to eq([newer.id, older.id])
-
-      get '/tags/nico', params: { order: 'created_at:asc' }
-      expect(json.fetch('tags').map { |tag| tag['id'] }).to eq([older.id, newer.id])
-
-      get '/tags/nico', params: { order: 'updated_at:desc' }
-      expect(json.fetch('tags').map { |tag| tag['id'] }).to eq([older.id, newer.id])
-      expect(Time.zone.parse(json.fetch('tags').first.fetch('recent_post_tag_created_at')))
-        .to be_within(1.second).of(older_post_tag.created_at)
+      expect(json['tags'].size).to eq(20)
+      expect(json['next_cursor']).to be_present
     end
   end
 
   describe 'PATCH /tags/nico/:id' do
     let(:member) { create(:user, :member) }
-    let(:admin) { create(:user, :admin) }
     let(:nico_tag) { create(:tag, :nico) }
 
     it '401 when not logged in' do
@@ -91,89 +34,5 @@ RSpec.describe 'NicoTags', type: :request do
       patch "/tags/nico/#{non_nico.id}", params: { tags: 'a b' }
       expect(response).to have_http_status(:bad_request)
     end
-
-    it '200 and updates linked tags while recording tag versions' do
-      sign_in_as(admin)
-
-      nico_tag_name = TagName.create!(name: 'nico:nico_tags_spec_source')
-      nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-      linked_a_name = TagName.create!(name: 'nico_linked_a')
-      linked_a = Tag.create!(tag_name: linked_a_name, category: :general)
-
-      linked_b_name = TagName.create!(name: 'nico_linked_b')
-      linked_b = Tag.create!(tag_name: linked_b_name, category: :general)
-
-      TagVersioning.ensure_snapshot!(nico_tag, created_by_user: admin)
-
-      expect {
-        patch "/tags/nico/#{nico_tag.id}", params: {
-          tags: "  #{linked_a.name}\n#{linked_b.name}  "
-        }
-      }.to change(TagVersion, :count).by(2)
-       .and change(NicoTagVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      names = json.map { |t| t['name'] }
-      expect(names).to match_array(['nico_linked_a', 'nico_linked_b'])
-
-      linked_versions = TagVersion.where(tag: [linked_a, linked_b]).order(:tag_id)
-      expect(linked_versions.map(&:event_type)).to eq(['create', 'create'])
-      expect(linked_versions.map(&:created_by_user_id)).to all(eq(admin.id))
-
-      versions = nico_tag.reload.nico_tag_versions.order(:version_no)
-      expect(versions.map(&:event_type)).to eq(['create', 'update'])
-      expect(versions.last.linked_tags.split).to match_array([
-        'nico_linked_a',
-        'nico_linked_b'
-      ])
-      expect(versions.last.created_by_user_id).to eq(admin.id)
-    end
-
-    it 'returns 422 when linked tag normalises to nico tag' do
-      sign_in_as(member)
-
-      other_nico = create(:tag, :nico, name: 'nico:linked_ng')
-      TagName.create!(name: 'linked_ng_alias', canonical: other_nico.tag_name)
-
-      TagVersioning.ensure_snapshot!(nico_tag, created_by_user: member)
-
-      expect {
-        patch "/tags/nico/#{nico_tag.id}", params: { tags: 'linked_ng_alias' }
-      }.not_to change(NicoTagVersion, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          'tags' => ['ニコニコ・タグ同士は連携できません．'])
-    end
-
-    it 'returns the tags field error when a nico tag is specified directly' do
-      sign_in_as(member)
-
-      patch "/tags/nico/#{nico_tag.id}", params: { tags: 'nico:linked_ng' }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          'tags' => ['ニコニコ・タグ同士は連携できません．'])
-    end
-
-    it 'returns tag name validation errors on the tags field and rolls back created tags' do
-      sign_in_as(member)
-      TagNameSanitisationRule.create!(
-        priority: 1,
-        source_pattern: 'invalid',
-        replacement: 'valid'
-      )
-      nico_tag
-
-      expect {
-        patch "/tags/nico/#{nico_tag.id}", params: { tags: 'created_first invalid' }
-      }.not_to change(TagName, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors').fetch('tags')).to include(
-          a_string_including('タグ名 “invalid”:', '名前に使用できない文字が含まれてゐます．'))
-    end
   end
 end

backend/spec/requests/tag_children_spec.rb

@@ -58,47 +58,15 @@ RSpec.describe "TagChildren", type: :request do
       end
     end
 
-    context "when Tag.find raises (invalid ids)" do
+    context "when Tag.find raises (invalid ids) it still returns 204" do
       before { stub_current_user(admin) }
 
       let(:parent_id) { -1 }
       let(:child_id) { -1 }
 
-      it "returns 404" do
+      it "returns 204 (rescue nil)" do
         do_request
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    context 'when parent is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:parent) { create(:tag, :nico, name: 'nico:parent_ng') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400 and does not create relation' do
-        expect {
-          do_request
-        }.not_to change(TagImplication, :count)
-
-        expect(response).to have_http_status(:bad_request)
-      end
-    end
-
-    context 'when child is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:child) { create(:tag, :nico, name: 'nico:child_ng') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400 and does not create relation' do
-        expect {
-          do_request
-        }.not_to change(TagImplication, :count)
-
-        expect(response).to have_http_status(:bad_request)
+        expect(response).to have_http_status(:no_content)
       end
     end
   end
@@ -148,57 +116,17 @@ RSpec.describe "TagChildren", type: :request do
 
         expect(response).to have_http_status(:no_content)
       end
-
-      it 'records create and update versions for child tag' do
-        expect {
-          do_request
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:no_content)
-
-        versions = child.reload.tag_versions.order(:version_no)
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-        expect(versions.first.parent_tag_ids.split).to include(parent.id.to_s)
-        expect(versions.second.parent_tag_ids).to eq('')
-        expect(versions.second.created_by_user_id).to eq(admin.id)
-      end
     end
 
-    context "when Tag.find raises (invalid ids)" do
+    context "when Tag.find raises (invalid ids) it still returns 204" do
       before { stub_current_user(admin) }
 
       let(:parent_id) { -1 }
       let(:child_id) { -1 }
 
-      it "returns 404" do
+      it "returns 204 (rescue nil)" do
         do_request
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    context 'when parent is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:parent) { create(:tag, :nico, name: 'nico:parent_ng_delete') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400' do
-        do_request
-        expect(response).to have_http_status(:bad_request)
-      end
-    end
-
-    context 'when child is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:child) { create(:tag, :nico, name: 'nico:child_ng_delete') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400' do
-        do_request
-        expect(response).to have_http_status(:bad_request)
+        expect(response).to have_http_status(:no_content)
       end
     end
   end

backend/spec/requests/tag_versions_spec.rb

@@ -1,248 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'TagVersions API', type: :request do
-  let(:member) { create(:user, :member, name: 'version member') }
-
-  let!(:tag) { create(:tag, name: 'tag_versions_target', category: :general) }
-  let!(:other_tag) { create(:tag, name: 'tag_versions_other', category: :general) }
-
-  let!(:parent_shared) { create(:tag, name: 'parent_shared', category: :general) }
-  let!(:parent_old) { create(:tag, name: 'parent_old', category: :general) }
-  let!(:parent_new) { create(:tag, name: 'parent_new', category: :general) }
-  let!(:other_parent) { create(:tag, name: 'other_parent', category: :general) }
-
-  let(:t_v1) { Time.zone.local(2020, 1, 1, 12, 0, 0) }
-  let(:t_v2) { Time.zone.local(2020, 1, 2, 12, 0, 0) }
-  let(:t_other) { Time.zone.local(2020, 1, 3, 12, 0, 0) }
-
-  def create_tag_version!(
-    tag:,
-    version_no:,
-    event_type:,
-    name:,
-    category:,
-    aliases: [],
-    parent_tags: [],
-    created_by_user:,
-    created_at:
-  )
-    version =
-        TagVersion.create!(
-            tag: tag,
-            version_no: version_no,
-            event_type: event_type,
-            name: name,
-            category: category,
-            aliases: Array(aliases).join(' '),
-            parent_tag_ids: Array(parent_tags).map(&:id).join(' '),
-            created_by_user: created_by_user,
-            created_at: created_at)
-
-    tag.update_columns(version_no: version_no) if tag.has_attribute?(:version_no)
-    tag.version_no = version_no if tag.respond_to?(:version_no=)
-
-    version
-  end
-
-  let!(:v1) do
-    create_tag_version!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: 'old_tag_name',
-      category: 'general',
-      aliases: ['alias_shared', 'alias_old'],
-      parent_tags: [parent_shared, parent_old],
-      created_by_user: member,
-      created_at: t_v1
-    )
-  end
-
-  let!(:v2) do
-    create_tag_version!(
-      tag: tag,
-      version_no: 2,
-      event_type: 'update',
-      name: 'new_tag_name',
-      category: 'meme',
-      aliases: ['alias_shared', 'alias_new'],
-      parent_tags: [parent_shared, parent_new],
-      created_by_user: member,
-      created_at: t_v2
-    )
-  end
-
-  let!(:other_v1) do
-    create_tag_version!(
-      tag: other_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: 'other_tag_name',
-      category: 'general',
-      aliases: ['other_alias'],
-      parent_tags: [other_parent],
-      created_by_user: member,
-      created_at: t_other
-    )
-  end
-
-  describe 'GET /tags/versions' do
-    it 'returns all versions in reverse chronological order when id is omitted' do
-      get '/tags/versions'
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('versions', 'count')
-      expect(json.fetch('count')).to eq(3)
-
-      versions = json.fetch('versions')
-
-      expect(versions.map { |v| [v['tag_id'], v['version_no']] }).to eq([
-        [other_tag.id, 1],
-        [tag.id, 2],
-        [tag.id, 1]
-      ])
-    end
-
-    it 'returns versions for the specified tag with diffs' do
-      get '/tags/versions', params: { id: tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('versions', 'count')
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.map { |v| v['tag_id'] }.uniq).to eq([tag.id])
-      expect(versions.map { |v| v['version_no'] }).to eq([2, 1])
-
-      latest = versions.first
-      expect(latest).to include(
-        'tag_id' => tag.id,
-        'version_no' => 2,
-        'event_type' => 'update',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-
-      expect(latest.fetch('name')).to eq(
-        'current' => 'new_tag_name',
-        'prev' => 'old_tag_name'
-      )
-      expect(latest.fetch('category')).to eq(
-        'current' => 'meme',
-        'prev' => 'general'
-      )
-      expect(latest.fetch('aliases')).to include(
-        { 'name' => 'alias_shared', 'type' => 'context' },
-        { 'name' => 'alias_new', 'type' => 'added' },
-        { 'name' => 'alias_old', 'type' => 'removed' }
-      )
-      expect(latest.fetch('parent_tags')).to include(
-        a_hash_including(
-          'type' => 'context',
-          'tag' => a_hash_including(
-            'id' => parent_shared.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_new.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'removed',
-          'tag' => a_hash_including(
-            'id' => parent_old.id
-          )
-        )
-      )
-      expect(latest.fetch('created_at')).to eq(t_v2.iso8601)
-
-      first = versions.second
-      expect(first).to include(
-        'tag_id' => tag.id,
-        'version_no' => 1,
-        'event_type' => 'create',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-      expect(first.fetch('name')).to eq(
-        'current' => 'old_tag_name',
-        'prev' => nil
-      )
-      expect(first.fetch('category')).to eq(
-        'current' => 'general',
-        'prev' => nil
-      )
-      expect(first.fetch('aliases')).to include(
-        { 'name' => 'alias_shared', 'type' => 'added' },
-        { 'name' => 'alias_old', 'type' => 'added' }
-      )
-      expect(first.fetch('parent_tags')).to include(
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_shared.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_old.id
-          )
-        )
-      )
-      expect(first.fetch('created_at')).to eq(t_v1.iso8601)
-    end
-
-    it 'returns empty when the specified tag has no versions' do
-      fresh_tag = create(:tag, name: 'no_versions_tag', category: :general)
-
-      get '/tags/versions', params: { id: fresh_tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-
-    it 'clamps page and limit to at least 1' do
-      get '/tags/versions', params: { id: tag.id, page: 0, limit: 0 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.size).to eq(1)
-      expect(versions.first['version_no']).to eq(2)
-    end
-
-    it 'does not create tag versions by wiki updates when tag has no versions yet' do
-      wiki_tag_name = TagName.create!(name: 'tag_versions_from_wiki')
-      wiki_tag = Tag.create!(tag_name: wiki_tag_name, category: :general)
-
-      wiki_page =
-          Wiki::Commit.create_content!(
-              tag_name: wiki_tag_name,
-              body: 'before',
-              created_by_user: member,
-              message: 'init')
-
-      Wiki::Commit.content!(
-          page: wiki_page,
-          body: 'after',
-          created_user: member,
-          message: 'edit',
-          base_revision_id: wiki_page.current_revision.id)
-
-      get '/tags/versions', params: { id: wiki_tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-  end
-end

backend/spec/requests/tag_wiki_history_integrity_spec.rb

@@ -1,160 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag and wiki history integrity', type: :request do
-  let(:member_user) { create(:user, role: 'member') }
-
-  def stub_current_user user
-    allow_any_instance_of(ApplicationController).to receive(:current_user).and_return(user)
-  end
-
-  def create_tag! name:, category: :general
-    tag_name = TagName.create!(name:)
-    Tag.create!(tag_name:, category:)
-  end
-
-  def create_wiki_for_tag! tag:, body: 'wiki body', user: member_user
-    Wiki::Commit.create_content!(
-        tag_name: tag.tag_name,
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  before do
-    stub_current_user(member_user)
-  end
-
-  describe 'PATCH /tags/:id' do
-    it 'records wiki_version when tag name changes and tag has wiki' do
-      tag = create_tag!(name: 'patch_tag_wiki_before')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      expect {
-        patch "/tags/#{ tag.id }", params: {
-          name: 'patch_tag_wiki_after',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-      version = wiki_page.wiki_versions.order(:version_no).last
-
-      expect(tag.name).to eq('patch_tag_wiki_after')
-      expect(wiki_page.title).to eq('patch_tag_wiki_after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'patch_tag_wiki_after',
-        body: 'wiki body before',
-        created_by_user_id: member_user.id
-      )
-    end
-
-    it 'does not record wiki_version when only category changes' do
-      tag = create_tag!(name: 'patch_tag_category_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        patch "/tags/#{ tag.id }", params: {
-          category: 'meme',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-
-      expect(tag.name).to eq('patch_tag_category_only')
-      expect(tag.category).to eq('meme')
-      expect(wiki_page.wiki_versions.count).to eq(before_wiki_versions)
-    end
-  end
-
-  describe 'PUT /tags/:id' do
-    it 'records wiki_version when tag name changes and tag has wiki' do
-      tag = create_tag!(name: 'put_tag_wiki_before')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_wiki_after',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-      version = wiki_page.wiki_versions.order(:version_no).last
-
-      expect(tag.name).to eq('put_tag_wiki_after')
-      expect(wiki_page.title).to eq('put_tag_wiki_after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'put_tag_wiki_after',
-        body: 'wiki body before',
-        created_by_user_id: member_user.id
-      )
-    end
-
-    it 'does not record wiki_version when only category changes' do
-      tag = create_tag!(name: 'put_tag_category_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_category_only',
-          category: 'meme',
-          aliases: '',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-
-      expect(tag.name).to eq('put_tag_category_only')
-      expect(tag.category).to eq('meme')
-      expect(wiki_page.wiki_versions.count).to eq(before_wiki_versions)
-    end
-
-    it 'does not record wiki_version when only aliases change' do
-      tag = create_tag!(name: 'put_tag_alias_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_alias_only',
-          category: 'general',
-          aliases: 'put_tag_alias_only_alias',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-      expect(wiki_page.reload.wiki_versions.count).to eq(before_wiki_versions)
-    end
-  end
-end

backend/spec/requests/tags_deerjikists_spec.rb

@@ -8,35 +8,23 @@ RSpec.describe 'Tags deerjikists API', type: :request do
 
   let!(:tag) { create(:tag, category: :deerjikist) }
 
-  let(:member) { create(:user, :member) }
-  let(:guest) { create(:user, role: :guest) }
-
   before do
+    # show_by_name / deerjikists_by_name 用に名前を固定
     tag.tag_name.update!(name: 'deerjika')
   end
 
   describe 'GET /tags/:id/deerjikists' do
     subject(:do_request) do
-      get "/tags/#{tag_id}/deerjikists"
+      get "/tags/#{ tag_id }/deerjikists"
     end
 
     let(:tag_id) { tag.id }
 
     context 'when tag exists and has no deerjikists' do
-      it 'returns 200 with tag and empty deerjikists array' do
+      it 'returns 200 and empty array' do
         do_request
-
         expect(response).to have_http_status(:ok)
-
-        expect(json).to be_a(Hash)
-
-        expect(json['tag']).to be_a(Hash)
-        expect(json['tag']['id']).to eq(tag.id)
-        expect(json['tag']['name']).to eq('deerjika')
-        expect(json['tag']['category']).to eq('deerjikist')
-        expect(json['tag']['has_deerjikists']).to eq(false)
-
-        expect(json['deerjikists']).to eq([])
+        expect(json).to eq([])
       end
     end
 
@@ -46,27 +34,17 @@ RSpec.describe 'Tags deerjikists API', type: :request do
         Deerjikist.create!(platform: platform2, code: code2, tag: tag)
       end
 
-      it 'returns 200 with tag and deerjikists array' do
+      it 'returns 200 and deerjikists array' do
         do_request
-
         expect(response).to have_http_status(:ok)
 
-        expect(json).to be_a(Hash)
+        expect(json).to be_a(Array)
+        expect(json.size).to eq(2)
 
-        expect(json['tag']).to be_a(Hash)
-        expect(json['tag']['id']).to eq(tag.id)
-        expect(json['tag']['name']).to eq('deerjika')
-        expect(json['tag']['category']).to eq('deerjikist')
-        expect(json['tag']['has_deerjikists']).to eq(true)
-
-        expect(json['deerjikists']).to be_a(Array)
-        expect(json['deerjikists'].size).to eq(2)
-
-        expect(json['deerjikists'].map { |h| [h['platform'], h['code']] })
-          .to contain_exactly(
-            [platform1, code1],
-            [platform2, code2],
-          )
+        expect(json.map { |h| [h['platform'], h['code']] }).to contain_exactly(
+          [platform1, code1],
+          [platform2, code2],
+        )
       end
     end
 
@@ -75,7 +53,6 @@ RSpec.describe 'Tags deerjikists API', type: :request do
 
       it 'returns 404' do
         do_request
-
         expect(response).to have_http_status(:not_found)
       end
     end
@@ -83,7 +60,7 @@ RSpec.describe 'Tags deerjikists API', type: :request do
 
   describe 'GET /tags/name/:name/deerjikists' do
     subject(:do_request) do
-      get "/tags/name/#{name}/deerjikists"
+      get "/tags/name/#{ name }/deerjikists"
     end
 
     let(:name) { 'deerjika' }
@@ -93,7 +70,6 @@ RSpec.describe 'Tags deerjikists API', type: :request do
 
       it 'returns 400' do
         do_request
-
         expect(response).to have_http_status(:bad_request)
       end
     end
@@ -103,233 +79,23 @@ RSpec.describe 'Tags deerjikists API', type: :request do
 
       it 'returns 404' do
         do_request
-
         expect(response).to have_http_status(:not_found)
       end
     end
 
-    context 'when tag exists and has no deerjikists' do
-      it 'returns 200 with tag and empty deerjikists array' do
-        do_request
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json).to be_a(Hash)
-
-        expect(json['tag']).to be_a(Hash)
-        expect(json['tag']['id']).to eq(tag.id)
-        expect(json['tag']['name']).to eq('deerjika')
-        expect(json['tag']['category']).to eq('deerjikist')
-        expect(json['tag']['has_deerjikists']).to eq(false)
-
-        expect(json['deerjikists']).to eq([])
-      end
-    end
-
     context 'when tag exists and has deerjikists' do
       before do
         Deerjikist.create!(platform: platform1, code: code1, tag: tag)
       end
 
-      it 'returns 200 with tag and deerjikists array' do
+      it 'returns 200 and deerjikists array' do
         do_request
-
         expect(response).to have_http_status(:ok)
 
-        expect(json).to be_a(Hash)
-
-        expect(json['tag']).to be_a(Hash)
-        expect(json['tag']['id']).to eq(tag.id)
-        expect(json['tag']['name']).to eq('deerjika')
-        expect(json['tag']['category']).to eq('deerjikist')
-        expect(json['tag']['has_deerjikists']).to eq(true)
-
-        expect(json['deerjikists']).to be_a(Array)
-        expect(json['deerjikists'].size).to eq(1)
-
-        expect(json['deerjikists'][0]['platform']).to eq(platform1)
-        expect(json['deerjikists'][0]['code']).to eq(code1)
-      end
-    end
-  end
-
-  describe 'PUT /tags/:id/deerjikists' do
-    subject(:do_request) do
-      put "/tags/#{tag_id}/deerjikists", params: payload, as: :json
-    end
-
-    let(:tag_id) { tag.id }
-    let(:payload) do
-      [
-        { platform: platform1, code: code1 },
-        { platform: platform2, code: code2 },
-      ]
-    end
-
-    context 'when not logged in' do
-      it 'returns 401' do
-        do_request
-
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when logged in but not member' do
-      before do
-        sign_in_as guest
-      end
-
-      it 'returns 403' do
-        do_request
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when tag does not exist' do
-      let(:tag_id) { 9_999_999 }
-
-      before do
-        sign_in_as member
-      end
-
-      it 'returns 404' do
-        do_request
-
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    context 'when logged in as member' do
-      before do
-        sign_in_as member
-      end
-
-      context 'when tag has no deerjikists' do
-        it 'creates deerjikists and returns deerjikists array' do
-          expect {
-            do_request
-          }.to change { Deerjikist.where(tag: tag).count }.from(0).to(2)
-
-          expect(response).to have_http_status(:ok)
-
-          expect(json).to be_a(Array)
-          expect(json.map { |h| [h['platform'], h['code']] })
-            .to contain_exactly(
-              [platform1, code1],
-              [platform2, code2],
-            )
-
-          expect(Deerjikist.where(tag: tag).map { |d| [d.platform, d.code] })
-            .to contain_exactly(
-              [platform1, code1],
-              [platform2, code2],
-            )
-        end
-      end
-
-      context 'when tag already has deerjikists' do
-        before do
-          Deerjikist.create!(platform: platform1, code: 'old-code-1', tag: tag)
-          Deerjikist.create!(platform: platform2, code: 'old-code-2', tag: tag)
-        end
-
-        it 'replaces deerjikists and returns deerjikists array' do
-          do_request
-
-          expect(response).to have_http_status(:ok)
-
-          expect(Deerjikist.where(tag: tag).map { |d| [d.platform, d.code] })
-            .to contain_exactly(
-              [platform1, code1],
-              [platform2, code2],
-            )
-
-          expect(Deerjikist.exists?(platform: platform1, code: 'old-code-1')).to eq(false)
-          expect(Deerjikist.exists?(platform: platform2, code: 'old-code-2')).to eq(false)
-
-          expect(json).to be_a(Array)
-          expect(json.map { |h| [h['platform'], h['code']] })
-            .to contain_exactly(
-              [platform1, code1],
-              [platform2, code2],
-            )
-        end
-      end
-
-      context 'when payload is empty array' do
-        let(:payload) { [] }
-
-        before do
-          Deerjikist.create!(platform: platform1, code: code1, tag: tag)
-          Deerjikist.create!(platform: platform2, code: code2, tag: tag)
-        end
-
-        it 'clears deerjikists and returns empty array' do
-          expect {
-            do_request
-          }.to change { Deerjikist.where(tag: tag).count }.from(2).to(0)
-
-          expect(response).to have_http_status(:ok)
-          expect(json).to eq([])
-        end
-      end
-
-      context 'when a row is invalid' do
-        let(:payload) do
-          [
-            { platform: '', code: code1 },
-          ]
-        end
-
-        it 'returns 422 with indexed field errors and does not replace existing deerjikists' do
-          Deerjikist.create!(platform: platform1, code: code1, tag: tag)
-
-          expect {
-            do_request
-          }.not_to change { Deerjikist.where(tag: tag).map { |d| [d.platform, d.code] } }
-
-          expect(response).to have_http_status(:unprocessable_entity)
-          expect(json).to include(
-              'type' => 'validation_error',
-              'message' => '入力内容を確認してください．',
-              'base_errors' => [])
-          expect(json.fetch('errors')).to include(
-              'deerjikists.0.platform' => [be_present])
-        end
-      end
-
-      context 'when youtube code is handle' do
-        let(:channel_id) { 'UCabcdefghijklmnopqrstuv' }
-        let(:payload) do
-          [
-            { platform: 'youtube', code: '@deerjika' },
-          ]
-        end
-
-        before do
-          allow(Net::HTTP).to receive(:get).and_return(
-            %(<link rel="canonical" href="https://www.youtube.com/channel/#{channel_id}">),
-          )
-        end
-
-        it 'normalises youtube handle to channel id' do
-          expect {
-            do_request
-          }.to change { Deerjikist.where(tag: tag).count }.from(0).to(1)
-
-          expect(response).to have_http_status(:ok)
-
-          expect(Net::HTTP).to have_received(:get)
-
-          expect(Deerjikist.exists?(platform: 'youtube', code: channel_id, tag: tag))
-            .to eq(true)
-
-          expect(json).to be_a(Array)
-          expect(json.size).to eq(1)
-          expect(json[0]['platform']).to eq('youtube')
-          expect(json[0]['code']).to eq(channel_id)
-        end
+        expect(json).to be_a(Array)
+        expect(json.size).to eq(1)
+        expect(json[0]['platform']).to eq(platform1)
+        expect(json[0]['code']).to eq(code1)
       end
     end
   end

backend/spec/requests/tags_spec.rb

@@ -1,6 +1,7 @@
 require 'cgi'
 require 'rails_helper'
 
+
 RSpec.describe 'Tags API', type: :request do
   let!(:tn) { TagName.create!(name: 'spec_tag') }
   let!(:tag) { Tag.create!(tag_name: tn, category: :general) }
@@ -196,30 +197,6 @@ RSpec.describe 'Tags API', type: :request do
       expect(response_tags.size).to eq(1)
       expect(response_names).to eq(['norm_a'])
     end
-
-    it 'returns aliases and parent tags' do
-      parent_tag = Tag.create!(
-        tag_name: TagName.create!(name: 'index_parent_tag'),
-        category: :meme
-      )
-      TagImplication.create!(tag:, parent_tag:)
-
-      get '/tags', params: { name: 'spec_tag' }
-
-      expect(response).to have_http_status(:ok)
-
-      row = response_tags.find { |t| t['name'] == 'spec_tag' }
-
-      expect(row['aliases']).to include('unko')
-      expect(row['parents'].map { |t| t['name'] }).to include('index_parent_tag')
-
-      parent = row['parents'].find { |t| t['name'] == 'index_parent_tag' }
-      expect(parent).to include(
-        'id' => parent_tag.id,
-        'name' => 'index_parent_tag',
-        'category' => 'meme'
-      )
-    end
   end
 
   describe 'GET /tags/:id' do
@@ -243,28 +220,6 @@ RSpec.describe 'Tags API', type: :request do
         expect(json).to have_key('created_at')
         expect(json).to have_key('updated_at')
       end
-
-      it 'returns aliases and parent tags' do
-        parent_tag = Tag.create!(
-          tag_name: TagName.create!(name: 'show_parent_tag'),
-          category: :character
-        )
-        TagImplication.create!(tag:, parent_tag:)
-
-        request
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json['aliases']).to include('unko')
-        expect(json['parents'].map { |t| t['name'] }).to include('show_parent_tag')
-
-        parent = json['parents'].find { |t| t['name'] == 'show_parent_tag' }
-        expect(parent).to include(
-          'id' => parent_tag.id,
-          'name' => 'show_parent_tag',
-          'category' => 'character'
-        )
-      end
     end
 
     context 'when tag does not exist' do
@@ -404,120 +359,14 @@ RSpec.describe 'Tags API', type: :request do
         expect(tag.category).to eq('meta')
       end
 
-      it '存在しない id なら 404 を返す' do
+      it '存在しない id だと RecordNotFound になる（通常は 404）' do
         patch '/tags/999999999', params: { name: 'x' }
-        expect(response).to have_http_status(:not_found)
+        expect(response.status).to be_in([404, 500])
       end
 
-      it 'nico category への変更は 422 を返す' do
-        patch "/tags/#{tag.id}", params: { name: 'new', category: 'nico' }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.category).to eq('general')
-      end
-
-      it 'creates initial and update tag versions when name and category change' do
-        expect {
-          patch "/tags/#{tag.id}", params: { name: 'new_tag_name', category: 'meme' }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        versions = tag.reload.tag_versions.order(:version_no)
-
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-
-        expect(versions.first.name).to eq('spec_tag')
-        expect(versions.first.category).to eq('general')
-        expect(versions.first.aliases.split).to include('unko')
-
-        expect(versions.second.name).to eq('new_tag_name')
-        expect(versions.second.category).to eq('meme')
-        expect(versions.second.created_by_user_id).to eq(member_user.id)
-      end
-
-      it 'returns 422 when changing normal tag category to nico' do
-        expect {
-          patch "/tags/#{tag.id}", params: { category: 'nico' }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.category).to eq('general')
-      end
-
-      it 'returns 422 when updating nico tag name' do
-        nico_tag_name = TagName.create!(name: 'nico:tags_spec_source')
-        nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-        expect {
-          patch "/tags/#{ nico_tag.id }", params: { name: 'nico:tags_spec_renamed' }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(nico_tag.reload.name).to eq('nico:tags_spec_source')
-        expect(nico_tag.category).to eq('nico')
-      end
-
-      it 'returns 422 when changing nico tag category to normal category' do
-        nico_tag_name = TagName.create!(name: 'nico:category_change_ng')
-        nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-        expect {
-          patch "/tags/#{nico_tag.id}", params: { category: 'general' }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(nico_tag.reload.category).to eq('nico')
-      end
-
-      it 'PATCH で tag の name を変更すると対応する wiki version を作成する' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'wiki body before',
-                created_by_user: member_user,
-                message: 'init')
-
-        expect {
-          patch "/tags/#{ tag.id }", params: {
-            name: 'patch_wiki_renamed_tag',
-          }
-        }
-            .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        version = wiki_page.reload.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          event_type: 'update',
-          title: 'patch_wiki_renamed_tag',
-          body: 'wiki body before',
-          created_by_user_id: member_user.id
-        )
-      end
-
-      it 'tag の category だけを変更しても wiki version は作成しない' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'wiki body before',
-                created_by_user: member_user,
-                message: 'init')
-
-        before_wiki_version_count = wiki_page.reload.wiki_versions.count
-
-        expect {
-          patch "/tags/#{ tag.id }", params: {
-            category: 'meme',
-          }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-        expect(wiki_page.reload.wiki_versions.count).to eq(before_wiki_version_count)
+      it 'バリデーションで update! が失敗したら（通常は 422 か 500）' do
+        patch "/tags/#{ tag.id }", params: { name: 'new', category: 'nico' }
+        expect(response.status).to be_in([422, 500])
       end
     end
   end
@@ -661,397 +510,4 @@ RSpec.describe 'Tags API', type: :request do
       expect(response).to have_http_status(:not_found)
     end
   end
-
-  describe 'PUT /tags/:id' do
-    context '未ログイン' do
-      before { stub_current_user(nil) }
-
-      it '401 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'ログインしてゐるが member でない' do
-      before { stub_current_user(non_member_user) }
-
-      it '403 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'member' do
-      before { stub_current_user(member_user) }
-
-      it '存在しない id なら 404 を返す' do
-        put '/tags/999999999', params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:not_found)
-      end
-
-      it 'name が空なら 422 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: '',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.name).to eq('spec_tag')
-      end
-
-      it 'category が空なら 422 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: '',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.category).to eq('general')
-      end
-
-      it 'name, category, aliases, parent tags をまとめて更新できる' do
-        old_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_old_parent'),
-          category: :general
-        )
-        kept_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_kept_parent'),
-          category: :general
-        )
-        TagImplication.create!(tag:, parent_tag: old_parent)
-        TagImplication.create!(tag:, parent_tag: kept_parent)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_renamed_tag',
-          category: 'meme',
-          aliases: 'put_alias_a put_alias_b put_alias_a',
-          parent_tags: 'put_kept_parent put_new_parent',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(tag.name).to eq('put_renamed_tag')
-        expect(tag.category).to eq('meme')
-
-        expect(TagName.find_by(name: 'put_alias_a').canonical).to eq(tag.tag_name)
-        expect(TagName.find_by(name: 'put_alias_b').canonical).to eq(tag.tag_name)
-
-        old_name_alias = TagName.find_by(name: 'spec_tag')
-        expect(old_name_alias).to be_present
-        expect(old_name_alias.canonical).to eq(tag.tag_name)
-
-        expect(alias_tn.reload.canonical).to be_nil
-
-        expect(tag.parents.map(&:name)).to contain_exactly(
-          'put_kept_parent',
-          'put_new_parent'
-        )
-
-        expect(TagImplication.where(tag:, parent_tag: old_parent)).not_to exist
-
-        expect(json['name']).to eq('put_renamed_tag')
-        expect(json['category']).to eq('meme')
-        expect(json['aliases']).to contain_exactly(
-          'put_alias_a',
-          'put_alias_b',
-          'spec_tag'
-        )
-        expect(json['parents'].map { |t| t['name'] }).to contain_exactly(
-          'put_kept_parent',
-          'put_new_parent'
-        )
-      end
-
-      it 'aliases に現在名を指定しても alias には残さない' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'spec_tag put_alias_self_test',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(TagName.find_by(name: 'put_alias_self_test').canonical).to eq(tag.tag_name)
-        expect(json['aliases']).to include('put_alias_self_test')
-        expect(json['aliases']).not_to include('spec_tag')
-      end
-
-      it 'parent_tags に自分自身を指定しても自己参照は作らない' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: 'spec_tag',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(TagImplication.where(tag:, parent_tag: tag)).not_to exist
-        expect(tag.reload.parents).to eq([])
-      end
-
-      it 'initial and update tag versions を作成する' do
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'put_versioned_tag',
-            category: 'meta',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        versions = tag.reload.tag_versions.order(:version_no)
-
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-
-        expect(versions.first.name).to eq('spec_tag')
-        expect(versions.first.category).to eq('general')
-        expect(versions.first.aliases.split).to include('unko')
-
-        expect(versions.second.name).to eq('put_versioned_tag')
-        expect(versions.second.category).to eq('meta')
-        expect(versions.second.aliases.split).to include('spec_tag')
-        expect(versions.second.created_by_user_id).to eq(member_user.id)
-      end
-
-      it 'parent tag の snapshot も作成する' do
-        old_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_snapshot_old_parent'),
-          category: :general
-        )
-        new_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_snapshot_new_parent'),
-          category: :general
-        )
-        TagImplication.create!(tag:, parent_tag: old_parent)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: new_parent.name,
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(old_parent.reload.tag_versions.map(&:event_type)).to include('create')
-        expect(new_parent.reload.tag_versions.map(&:event_type)).to include('create')
-      end
-
-      it 'normal tag を nico category には変更できない' do
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'spec_tag',
-            category: 'nico',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.category).to eq('general')
-      end
-
-      it 'nico tag は更新できない' do
-        nico_tag = Tag.create!(
-          tag_name: TagName.create!(name: 'nico:put_update_all_ng'),
-          category: :nico
-        )
-
-        expect {
-          put "/tags/#{ nico_tag.id }", params: {
-            name: 'nico:put_update_all_renamed',
-            category: 'nico',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(nico_tag.reload.name).to eq('nico:put_update_all_ng')
-        expect(nico_tag.category).to eq('nico')
-      end
-
-      it 'system tag の name は変更できない' do
-        system_tag = Tag.tagme
-        old_name = system_tag.name
-        old_category = system_tag.category
-
-        expect {
-          put "/tags/#{ system_tag.id }", params: {
-            name: 'put_system_tag_renamed',
-            category: old_category,
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(system_tag.reload.name).to eq(old_name)
-        expect(system_tag.category).to eq(old_category)
-      end
-
-      it 'wiki を持つ tag を更新すると wiki version も作成する' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'wiki body before',
-                created_by_user: member_user,
-                message: 'init')
-
-        Wiki::Commit.content!(
-          page: wiki_page,
-          body: 'wiki body before',
-          created_user: member_user,
-          message: 'init'
-        )
-
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'put_wiki_version_tag',
-            category: 'meme',
-            aliases: 'unko',
-            parent_tags: '',
-          }
-        }
-            .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        version = wiki_page.reload.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          event_type: 'update',
-          title: 'put_wiki_version_tag',
-          body: 'wiki body before',
-          created_by_user_id: member_user.id
-        )
-      end
-
-      it '別名を他 tag から奪った場合、奪はれた側の tag version も作成する' do
-        old_owner = Tag.create!(
-          tag_name: TagName.create!(name: 'put_alias_old_owner'),
-          category: :general
-        )
-        stolen_alias = TagName.create!(
-          name: 'put_stolen_alias',
-          canonical: old_owner.tag_name
-        )
-
-        expect(old_owner.tag_name.aliases.map(&:name)).to include('put_stolen_alias')
-
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'spec_tag',
-            category: 'general',
-            aliases: 'unko put_stolen_alias',
-            parent_tags: '',
-          }
-        }
-            .to change { tag.reload.tag_versions.count }.by(2)
-            .and change { old_owner.reload.tag_versions.count }.by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        expect(stolen_alias.reload.canonical).to eq(tag.tag_name)
-        expect(old_owner.reload.tag_name.aliases.map(&:name)).not_to include('put_stolen_alias')
-
-        old_owner_versions = old_owner.tag_versions.order(:version_no)
-
-        expect(old_owner_versions.first.event_type).to eq('create')
-        expect(old_owner_versions.first.aliases.split).to include('put_stolen_alias')
-
-        expect(old_owner_versions.second.event_type).to eq('update')
-        expect(old_owner_versions.second.aliases.split).not_to include('put_stolen_alias')
-      end
-
-      it 'parent_tags に指定すると循環する tag は 422 にする' do
-        pending '#332 で対応予定'
-
-        child = Tag.create!(
-          tag_name: TagName.create!(name: 'put_cycle_child'),
-          category: :general
-        )
-
-        TagImplication.create!(tag: child, parent_tag: tag)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: child.name,
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(TagImplication.where(tag:, parent_tag: child)).not_to exist
-      end
-
-      it 'tag の name を変更すると対応する wiki version を作成する' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'wiki body before',
-                created_by_user: member_user,
-                message: 'init')
-
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'put_wiki_renamed_tag',
-            category: 'general',
-            aliases: 'unko',
-            parent_tags: '',
-          }
-        }
-            .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        version = wiki_page.reload.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          event_type: 'update',
-          title: 'put_wiki_renamed_tag',
-          body: 'wiki body before',
-          created_by_user_id: member_user.id
-        )
-      end
-    end
-  end
 end

backend/spec/requests/theatre_comments_spec.rb

@@ -80,26 +80,6 @@ RSpec.describe 'TheatreComments', type: :request do
       expect(response).to have_http_status(:ok)
       expect(response.parsed_body.map { |row| row['no'] }).to eq([3, 2, 1])
     end
-
-    it '削除済みコメントは deleted として返し、本文を隠す' do
-      comment_2.discard!
-
-      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-
-      deleted_comment = response.parsed_body.find { _1['no'] == 2 }
-      expect(deleted_comment).to include(
-        'deleted' => true,
-        'content' => nil
-      )
-
-      visible_comment = response.parsed_body.find { _1['no'] == 3 }
-      expect(visible_comment).to include(
-        'deleted' => false,
-        'content' => 'third comment'
-      )
-    end
   end
 
   describe 'POST /theatres/:theatre_id/comments' do
@@ -167,44 +147,4 @@ RSpec.describe 'TheatreComments', type: :request do
       })
     end
   end
-
-  describe 'DELETE /theatres/:theatre_id/comments/:id' do
-    let(:theatre) { create(:theatre) }
-    let(:alice) { create(:user, name: 'Alice') }
-    let(:bob) { create(:user, name: 'Bob') }
-    let!(:comment) do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 1,
-        user: alice,
-        content: 'delete target'
-      )
-    end
-
-    it 'returns 401 when not logged in' do
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:unauthorized)
-      expect(comment.reload.discarded?).to eq(false)
-    end
-
-    it 'allows the comment owner to delete it' do
-      sign_in_as(alice)
-
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:no_content)
-      expect(comment.reload.discarded?).to eq(true)
-    end
-
-    it 'returns 403 when another user tries to delete it' do
-      sign_in_as(bob)
-
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:forbidden)
-      expect(comment.reload.discarded?).to eq(false)
-    end
-  end
 end

backend/spec/requests/theatre_programmes_spec.rb

@@ -1,38 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'TheatreProgrammes', type: :request do
-  describe 'GET /theatres/:theatre_id/programmes' do
-    let(:theatre) { create(:theatre) }
-    let(:other_theatre) { create(:theatre) }
-    let(:post_1) { Post.create!(title: 'first', url: 'https://www.nicovideo.jp/watch/sm1') }
-    let(:post_2) { Post.create!(title: 'second', url: 'https://www.nicovideo.jp/watch/sm2') }
-    let(:other_post) { Post.create!(title: 'other', url: 'https://www.nicovideo.jp/watch/sm3') }
-
-    before do
-      TheatreProgramme.create!(theatre:, position: 1, post: post_1, created_at: 2.minutes.ago)
-      TheatreProgramme.create!(theatre:, position: 2, post: post_2, created_at: 1.minute.ago)
-      TheatreProgramme.create!(
-        theatre: other_theatre,
-        position: 1,
-        post: other_post,
-        created_at: 1.minute.ago
-      )
-    end
-
-    it 'returns programmes for the theatre in descending position with post json' do
-      get "/theatres/#{theatre.id}/programmes"
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { _1['position'] }).to eq([2, 1])
-      expect(json.map { _1.dig('post', 'title') }).to eq(['second', 'first'])
-      expect(json.first['post']).to include('id' => post_2.id, 'url' => post_2.url)
-    end
-
-    it 'filters programmes by position_gt' do
-      get "/theatres/#{theatre.id}/programmes", params: { position_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { _1['position'] }).to eq([2])
-    end
-  end
-end

backend/spec/requests/theatres_spec.rb

@@ -14,24 +14,10 @@ RSpec.describe 'Theatres API', type: :request do
   let(:member) { create(:user, :member, name: 'member user') }
   let(:other_user) { create(:user, :member, name: 'other user') }
 
-  let!(:niconico_post) do
-    Post.create!(
-      title: 'niconico post',
-      url: 'https://www.nicovideo.jp/watch/sm123'
-    )
-  end
-
-  let!(:second_niconico_post) do
-    Post.create!(
-      title: 'second niconico post',
-      url: 'https://www.nicovideo.jp/watch/sm456'
-    )
-  end
-
   let!(:youtube_post) do
     Post.create!(
       title: 'youtube post',
-      url: 'https://www.youtube.com/watch?v=yt123'
+      url: 'https://www.youtube.com/watch?v=spec123'
     )
   end
 
@@ -134,8 +120,7 @@ RSpec.describe 'Theatres API', type: :request do
         expect(json).to include(
           'host_flg' => true,
           'post_id' => nil,
-          'post_started_at' => nil,
-          'post_elapsed_ms' => nil
+          'post_started_at' => nil
         )
 
         expect(json.fetch('watching_users')).to contain_exactly(
@@ -192,8 +177,7 @@ RSpec.describe 'Theatres API', type: :request do
         expect(json).to include(
           'host_flg' => false,
           'post_id' => nil,
-          'post_started_at' => nil,
-          'post_elapsed_ms' => nil
+          'post_started_at' => nil
         )
 
         expect(json.fetch('watching_users')).to contain_exactly(
@@ -220,7 +204,7 @@ RSpec.describe 'Theatres API', type: :request do
         )
         theatre.update!(
           host_user: other_user,
-          current_post: niconico_post,
+          current_post: youtube_post,
           current_post_started_at: started_at
         )
         sign_in_as(member)
@@ -236,11 +220,9 @@ RSpec.describe 'Theatres API', type: :request do
         expect(theatre.host_user_id).to eq(member.id)
 
         expect(json['host_flg']).to eq(true)
-        expect(json['post_id']).to eq(niconico_post.id)
+        expect(json['post_id']).to eq(youtube_post.id)
         expect(Time.zone.parse(json['post_started_at']))
           .to be_within(1.second).of(started_at)
-        expect(json['post_elapsed_ms'])
-          .to be_within(1_000).of(120_000)
       end
     end
   end
@@ -291,36 +273,16 @@ RSpec.describe 'Theatres API', type: :request do
       it 'sets current_post to an eligible post and updates current_post_started_at' do
         expect { do_request }
           .to change { theatre.reload.current_post_id }
+          .from(nil).to(youtube_post.id)
 
         expect(response).to have_http_status(:no_content)
-        expect([niconico_post.id, second_niconico_post.id, youtube_post.id])
-          .to include(theatre.reload.current_post_id)
         expect(theatre.reload.current_post_started_at)
           .to be_within(1.second).of(Time.current)
-        expect(theatre.programmes.count).to eq(1)
-      end
-    end
-
-    context 'when only a YouTube post is eligible' do
-      before do
-        niconico_post.destroy!
-        second_niconico_post.destroy!
-        theatre.update!(host_user: member)
-        sign_in_as(member)
-      end
-
-      it 'sets current_post to the YouTube post' do
-        do_request
-
-        expect(response).to have_http_status(:no_content)
-        expect(theatre.reload.current_post_id).to eq(youtube_post.id)
       end
     end
 
     context 'when current user is host and no eligible post exists' do
       before do
-        niconico_post.destroy!
-        second_niconico_post.destroy!
         youtube_post.destroy!
         theatre.update!(
           host_user: member,
@@ -337,189 +299,9 @@ RSpec.describe 'Theatres API', type: :request do
 
         theatre.reload
         expect(theatre.current_post_id).to be_nil
-        expect(theatre.current_post_started_at).to be_nil
+        expect(theatre.current_post_started_at)
+          .to be_within(1.second).of(Time.current)
       end
     end
   end
-
-  describe 'PUT /theatres/:id/skip_vote' do
-    subject(:do_request) do
-      put "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-    end
-
-    let(:third_user) { create(:user, :member, name: 'third user') }
-    let(:requested_post_id) { niconico_post.id }
-
-    before do
-      theatre.update!(current_post: niconico_post, current_post_started_at: 10.seconds.ago)
-      [member, other_user, third_user].each do |user|
-        TheatreWatchingUser.create!(
-          theatre:,
-          user:,
-          expires_at: 10.seconds.from_now
-        )
-      end
-    end
-
-    it 'returns 401 when not logged in' do
-      sign_out
-
-      expect { do_request }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns 422 when post_id is invalid' do
-      sign_in_as(member)
-
-      expect {
-        put "/theatres/#{theatre.id}/skip_vote", params: { post_id: 'invalid' }
-      }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'records a vote and returns the current vote status before majority' do
-      sign_in_as(member)
-
-      expect { do_request }.to change(TheatreSkipVote, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skipped']).to eq(false)
-      expect(json['post_id']).to eq(niconico_post.id)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 1,
-        'required_count' => 2,
-        'watching_users_count' => 3,
-        'voted' => true
-      )
-    end
-
-    it 'finalizes skip when votes reach majority and stores voters and tag snapshots' do
-      tag = create(:tag, name: 'skip-target')
-      PostTag.create!(post: niconico_post, tag:)
-
-      TheatreSkipVote.create!(theatre:, post: niconico_post, user: member)
-      sign_in_as(other_user)
-
-      expect { do_request }
-        .to change(TheatreSkipEvent, :count).by(1)
-        .and change(TheatreSkipEventVoter, :count).by(2)
-        .and change(TheatreSkipEventTag, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skipped']).to eq(true)
-      expect([second_niconico_post.id, youtube_post.id]).to include(json['post_id'])
-
-      event = TheatreSkipEvent.last
-      expect(event.post).to eq(niconico_post)
-      expect(event.users).to contain_exactly(member, other_user)
-      expect(event.tags).to contain_exactly(tag)
-      expect(TheatreSkipVote.where(theatre:, post: niconico_post)).to be_empty
-    end
-
-    it 'does not record a vote when requested post is no longer current' do
-      theatre.update!(current_post: second_niconico_post)
-      sign_in_as(member)
-
-      expect { do_request }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:conflict)
-      expect(json['post_id']).to eq(second_niconico_post.id)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 0,
-        'voted' => false
-      )
-    end
-  end
-
-  describe 'DELETE /theatres/:id/skip_vote' do
-    let(:requested_post_id) { niconico_post.id }
-
-    before do
-      theatre.update!(current_post: niconico_post, current_post_started_at: 10.seconds.ago)
-      TheatreWatchingUser.create!(theatre:, user: member, expires_at: 10.seconds.from_now)
-      TheatreSkipVote.create!(theatre:, post: niconico_post, user: member)
-      sign_in_as(member)
-    end
-
-    it 'removes the current user vote' do
-      expect {
-        delete "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-      }.to change(TheatreSkipVote, :count).by(-1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 0,
-        'required_count' => 1,
-        'watching_users_count' => 1,
-        'voted' => false
-      )
-    end
-
-    it 'does not remove a vote when requested post is no longer current' do
-      theatre.update!(current_post: second_niconico_post)
-
-      expect {
-        delete "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-      }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:conflict)
-      expect(json['post_id']).to eq(second_niconico_post.id)
-    end
-  end
-
-  describe 'GET /theatres/:id/skip_events' do
-    before do
-      sign_in_as(member)
-    end
-
-    it 'does not expose skip voters' do
-      event = TheatreSkipEvent.create!(
-        theatre:,
-        post: niconico_post,
-        skipped_by_user: member,
-        created_at: Time.current
-      )
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: member)
-
-      get "/theatres/#{theatre.id}/skip_events"
-
-      expect(response).to have_http_status(:ok)
-      expect(json.first).to include(
-        'id' => event.id,
-        'theatre_id' => theatre.id
-      )
-      expect(json.first).not_to have_key('voters')
-      expect(json.first).not_to have_key('skipped_by_user')
-    end
-  end
-
-  describe 'GET /theatres/:id/post_selection_weights' do
-    before do
-      theatre.update!(current_post: niconico_post)
-      TheatreWatchingUser.create!(theatre:, user: member, expires_at: 10.seconds.from_now)
-      sign_in_as(member)
-    end
-
-    it 'returns tag penalties and candidate weights for the current watchers' do
-      tag = create(:tag, name: 'heavy-tag')
-      PostTag.create!(post: second_niconico_post, tag:)
-      event = TheatreSkipEvent.create!(
-        theatre:,
-        post: niconico_post,
-        skipped_by_user: member,
-        created_at: Time.current
-      )
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: member)
-      TheatreSkipEventTag.create!(theatre_skip_event: event, tag:)
-
-      get "/theatres/#{theatre.id}/post_selection_weights"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['tag_penalties'].first['penalty']).to eq(1)
-      expect(json['lightest_posts'].first['post']['id']).to eq(second_niconico_post.id)
-      expect(json['lightest_posts'].first['penalty']).to eq(1)
-    end
-  end
 end

backend/spec/requests/users_spec.rb

@@ -1,268 +1,110 @@
-require 'rails_helper'
+require "rails_helper"
 
-RSpec.describe 'Users', type: :request do
-  let(:remote_ip) { '203.0.113.10' }
 
-  before do
-    allow_any_instance_of(ActionDispatch::Request)
-      .to receive(:remote_ip)
-      .and_return(remote_ip)
+RSpec.describe "Users", type: :request do
+  describe "POST /users" do
+    it "creates guest user and returns code" do
+      post "/users"
+      expect(response).to have_http_status(:ok)
+      expect(json["code"]).to be_present
+      expect(json["user"]["role"]).to eq("guest")
+    end
   end
 
-  def auth_headers(user)
-    { 'X-Transfer-Code' => user.inheritance_code }
+  describe "POST /users/code/renew" do
+    it "returns 401 when not logged in" do
+      sign_out
+      post "/users/code/renew"
+      expect(response).to have_http_status(:unauthorized)
+    end
   end
 
-  describe 'POST /users' do
-    it 'creates guest user, IpAddress and UserIp, and returns code' do
-      expect {
-        post '/users'
-      }.to change(User, :count).by(1)
-        .and change(IpAddress, :count).by(1)
-        .and change(UserIp, :count).by(1)
+  describe "PUT /users/:id" do
+    let(:user) { create(:user, name: "old-name", role: "guest") }
+
+    it "returns 401 when current_user id mismatch" do
+      sign_in_as(create(:user))
+      put "/users/#{user.id}", params: { name: "new-name" }
+      expect(response).to have_http_status(:unauthorized)
+    end
+
+    it "returns 400 when name is blank" do
+      sign_in_as(user)
+      put "/users/#{user.id}", params: { name: "   " }
+      expect(response).to have_http_status(:bad_request)
+    end
+
+    it "updates name and returns 201 with user slice" do
+      sign_in_as(user)
+      put "/users/#{user.id}", params: { name: "new-name" }
 
       expect(response).to have_http_status(:created)
-      expect(json['code']).to be_present
-      expect(json['user']['role']).to eq('guest')
+      expect(json["id"]).to eq(user.id)
+      expect(json["name"]).to eq("new-name")
 
-      user = User.last
-      ip_address = IpAddress.find_by(ip_address: IPAddr.new(remote_ip).hton)
-
-      expect(user.role).to eq('guest')
-      expect(ip_address).to be_present
-      expect(UserIp.exists?(user:, ip_address:)).to eq(true)
-    end
-
-    it 'returns 403 and does not create user when current IP address is banned' do
-      IpAddress.create!(
-        ip_address: IPAddr.new(remote_ip).hton,
-        banned_at: Time.current
-      )
-
-      expect {
-        post '/users'
-      }.not_to change(User, :count)
-
-      expect(response).to have_http_status(:forbidden)
-      expect(UserIp.count).to eq(0)
+      user.reload
+      expect(user.name).to eq("new-name")
     end
   end
 
-  describe 'POST /users/code/renew' do
-    it 'returns 401 when not logged in' do
-      post '/users/code/renew'
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns 403 when current user is banned' do
-      user = create(:user, :banned)
-
-      post '/users/code/renew', headers: auth_headers(user)
-
-      expect(response).to have_http_status(:forbidden)
-    end
-
-    it 'returns 403 when current IP address is banned' do
-      user = create(:user)
-
-      IpAddress.create!(
-        ip_address: IPAddr.new(remote_ip).hton,
-        banned_at: Time.current
-      )
-
-      post '/users/code/renew', headers: auth_headers(user)
-
-      expect(response).to have_http_status(:forbidden)
-    end
-  end
-
-  describe 'PUT /users/:id' do
-    let(:user) { create(:user, name: 'old-name', role: 'guest') }
-
-    it 'returns 401 when current_user id mismatch' do
-      other_user = create(:user)
-
-      put "/users/#{user.id}",
-          params: { name: 'new-name' },
-          headers: auth_headers(other_user)
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns 422 when name is blank' do
-      put "/users/#{user.id}",
-          params: { name: '   ' },
-          headers: auth_headers(user)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          'name' => ['名前は必須です．'])
-    end
-
-    it 'updates name and returns user slice' do
-      put "/users/#{user.id}",
-          params: { name: 'new-name' },
-          headers: auth_headers(user)
-
+  describe "POST /users/verify" do
+    it "returns valid:false when code not found" do
+      post "/users/verify", params: { code: "nope" }
       expect(response).to have_http_status(:ok)
-      expect(json['id']).to eq(user.id)
-      expect(json['name']).to eq('new-name')
-
-      user.reload
-      expect(user.name).to eq('new-name')
+      expect(json["valid"]).to eq(false)
     end
 
-    it 'returns 403 when current user is banned' do
-      user.update!(banned_at: Time.current)
+    it "creates IpAddress and UserIp, and returns valid:true with user slice" do
+      user = create(:user, inheritance_code: SecureRandom.uuid, role: "guest")
 
-      put "/users/#{user.id}",
-          params: { name: 'new-name' },
-          headers: auth_headers(user)
-
-      expect(response).to have_http_status(:forbidden)
-
-      user.reload
-      expect(user.name).to eq('old-name')
-    end
-
-    it 'returns 403 when current IP address is banned' do
-      IpAddress.create!(
-        ip_address: IPAddr.new(remote_ip).hton,
-        banned_at: Time.current
-      )
-
-      put "/users/#{user.id}",
-          params: { name: 'new-name' },
-          headers: auth_headers(user)
-
-      expect(response).to have_http_status(:forbidden)
-
-      user.reload
-      expect(user.name).to eq('old-name')
-    end
-  end
-
-  describe 'POST /users/verify' do
-    it 'returns valid:false when code not found' do
-      post '/users/verify', params: { code: 'nope' }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['valid']).to eq(false)
-    end
-
-    it 'returns 403 when current IP address is banned' do
-      user = create(:user, inheritance_code: SecureRandom.uuid, role: 'guest')
-
-      IpAddress.create!(
-        ip_address: IPAddr.new(remote_ip).hton,
-        banned_at: Time.current
-      )
+      # request.remote_ip を固定
+      allow_any_instance_of(ActionDispatch::Request).to receive(:remote_ip).and_return("203.0.113.10")
 
       expect {
-        post '/users/verify', params: { code: user.inheritance_code }
-      }.not_to change(UserIp, :count)
-
-      expect(response).to have_http_status(:forbidden)
-    end
-
-    it 'returns 403 when verified user is banned' do
-      user = create(
-        :user,
-        :banned,
-        inheritance_code: SecureRandom.uuid,
-        role: 'guest'
-      )
-
-      expect {
-        post '/users/verify', params: { code: user.inheritance_code }
-      }.not_to change(UserIp, :count)
-
-      expect(response).to have_http_status(:forbidden)
-    end
-
-    it 'creates IpAddress and UserIp, and returns valid:true with user slice' do
-      user = create(:user, inheritance_code: SecureRandom.uuid, role: 'guest')
-
-      expect {
-        post '/users/verify', params: { code: user.inheritance_code }
-      }.to change(UserIp, :count).by(1)
-        .and change(IpAddress, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['valid']).to eq(true)
-      expect(json['user']['id']).to eq(user.id)
-      expect(json['user']['inheritance_code']).to eq(user.inheritance_code)
-      expect(json['user']['role']).to eq('guest')
-
-      ip_address = IpAddress.find_by(ip_address: IPAddr.new(remote_ip).hton)
-      expect(ip_address).to be_present
-      expect(UserIp.exists?(user:, ip_address:)).to eq(true)
-    end
-
-    it 'is idempotent for same user and same IP address' do
-      user = create(:user, inheritance_code: SecureRandom.uuid, role: 'guest')
-
-      post '/users/verify', params: { code: user.inheritance_code }
-      expect(response).to have_http_status(:ok)
-
-      expect {
-        post '/users/verify', params: { code: user.inheritance_code }
-      }.not_to change(UserIp, :count)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['valid']).to eq(true)
-    end
-
-    it 'creates another UserIp for same user and different IP address' do
-      user = create(:user, inheritance_code: SecureRandom.uuid, role: 'guest')
-
-      post '/users/verify', params: { code: user.inheritance_code }
-      expect(response).to have_http_status(:ok)
-
-      allow_any_instance_of(ActionDispatch::Request)
-        .to receive(:remote_ip)
-        .and_return('203.0.113.11')
-
-      expect {
-        post '/users/verify', params: { code: user.inheritance_code }
+        post "/users/verify", params: { code: user.inheritance_code }
       }.to change(UserIp, :count).by(1)
 
       expect(response).to have_http_status(:ok)
-      expect(json['valid']).to eq(true)
+      expect(json["valid"]).to eq(true)
+      expect(json["user"]["id"]).to eq(user.id)
+      expect(json["user"]["inheritance_code"]).to eq(user.inheritance_code)
+      expect(json["user"]["role"]).to eq("guest")
+
+      # ついでに IpAddress もできてることを確認（ipの保存形式がバイナリでも count で見れる）
+      expect(IpAddress.count).to be >= 1
+    end
+
+    it "is idempotent for same user+ip (does not create duplicate UserIp)" do
+      user = create(:user, inheritance_code: SecureRandom.uuid, role: "guest")
+      allow_any_instance_of(ActionDispatch::Request).to receive(:remote_ip).and_return("203.0.113.10")
+
+      post "/users/verify", params: { code: user.inheritance_code }
+      expect(response).to have_http_status(:ok)
+
+      expect {
+        post "/users/verify", params: { code: user.inheritance_code }
+      }.not_to change(UserIp, :count)
+
+      expect(response).to have_http_status(:ok)
+      expect(json["valid"]).to eq(true)
     end
   end
 
-  describe 'GET /users/me' do
-    it 'returns 404 when code not found' do
-      get '/users/me', params: { code: 'nope' }
-
+  describe "GET /users/me" do
+    it "returns 404 when code not found" do
+      get "/users/me", params: { code: "nope" }
       expect(response).to have_http_status(:not_found)
     end
 
-    it 'returns user slice when found' do
-      user = create(:user, inheritance_code: SecureRandom.uuid, name: 'me', role: 'guest')
-
-      get '/users/me', params: { code: user.inheritance_code }
+    it "returns user slice when found" do
+      user = create(:user, inheritance_code: SecureRandom.uuid, name: "me", role: "guest")
+      get "/users/me", params: { code: user.inheritance_code }
 
       expect(response).to have_http_status(:ok)
-      expect(json['id']).to eq(user.id)
-      expect(json['name']).to eq('me')
-      expect(json['inheritance_code']).to eq(user.inheritance_code)
-      expect(json['role']).to eq('guest')
-    end
-
-    it 'returns 403 when current IP address is banned' do
-      user = create(:user, inheritance_code: SecureRandom.uuid)
-
-      IpAddress.create!(
-        ip_address: IPAddr.new(remote_ip).hton,
-        banned_at: Time.current
-      )
-
-      get '/users/me', params: { code: user.inheritance_code }
-
-      expect(response).to have_http_status(:forbidden)
+      expect(json["id"]).to eq(user.id)
+      expect(json["name"]).to eq("me")
+      expect(json["inheritance_code"]).to eq(user.inheritance_code)
+      expect(json["role"]).to eq("guest")
     end
   end
 end

backend/spec/requests/wiki_body_search_pending_spec.rb

@@ -1,27 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki body search', type: :request do
-  let!(:user) { create_member_user! }
-
-  it 'searches wiki pages by body text' do
-    pending '#336 で対応予定'
-
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: 'wiki_body_search_hit'),
-        body: 'unique body keyword for wiki search',
-        created_by_user: user,
-        message: 'init')
-
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: 'wiki_body_search_miss'),
-        body: 'ordinary body',
-        created_by_user: user,
-        message: 'init')
-
-    get '/wiki/search', params: { body: 'unique body keyword' }
-
-    expect(response).to have_http_status(:ok)
-    expect(json.map { |page| page['title'] }).to include('wiki_body_search_hit')
-    expect(json.map { |page| page['title'] }).not_to include('wiki_body_search_miss')
-  end
-end

backend/spec/requests/wiki_conflict_spec.rb

@@ -1,42 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki conflict handling', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  it 'returns 409 when base_revision_id is stale' do
-    page =
-        Wiki::Commit.create_content!(
-            tag_name: TagName.create!(name: 'wiki_conflict_request'),
-            body: 'first',
-            created_by_user: user,
-            message: 'init')
-
-    stale_id = page.current_revision.id
-
-    Wiki::Commit.content!(
-        page:,
-        body: 'second',
-        created_user: user,
-        message: 'other edit',
-        base_revision_id: stale_id)
-
-    put "/wiki/#{ page.id }",
-        params: {
-          title: 'wiki_conflict_request',
-          body: 'third',
-          message: 'stale',
-          base_revision_id: stale_id,
-        },
-        headers: auth_headers(user)
-
-    expect(response).to have_http_status(:conflict)
-
-    page.reload
-    expect(page.body).to eq('second')
-    expect(page.current_revision.message).to eq('other edit')
-  end
-end

backend/spec/requests/wiki_history_integrity_spec.rb

@@ -1,196 +0,0 @@
-require 'cgi'
-require 'rails_helper'
-
-RSpec.describe 'Wiki history integrity', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  def create_wiki_page title:, body: 'body', message: 'init', user: self.user
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message:)
-  end
-
-  describe 'POST /wiki' do
-    it 'creates wiki_page, wiki_revision, and wiki_version atomically' do
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_create_atomic',
-               body: "a\nb\nc",
-               message: 'initial commit',
-             },
-             headers: auth_headers(user)
-      }
-          .to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:created)
-
-      page = WikiPage.find(json.fetch('id'))
-      revision = page.current_revision
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_create_atomic')
-      expect(page.body).to eq("a\nb\nc")
-
-      expect(revision).to be_content
-      expect(revision.message).to eq('initial commit')
-      expect(revision.lines_count).to eq(3)
-
-      expect(version).to have_attributes(
-        version_no: 1,
-        event_type: 'create',
-        title: 'wiki_history_create_atomic',
-        body: "a\nb\nc",
-        reason: 'initial commit',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'returns 422 and creates nothing when normalised body is blank' do
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_blank_body',
-               body: "\r\n\r\n",
-               message: 'blank',
-             },
-             headers: auth_headers(user)
-      }
-          .not_to change(WikiPage, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_blank_body' })).not_to exist
-    end
-
-    it 'returns 422 and creates no partial page when title already exists' do
-      create_wiki_page(title: 'wiki_history_duplicate_title', body: 'first')
-
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_duplicate_title',
-               body: 'second',
-               message: 'duplicate',
-             },
-             headers: auth_headers(user)
-      }
-          .not_to change(WikiPage, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_duplicate_title' }).count).to eq(1)
-    end
-  end
-
-  describe 'PUT /wiki/:id' do
-    it 'updates body and records wiki_revision and wiki_version' do
-      page = create_wiki_page(title: 'wiki_history_update_body', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        put "/wiki/#{ page.id }",
-            params: {
-              title: 'wiki_history_update_body',
-              body: 'after',
-              message: 'edit body',
-              base_revision_id: current_id,
-            },
-            headers: auth_headers(user)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_update_body')
-      expect(page.body).to eq('after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'wiki_history_update_body',
-        body: 'after',
-        reason: 'edit body',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'renames title and records wiki_version with new title' do
-      page = create_wiki_page(title: 'wiki_history_rename_before', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        put "/wiki/#{ page.id }",
-            params: {
-              title: 'wiki_history_rename_after',
-              body: 'after',
-              message: 'rename',
-              base_revision_id: current_id,
-            },
-            headers: auth_headers(user)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_rename_after')
-      expect(page.body).to eq('after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'wiki_history_rename_after',
-        body: 'after',
-        reason: 'rename',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'does not change title, body, revision, or version on stale base_revision_id' do
-      page = create_wiki_page(title: 'wiki_history_conflict_page', body: 'first')
-      stale_id = page.current_revision.id
-
-      Wiki::Commit.content!(
-          page:,
-          body: 'second',
-          created_user: user,
-          message: 'other edit',
-          base_revision_id: stale_id)
-
-      page.reload
-      current_title = page.title
-      current_body = page.body
-      revision_count = page.wiki_revisions.count
-      version_count = page.wiki_versions.count
-
-      put "/wiki/#{ page.id }",
-          params: {
-            title: 'wiki_history_conflict_renamed',
-            body: 'third',
-            message: 'stale edit',
-            base_revision_id: stale_id,
-          },
-          headers: auth_headers(user)
-
-      expect(response).to have_http_status(:conflict)
-
-      page.reload
-      expect(page.title).to eq(current_title)
-      expect(page.body).to eq(current_body)
-      expect(page.wiki_revisions.count).to eq(revision_count)
-      expect(page.wiki_versions.count).to eq(version_count)
-    end
-  end
-end

backend/spec/requests/wiki_restore_pending_spec.rb

@@ -1,37 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki restore', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  it 'restores wiki page to previous version' do
-    pending '#337 で対応予定'
-
-    page =
-        Wiki::Commit.create_content!(
-            tag_name: TagName.create!(name: 'wiki_restore_page'),
-            body: 'v1',
-            created_by_user: user,
-            message: 'init')
-
-    v1 = page.wiki_versions.order(:version_no).last
-
-    Wiki::Commit.content!(
-        page:,
-        body: 'v2',
-        created_user: user,
-        message: 'edit',
-        base_revision_id: page.current_revision.id)
-
-    post "/wiki/#{ page.id }/restore",
-         params: { version_no: v1.version_no },
-         headers: auth_headers(user)
-
-    expect(response).to have_http_status(:ok)
-    expect(page.reload.body).to eq('v1')
-    expect(page.wiki_versions.order(:version_no).last.event_type).to eq('restore')
-  end
-end

backend/spec/requests/wiki_spec.rb

@@ -4,19 +4,13 @@ require 'securerandom'
 
 
 RSpec.describe 'Wiki API', type: :request do
-  def auth_headers(user)
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
   let!(:user) { create_member_user! }
 
   let!(:tn) { TagName.create!(name: 'spec_wiki_title') }
   let!(:page) do
-    Wiki::Commit.create_content!(
-        tag_name: tn,
-        body: 'init',
-        created_by_user: user,
-        message: 'init')
+    WikiPage.create!(tag_name: tn, created_user: user, updated_user: user).tap do |p|
+      Wiki::Commit.content!(page: p, body: 'init', created_user: user, message: 'init')
+    end
   end
 
   describe 'GET /wiki' do
@@ -43,12 +37,11 @@ RSpec.describe 'Wiki API', type: :request do
     context 'when wiki page exists' do
       it 'returns wiki page with title' do
         request
-
         expect(response).to have_http_status(:ok)
 
         expect(json).to include(
-            'id' => page.id,
-            'title' => 'spec_wiki_title')
+            'id'        => page.id,
+            'title'     => 'spec_wiki_title')
       end
     end
 
@@ -57,7 +50,6 @@ RSpec.describe 'Wiki API', type: :request do
 
       it 'returns 404' do
         request
-
         expect(response).to have_http_status(:not_found)
       end
     end
@@ -107,34 +99,25 @@ RSpec.describe 'Wiki API', type: :request do
         end
             .to change(WikiPage, :count).by(1)
             .and change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
 
         expect(response).to have_http_status(:created)
 
         page_id = json.fetch('id')
         expect(json.fetch('title')).to eq('TestPage')
 
-        created_page = WikiPage.find(page_id)
-        version = created_page.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          version_no: 1,
-          event_type: 'create',
-          title: 'TestPage',
-          body: "a\nb\nc",
-          created_by_user_id: member.id
-        )
-
-        rev = created_page.current_revision
+        page = WikiPage.find(page_id)
+        rev = page.current_revision
         expect(rev).to be_present
         expect(rev).to be_content
         expect(rev.message).to eq('init')
 
-        expect(created_page.body).to eq("a\nb\nc")
+        # body が復元できること
+        expect(page.body).to eq("a\nb\nc")
 
+        # 行数とリレーションの整合
         expect(rev.lines_count).to eq(3)
         expect(rev.wiki_revision_lines.order(:position).pluck(:position)).to eq([0, 1, 2])
-        expect(rev.wiki_lines.pluck(:body)).to match_array(['a', 'b', 'c'])
+        expect(rev.wiki_lines.pluck(:body)).to match_array(%w[a b c])
       end
 
       it 'reuses existing WikiLine rows by sha256' do
@@ -152,41 +135,6 @@ RSpec.describe 'Wiki API', type: :request do
         # "a" の WikiLine が増殖しない（1行のはず）
         expect(WikiLine.where(body: 'a').count).to eq(1)
       end
-
-      it 'deduplicates duplicated new lines before upsert' do
-        duplicated = 'duplicated_line_for_wiki_line_upsert_spec'
-
-        post endpoint,
-             params: { title: 'DuplicateNewLine', body: "#{ duplicated }\n#{ duplicated }" },
-             headers: auth_headers(member)
-
-        expect(response).to have_http_status(:created)
-
-        page = WikiPage.find(json.fetch('id'))
-        rev = page.current_revision
-
-        expect(rev.lines_count).to eq(2)
-        expect(WikiLine.where(body: duplicated).count).to eq(1)
-        expect(rev.wiki_revision_lines.count).to eq(2)
-        expect(rev.wiki_revision_lines.pluck(:wiki_line_id).uniq.size).to eq(1)
-      end
-
-      it 'normalises CRLF and strips trailing newlines' do
-        post endpoint,
-             params: { title: 'NormalisedBody', body: "a\r\nb\r\n\r\n", message: 'normalise' },
-             headers: auth_headers(member)
-
-        expect(response).to have_http_status(:created)
-
-        page = WikiPage.find(json.fetch('id'))
-        rev = page.current_revision
-        version = page.wiki_versions.order(:version_no).last
-
-        expect(page.body).to eq("a\nb")
-        expect(version.body).to eq("a\nb")
-        expect(rev.lines_count).to eq(2)
-        expect(rev.wiki_lines.order('wiki_revision_lines.position').map(&:body)).to eq(['a', 'b'])
-      end
     end
   end
 
@@ -198,14 +146,17 @@ RSpec.describe 'Wiki API', type: :request do
       { 'X-Transfer-Code' => user.inheritance_code }
     end
 
-    let!(:test_tag_name) { TagName.create!(name: 'TestPage') }
-
+    #let!(:page) { create(:wiki_page, title: 'TestPage') }
     let!(:page) do
-      Wiki::Commit.create_content!(
-          tag_name: test_tag_name,
-          body: "a\nb",
-          created_by_user: member,
-          message: 'init')
+      build(:wiki_page, title: 'TestPage').tap do |p|
+        puts p.errors.full_messages unless p.valid?
+        p.save!
+      end
+    end
+
+    before do
+      # 初期版を 1 つ作っておく（更新が“2版目”になるように）
+      Wiki::Commit.content!(page: page, body: "a\nb", created_user: member, message: 'init')
     end
 
     context 'when not logged in' do
@@ -231,6 +182,14 @@ RSpec.describe 'Wiki API', type: :request do
             headers: auth_headers(member)
         expect(response).to have_http_status(:unprocessable_entity)
       end
+
+      it 'returns 422 when title mismatched (if you forbid rename here)' do
+        put "/wiki/#{page.id}",
+            params: { title: 'OtherTitle', body: 'x' },
+            headers: auth_headers(member)
+        # 君の controller 例だと title 変更は 422 にしてた
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
     end
 
     context 'when success' do
@@ -241,18 +200,7 @@ RSpec.describe 'Wiki API', type: :request do
           put "/wiki/#{page.id}",
               params: { title: 'TestPage', body: "x\ny", message: 'edit', base_revision_id: current_id },
               headers: auth_headers(member)
-        end
-            .to change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-
-        version = page.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          event_type: 'update',
-          title: 'TestPage',
-          body: "x\ny",
-          created_by_user_id: member.id
-        )
+        end.to change(WikiRevision, :count).by(1)
 
         expect(response).to have_http_status(:ok)
 
@@ -263,60 +211,25 @@ RSpec.describe 'Wiki API', type: :request do
         expect(page.body).to eq("x\ny")
         expect(rev.base_revision_id).to eq(current_id)
       end
-
-      it 'wiki body だけを変更しても tag version は作成しない' do
-        linked_tag_name = TagName.create!(name: 'wiki_body_only_tag')
-        linked_tag = Tag.create!(tag_name: linked_tag_name, category: :general)
-
-        TagVersionRecorder.record!(
-            tag: linked_tag,
-            event_type: :create,
-            created_by_user: member)
-
-        linked_page =
-            Wiki::Commit.create_content!(
-                tag_name: linked_tag_name,
-                body: 'before',
-                created_by_user: member,
-                message: 'init')
-
-        current_id = linked_page.current_revision.id
-        before_count = linked_tag.reload.tag_versions.count
-
-        expect {
-          put "/wiki/#{ linked_page.id }",
-              params: {
-                title: 'wiki_body_only_tag',
-                body: 'after',
-                message: 'edit',
-                base_revision_id: current_id,
-              },
-              headers: auth_headers(member)
-        }
-            .to change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(linked_tag.reload.tag_versions.count).to eq(before_count)
-      end
     end
 
-    context 'when conflict' do
-      it 'returns 409 when base_revision_id mismatches' do
-        # 先に別ユーザ（同じ member でもOK）が 1 回更新して先頭を進める
-        Wiki::Commit.content!(page: page, body: "zzz", created_user: member, message: 'other edit')
-        page.reload
+    # TODO: コンフリクト未実装のため，実装したらコメント外す．
+    # context 'when conflict' do
+    #   it 'returns 409 when base_revision_id mismatches' do
+    #     # 先に別ユーザ（同じ member でもOK）が 1 回更新して先頭を進める
+    #     Wiki::Commit.content!(page: page, body: "zzz", created_user: member, message: 'other edit')
+    #     page.reload
 
-        stale_id = page.wiki_revisions.order(:id).first.id # わざと古い id
-        put "/wiki/#{page.id}",
-            params: { title: 'TestPage', body: 'x', base_revision_id: stale_id },
-            headers: auth_headers(member)
+    #     stale_id = page.wiki_revisions.order(:id).first.id # わざと古い id
+    #     put "/wiki/#{page.id}",
+    #         params: { title: 'TestPage', body: 'x', base_revision_id: stale_id },
+    #         headers: auth_headers(member)
 
-        expect(response).to have_http_status(:conflict)
-        json = JSON.parse(response.body)
-        expect(json['error']).to eq('conflict')
-      end
-    end
+    #     expect(response).to have_http_status(:conflict)
+    #     json = JSON.parse(response.body)
+    #     expect(json['error']).to eq('conflict')
+    #   end
+    # end
 
     context 'when page not found' do
       it 'returns 404' do
@@ -348,17 +261,14 @@ RSpec.describe 'Wiki API', type: :request do
 
   describe 'GET /wiki/search' do
     before do
-      Wiki::Commit.create_content!(
-          tag_name: TagName.create!(name: 'spec_wiki_title_2'),
-          body: 'search body 2',
-          created_by_user: user,
-          message: 'init')
+      # 追加で検索ヒット用
+      TagName.create!(name: 'spec_wiki_title_2')
+      WikiPage.create!(tag_name: TagName.find_by!(name: 'spec_wiki_title_2'),
+                       created_user: user, updated_user: user)
 
-      Wiki::Commit.create_content!(
-          tag_name: TagName.create!(name: 'unrelated_title'),
-          body: 'unrelated body',
-          created_by_user: user,
-          message: 'init')
+      TagName.create!(name: 'unrelated_title')
+      WikiPage.create!(tag_name: TagName.find_by!(name: 'unrelated_title'),
+                       created_user: user, updated_user: user)
     end
 
     it 'returns up to 20 pages filtered by title like' do
@@ -368,9 +278,7 @@ RSpec.describe 'Wiki API', type: :request do
       expect(json).to be_an(Array)
 
       titles = json.map { |p| p['title'] }
-
-      expect(titles).to include('spec_wiki_title')
-      expect(titles).to include('spec_wiki_title_2')
+      expect(titles).to include('spec_wiki_title', 'spec_wiki_title_2')
       expect(titles).not_to include('unrelated_title')
     end
 
@@ -421,12 +329,7 @@ RSpec.describe 'Wiki API', type: :request do
     it 'returns empty array when page has no revisions and filtered by id' do
       # 別ページを作って revision 無し
       tn2 = TagName.create!(name: 'spec_no_rev')
-      # 異常データ: revision 無し WikiPage を直接作る
-      p2 = WikiPage.create!(
-          tag_name: tn2,
-          body: 'init',
-          created_user: user,
-          updated_user: user)
+      p2 = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
 
       get "/wiki/changes?id=#{p2.id}"
       expect(response).to have_http_status(:ok)
@@ -495,68 +398,29 @@ RSpec.describe 'Wiki API', type: :request do
       expect(json['older_revision_id']).to eq(rev_a.id)
       expect(json['newer_revision_id']).to eq(page.current_revision.id)
     end
-  end
 
-  describe 'Wiki::Commit.redirect!' do
-    it 'raises because redirect revisions are deprecated' do
-      target_tag_name = TagName.create!(name: 'redirect_deprecated_target')
-      target =
-          Wiki::Commit.create_content!(
-              tag_name: target_tag_name,
-              body: 'target',
-              created_by_user: user,
-              message: 'init')
+    it 'returns 422 when "to" is redirect revision' do
+      # redirect revision を作る
+      tn2 = TagName.create!(name: 'redirect_target')
+      target = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
 
-      expect {
-        Wiki::Commit.redirect!(
-          page: page,
-          redirect_page: target,
-          created_user: user,
-          message: 'redirect',
-          base_revision_id: page.current_revision.id
-        )
-      }.to raise_error(RuntimeError, '廃止しました．')
+      Wiki::Commit.redirect!(page: page, redirect_page: target, created_user: user, message: 'redir')
+      redirect_rev = page.current_revision
+      expect(redirect_rev).to be_redirect
+
+      get "/wiki/#{page.id}/diff?from=#{rev_a.id}&to=#{redirect_rev.id}"
+      expect(response).to have_http_status(:unprocessable_entity)
+    end
+
+    it 'returns 422 when "from" is redirect revision' do
+      tn2 = TagName.create!(name: 'redirect_target2')
+      target = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
+
+      Wiki::Commit.redirect!(page: page, redirect_page: target, created_user: user, message: 'redir2')
+      redirect_rev = page.current_revision
+
+      get "/wiki/#{page.id}/diff?from=#{redirect_rev.id}&to=#{rev_b.id}"
+      expect(response).to have_http_status(:unprocessable_entity)
     end
   end
-
-  it 'wiki title を変更すると対応する tag の version を作成する' do
-    linked_tag_name = TagName.create!(name: 'wiki_linked_tag_for_version')
-    linked_tag = Tag.create!(tag_name: linked_tag_name, category: :general)
-
-    linked_page =
-        Wiki::Commit.create_content!(
-            tag_name: linked_tag_name,
-            body: 'before',
-            created_by_user: user,
-            message: 'init')
-
-    current_id = linked_page.current_revision.id
-
-    expect {
-      put "/wiki/#{ linked_page.id }",
-          params: {
-            title: 'wiki_linked_tag_for_version_renamed',
-            body: 'after',
-            message: 'rename',
-            base_revision_id: current_id,
-          },
-          headers: auth_headers(user)
-    }
-        .to change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(1)
-        .and change { linked_tag.reload.tag_versions.count }.by(2)
-
-    expect(response).to have_http_status(:ok)
-
-    linked_tag.reload
-    expect(linked_tag.name).to eq('wiki_linked_tag_for_version_renamed')
-
-    versions = linked_tag.tag_versions.order(:version_no)
-
-    expect(versions.first.event_type).to eq('create')
-    expect(versions.first.name).to eq('wiki_linked_tag_for_version')
-
-    expect(versions.second.event_type).to eq('update')
-    expect(versions.second.name).to eq('wiki_linked_tag_for_version_renamed')
-  end
 end

backend/spec/requests/wiki_title_collision_spec.rb

@@ -1,62 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki title collision', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  def create_wiki_page title:, body:
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  it 'returns 422 when renaming wiki title to existing title' do
-    source = create_wiki_page(title: 'wiki_collision_source', body: 'source body')
-    create_wiki_page(title: 'wiki_collision_target', body: 'target body')
-
-    source_revision_count = source.wiki_revisions.count
-    source_version_count = source.wiki_versions.count
-    old_title = source.title
-    old_body = source.body
-
-    put "/wiki/#{ source.id }",
-        params: {
-          title: 'wiki_collision_target',
-          body: 'new body',
-          message: 'rename collision',
-          base_revision_id: source.current_revision.id,
-        },
-        headers: auth_headers(user)
-
-    expect(response).to have_http_status(:unprocessable_entity)
-
-    source.reload
-
-    expect(source.title).to eq(old_title)
-    expect(source.body).to eq(old_body)
-    expect(source.wiki_revisions.count).to eq(source_revision_count)
-    expect(source.wiki_versions.count).to eq(source_version_count)
-  end
-
-  it 'returns 422 when creating wiki with existing title' do
-    create_wiki_page(title: 'wiki_collision_create', body: 'already exists')
-
-    expect {
-      post '/wiki',
-           params: {
-             title: 'wiki_collision_create',
-             body: 'new body',
-             message: 'duplicate create',
-           },
-           headers: auth_headers(user)
-    }
-        .not_to change(WikiPage, :count)
-
-    expect(response).to have_http_status(:unprocessable_entity)
-  end
-end

backend/spec/services/version_recorder_spec.rb

@@ -1,85 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe VersionRecorder do
-  let(:member) { create(:user, :member) }
-
-  let(:post_record) do
-    Post.create!(
-        title: 'version recorder post',
-        url: 'https://example.com/version-recorder-post')
-  end
-
-  it 'updates record version_no when creating the first version' do
-    version =
-        PostVersionRecorder.record!(
-            post: post_record,
-            event_type: :create,
-            created_by_user: member)
-
-    expect(version.version_no).to eq(1)
-    expect(post_record.reload.version_no).to eq(1)
-  end
-
-  it 'updates record version_no when creating the next version' do
-    PostVersionRecorder.record!(
-        post: post_record,
-        event_type: :create,
-        created_by_user: member)
-
-    post_record.update!(title: 'updated version recorder post')
-
-    version =
-        PostVersionRecorder.record!(
-            post: post_record.reload,
-            event_type: :update,
-            created_by_user: member)
-
-    expect(version.version_no).to eq(2)
-    expect(post_record.reload.version_no).to eq(2)
-  end
-
-  it 'does not create a new version or advance version_no when snapshot is unchanged' do
-    first =
-        PostVersionRecorder.record!(
-            post: post_record,
-            event_type: :create,
-            created_by_user: member)
-
-    expect {
-      version =
-          PostVersionRecorder.record!(
-              post: post_record.reload,
-              event_type: :update,
-              created_by_user: member)
-
-      expect(version).to eq(first)
-    }.not_to change(PostVersion, :count)
-
-    expect(post_record.reload.version_no).to eq(1)
-  end
-
-  it 'raises when record version_no is older than the latest version' do
-    PostVersionRecorder.record!(
-        post: post_record,
-        event_type: :create,
-        created_by_user: member)
-
-    post_record.update!(title: 'updated once')
-
-    PostVersionRecorder.record!(
-        post: post_record.reload,
-        event_type: :update,
-        created_by_user: member)
-
-    post_record.update_columns(version_no: 1)
-
-    post_record.update!(title: 'updated with stale version_no')
-
-    expect {
-      PostVersionRecorder.record!(
-          post: post_record.reload,
-          event_type: :update,
-          created_by_user: member)
-    }.to raise_error(RuntimeError, /version_no/)
-  end
-end

backend/spec/services/wiki/commit_integrity_spec.rb

@@ -1,173 +0,0 @@
-require 'digest'
-require 'rails_helper'
-
-RSpec.describe Wiki::Commit do
-  let(:user) { create_member_user! }
-
-  def create_page title:, body: 'initial body'
-    described_class.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.create_content!' do
-    it 'creates page, revision, and version with normalised body' do
-      expect {
-        described_class.create_content!(
-            tag_name: TagName.create!(name: 'commit_integrity_create'),
-            body: "a\r\nb\r\n\r\n",
-            created_by_user: user,
-            message: 'init')
-      }
-          .to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'commit_integrity_create' })
-      revision = page.current_revision
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.body).to eq("a\nb")
-      expect(revision.lines_count).to eq(2)
-      expect(version.body).to eq("a\nb")
-      expect(version.reason).to eq('init')
-    end
-
-    it 'rejects body that becomes blank after normalisation' do
-      tag_name = TagName.create!(name: 'commit_integrity_blank')
-
-      expect {
-        described_class.create_content!(
-            tag_name:,
-            body: "\r\n\r\n",
-            created_by_user: user,
-            message: 'blank')
-      }
-          .to raise_error(ActiveRecord::RecordInvalid)
-
-      expect(WikiPage.where(tag_name:)).not_to exist
-    end
-  end
-
-  describe '.content!' do
-    it 'updates page body, revision, and version' do
-      page = create_page(title: 'commit_integrity_update', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_id)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.body).to eq('after')
-      expect(version.body).to eq('after')
-      expect(version.reason).to eq('edit')
-    end
-
-    it 'does not record tag_version on body-only wiki update' do
-      tag_name = TagName.create!(name: 'commit_integrity_linked_tag')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      TagVersionRecorder.record!(
-          tag:,
-          event_type: :create,
-          created_by_user: user)
-
-      before_count = tag.reload.tag_versions.count
-
-      described_class.content!(
-          page:,
-          body: 'after',
-          created_user: user,
-          message: 'edit',
-          base_revision_id: page.current_revision.id)
-
-      expect(tag.reload.tag_versions.count).to eq(before_count)
-    end
-
-    it 'raises conflict and leaves page, revision, and version unchanged' do
-      page = create_page(title: 'commit_integrity_conflict', body: 'first')
-      stale_id = page.current_revision.id
-
-      described_class.content!(
-          page:,
-          body: 'second',
-          created_user: user,
-          message: 'second',
-          base_revision_id: stale_id)
-
-      page.reload
-      before_body = page.body
-      before_revision_count = page.wiki_revisions.count
-      before_version_count = page.wiki_versions.count
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'third',
-            created_user: user,
-            message: 'stale',
-            base_revision_id: stale_id)
-      }
-          .to raise_error(Wiki::Commit::Conflict)
-
-      page.reload
-      expect(page.body).to eq(before_body)
-      expect(page.wiki_revisions.count).to eq(before_revision_count)
-      expect(page.wiki_versions.count).to eq(before_version_count)
-    end
-
-    it 'deduplicates duplicated missing wiki lines' do
-      page = create_page(title: 'commit_integrity_dedup', body: 'before')
-      duplicated = 'commit_integrity_duplicate_line'
-
-      described_class.content!(
-          page:,
-          body: "#{ duplicated }\n#{ duplicated }",
-          created_user: user,
-          message: 'dedup',
-          base_revision_id: page.current_revision.id)
-
-      revision = page.reload.current_revision
-
-      expect(WikiLine.where(body: duplicated).count).to eq(1)
-      expect(revision.wiki_revision_lines.count).to eq(2)
-      expect(revision.wiki_revision_lines.pluck(:wiki_line_id).uniq.size).to eq(1)
-    end
-  end
-
-  describe '.redirect!' do
-    it 'raises because redirect revisions are deprecated' do
-      page = create_page(title: 'commit_integrity_redirect_source', body: 'source')
-      target = create_page(title: 'commit_integrity_redirect_target', body: 'target')
-
-      expect {
-        described_class.redirect!(
-            page:,
-            redirect_page: target,
-            created_user: user,
-            message: 'redirect',
-            base_revision_id: page.current_revision.id)
-      }
-          .to raise_error(RuntimeError, '廃止しました．')
-    end
-  end
-end

backend/spec/services/wiki/commit_spec.rb

@@ -1,150 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Wiki::Commit do
-  let(:user) { create_member_user! }
-
-  def create_page(title: 'commit_spec_page', body: 'initial body')
-    tag_name = TagName.create!(name: title)
-
-    Wiki::Commit.create_content!(
-        tag_name:,
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.content!' do
-    it 'stores normalised body in wiki_pages and wiki_versions' do
-      page = create_page(title: 'commit_normalised_page')
-
-      described_class.content!(
-        page:,
-        body: "a\r\nb\r\n\r\n",
-        created_user: user,
-        message: 'init'
-      )
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.body).to eq("a\nb")
-      expect(version.body).to eq("a\nb")
-      expect(page.current_revision.lines_count).to eq(2)
-    end
-
-    it 'deduplicates duplicated missing wiki lines before upsert' do
-      page = create_page(title: 'commit_duplicate_line_page')
-      duplicated = 'commit_duplicate_line'
-
-      described_class.content!(
-        page:,
-        body: "#{ duplicated }\n#{ duplicated }",
-        created_user: user,
-        message: 'init'
-      )
-
-      page.reload
-
-      expect(WikiLine.where(body: duplicated).count).to eq(1)
-      expect(page.current_revision.lines_count).to eq(2)
-      expect(page.current_revision.wiki_revision_lines.count).to eq(2)
-    end
-
-    it 'raises conflict when base_revision_id is stale' do
-      page = create_page(title: 'commit_conflict_page')
-
-      first = described_class.content!(
-        page:,
-        body: 'first',
-        created_user: user,
-        message: 'first'
-      )
-
-      described_class.content!(
-        page:,
-        body: 'second',
-        created_user: user,
-        message: 'second',
-        base_revision_id: first.id
-      )
-
-      expect {
-        described_class.content!(
-          page:,
-          body: 'third',
-          created_user: user,
-          message: 'third',
-          base_revision_id: first.id
-        )
-      }.to raise_error(Wiki::Commit::Conflict)
-    end
-
-    it 'does not record tag version when corresponding tag has no versions' do
-      tag_name = TagName.create!(name: 'commit_linked_tag_without_versions')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-
-      current_revision_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_revision_id)
-      }.to change(WikiVersion, :count).by(1)
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-    end
-
-    it 'does not record tag version when corresponding tag has no versions' do
-      tag_name = TagName.create!(name: 'commit_linked_tag_without_versions')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      current_revision_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_revision_id)
-      }.to change(WikiVersion, :count).by(1)
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-    end
-  end
-
-  describe '.redirect!' do
-    it 'raises because redirect revisions are deprecated' do
-      page = create_page(title: 'commit_redirect_source')
-      target = create_page(title: 'commit_redirect_target')
-
-      expect {
-        described_class.redirect!(
-          page:,
-          redirect_page: target,
-          created_user: user,
-          message: 'redirect'
-        )
-      }.to raise_error(RuntimeError, '廃止しました．')
-    end
-  end
-end

backend/spec/services/wiki_version_recorder_spec.rb

@@ -1,99 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe WikiVersionRecorder do
-  let(:user) { create_member_user! }
-
-  def create_page title:, body: 'body'
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.record!' do
-    it 'records title, body, reason, user, and version number' do
-      page = create_page(title: 'wiki_version_recorder_basic', body: 'body')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'manual reason',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version).to have_attributes(
-        version_no: 2,
-        event_type: 'update',
-        title: 'wiki_version_recorder_basic',
-        body: 'body',
-        reason: 'manual reason',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'does not create duplicated update version for identical snapshot' do
-      page = create_page(title: 'wiki_version_recorder_duplicate', body: 'body')
-
-      described_class.record!(
-          page:,
-          event_type: :update,
-          reason: nil,
-          created_by_user: user)
-
-      before_count = page.reload.wiki_versions.count
-
-      described_class.record!(
-          page:,
-          event_type: :update,
-          reason: nil,
-          created_by_user: user)
-
-      expect(page.reload.wiki_versions.count).to eq(before_count)
-    end
-
-    it 'creates update version when title changes' do
-      page = create_page(title: 'wiki_version_recorder_title_before', body: 'body')
-      page.tag_name.update!(name: 'wiki_version_recorder_title_after')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'rename',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version.title).to eq('wiki_version_recorder_title_after')
-      expect(version.body).to eq('body')
-      expect(version.reason).to eq('rename')
-    end
-
-    it 'creates update version when body changes' do
-      page = create_page(title: 'wiki_version_recorder_body', body: 'before')
-      page.update!(body: 'after')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'body',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version.title).to eq('wiki_version_recorder_body')
-      expect(version.body).to eq('after')
-      expect(version.reason).to eq('body')
-    end
-  end
-end