AI: address review on PR #465

backend/app/controllers/posts_controller.rb

@@ -37,7 +37,7 @@ class PostsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    history_join_required = order[0] == 'updated_at' || updated_between.any?(&:present?)
+    needs_history_join = order[0] == 'updated_at' || updated_between.any?(&:present?)
 
     q =
         filtered_posts(locale)
@@ -57,8 +57,8 @@ class PostsController < ApplicationController
     q = q.where('posts.created_at >= ?', created_between[0]) if created_between[0]
     q = q.where('posts.created_at <= ?', created_between[1]) if created_between[1]
     count_scope = q
-    if history_join_required
+    if needs_history_join
-      history_times = PostVersion.all
+      history_times = HistoryAccess.visible(PostVersion.all)
           .select('post_id, MAX(created_at) AS latest_at').group(:post_id)
       q = q.joins("LEFT JOIN (#{ history_times.to_sql }) history_times " +
                   'ON history_times.post_id = posts.id')
@@ -72,7 +72,7 @@ class PostsController < ApplicationController
       q = q.where("#{ updated_at_all_sql } <= ?", updated_between[1])
     end
     count_scope = q if updated_between.any?(&:present?)
-    if history_join_required
+    if needs_history_join
       q = q.select('posts.*', "#{ updated_at_all_sql } AS updated_at")
     end
 
@@ -92,10 +92,10 @@ class PostsController < ApplicationController
              .offset(offset)
              .to_a
     latest_version_times =
-        if history_join_required
+        if needs_history_join
           { }
         else
-          PostVersion.where(post_id: posts.map(&:id))
+          HistoryAccess.visible(PostVersion.where(post_id: posts.map(&:id)))
               .group(:post_id).maximum(:created_at)
         end
 

backend/app/controllers/tag_descriptions_controller.rb

@@ -49,6 +49,7 @@ class TagDescriptionsController < ApplicationController
   private
 
   def representation description
+    HistoryAccess.require_current!(description, TagDescriptionVersion)
     description.as_json(only: [
         :tag_id,
         :language_code,

backend/app/controllers/tag_groups_controller.rb

@@ -1,7 +1,7 @@
 class TagGroupsController < ApplicationController
   def index
     locale = resolve_locale!
-    groups = TagGroup.includes(:created_by_user, :updated_by_user).order(:id)
+    groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).includes(:created_by_user, :updated_by_user).order(:id)
     render json: TagGroupRepr.many(locale, groups.to_a)
   end
 

backend/app/controllers/wiki_pages_controller.rb

@@ -8,11 +8,12 @@ class WikiPagesController < ApplicationController
 
     title = params[:title].to_s.strip
     descriptions =
-        TagDescription.where(language_code: locale.language_code)
+        HistoryAccess.current(TagDescription.all, TagDescriptionVersion)
+        .where(language_code: locale.language_code)
         .includes(tag: :tag_names)
 
     descriptions = descriptions.order(updated_at: :desc, id: :asc)
-    tag_groups = TagGroup.order(updated_at: :desc, id: :asc)
+    tag_groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).order(updated_at: :desc, id: :asc)
     if title.present?
       pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
       descriptions =
@@ -40,13 +41,13 @@ class WikiPagesController < ApplicationController
     return head :not_found unless language.is_a?(String)
     return head :not_found unless Language.exists?(code: language)
 
-    names = TagDescription.joins(tag: :tag_names)
+    names = HistoryAccess.current(TagDescription.all, TagDescriptionVersion).joins(tag: :tag_names)
         .where(language_code: locale.language_code, tag_names: { language_code: language })
         .pluck('tag_descriptions.tag_id', 'tag_descriptions.id', 'tag_names.name')
     candidates = names.map do |tag_id, description_id, name|
       WikiPageRepr.autolink_tag(locale, tag_id:, description_id:, name:, language:)
     end
-    candidates.concat(TagGroup.order(:id).pluck(:id, :name).map do |id, name|
+    candidates.concat(HistoryAccess.current(TagGroup.all, TagGroupVersion).order(:id).pluck(:id, :name).map do |id, name|
       WikiPageRepr.autolink_group(locale, id:, name:, language:)
     end)
     render json: candidates
@@ -410,7 +411,7 @@ class WikiPagesController < ApplicationController
   end
 
   def tag_description_by_title locale, title
-    TagDescription.joins(tag: :tag_names)
+    HistoryAccess.current(TagDescription.all, TagDescriptionVersion).joins(tag: :tag_names)
         .find_by(language_code: locale.language_code,
                  tag_names: { language_code: locale.language_code, name: title })
   end

backend/app/models/history_access.rb

@@ -147,6 +147,29 @@ class HistoryAccess < ActiveSupport::CurrentAttributes
     scope.where(Arel.sql(sql(scope.klass, row)))
   end
 
+  def self.current(scope, version_model)
+    return scope if admin?
+
+    table = scope.klass.table_name
+    keys = KEYS.fetch(version_model.table_name)
+    matches = keys.map do |key|
+      column = scope.klass.column_names.include?(key) ? key : 'id'
+      "current_snapshot.#{ key } = #{ table }.#{ column }"
+    end.join(' AND ')
+    boundary = "#{ matches } AND current_snapshot.version_no >= #{ table }.version_no " +
+        "AND current_snapshot.event_type = 'discard'"
+    scope = scope.where(Arel.sql("NOT EXISTS (SELECT 1 FROM #{ version_model.table_name } " +
+        "current_snapshot WHERE #{ boundary })"))
+    condition = "#{ matches } AND current_snapshot.version_no = #{ table }.version_no"
+    scope.where(Arel.sql("NOT EXISTS (SELECT 1 FROM #{ version_model.table_name } " +
+        "current_snapshot WHERE #{ condition } AND NOT (#{ sql(version_model, 'current_snapshot') }))"))
+  end
+
+  def self.require_current!(record, version_model)
+    return if admin?
+    raise Forbidden unless current(record.class.where(id: record.id), version_model).exists?
+  end
+
   def self.blob_visible?(blob, seen = [])
     return true if admin?
     return false if seen.include?(blob.id)

backend/app/representations/tag_group_repr.rb

@@ -44,6 +44,7 @@ module TagGroupRepr
   end
 
   def one locale, group
+    HistoryAccess.require_current!(group, TagGroupVersion)
     many(locale, [group]).first
   end
 

backend/app/representations/wiki_page_repr.rb

@@ -5,6 +5,7 @@ module WikiPageRepr
   module_function
 
   def tag_description locale, description
+    HistoryAccess.require_current!(description, TagDescriptionVersion)
     tag = description.tag
 
     { 'id' => description.id,

backend/spec/requests/counts_history_boundaries_spec.rb

@@ -14,7 +14,7 @@ RSpec.describe 'History boundaries shared with Counts', type: :request do
     end
   end
 
-  it 'keeps discarded history private while exposing the current description' do
+  it 'denies the same discarded description through Counts, the facade and the ordinary API' do
     get '/counts/query', params: { resource: 'tag_descriptions', definition: 'history',
         mode: 'details', locale: 'ja', execution_at: '2025-01-01T00:00:00Z' }
     expect(response).to have_http_status(:ok)
@@ -22,8 +22,8 @@ RSpec.describe 'History boundaries shared with Counts', type: :request do
         'excluded_count' => 2, 'versions' => [])
     ["/wiki/#{ description.id }", "/tags/#{ tag.id }/description"].each do |path|
       get path, params: { locale: 'ja' }
-      expect(response).to have_http_status(:ok)
+      expect(response).to have_http_status(:not_found)
-      expect(response.parsed_body.fetch('body')).to eq(description.body)
+      expect(response.body).not_to include('private body')
     end
     get '/sitemap_entries/descriptions', params: { locale: 'ja' }
     expect(response).to have_http_status(:ok)

backend/spec/requests/post_history_privacy_spec.rb

@@ -69,38 +69,40 @@ RSpec.describe 'Post history privacy', type: :request do
         sign_in_as(create(:user, role.to_sym)) unless role == 'anonymous'
       end
 
-      it 'uses the latest version timestamp for display regardless of role' do
+      it 'uses only authorised history timestamps for display' do
         get '/posts'
         expect(response).to have_http_status(:ok)
         row = response.parsed_body.fetch('posts').find { _1.fetch('id') == post_record.id }
-        expected = origin + 4.days
+        expected = origin + (role == 'admin' ? 4 : 3).days
         expect(Time.zone.parse(row.fetch('updated_at'))).to eq(expected)
       end
 
-      it 'uses the latest version timestamp for date bounds and count regardless of role' do
+      it 'uses the same visibility for date bounds and count' do
         get '/posts', params: { updated_from: (origin + 4.days).iso8601,
                                 updated_to: (origin + 4.days).iso8601 }
         expect(response).to have_http_status(:ok)
         ids = response.parsed_body.fetch('posts').pluck('id')
-        expect(ids).to eq([post_record.id])
+        expect(ids).to eq(role == 'admin' ? [post_record.id] : [])
         expect(response.parsed_body.fetch('count')).to eq(ids.length)
       end
 
-      it 'sorts using the latest version timestamps in both directions regardless of role' do
+      it 'sorts using authorised timestamps in both directions' do
         ['asc', 'desc'].each do |direction|
           get '/posts', params: { order: "updated_at:#{ direction }" }
           expect(response).to have_http_status(:ok)
-          expected = [other_post.id, post_record.id]
+          expected = role == 'admin' ? [other_post.id, post_record.id] :
+              [post_record.id, other_post.id]
           expected.reverse! if direction == 'desc'
           expect(response.parsed_body.fetch('posts').pluck('id')).to eq(expected)
         end
       end
 
-      it 'applies latest version timestamp ordering before pagination regardless of role' do
+      it 'applies authorised timestamp ordering before pagination' do
         get '/posts', params: { order: 'updated_at:desc', limit: 1 }
 
         expect(response).to have_http_status(:ok)
-        expect(response.parsed_body.fetch('posts').pluck('id')).to eq([post_record.id])
+        expected = role == 'admin' ? post_record.id : other_post.id
+        expect(response.parsed_body.fetch('posts').pluck('id')).to eq([expected])
         expect(response.parsed_body.fetch('count')).to eq(2)
       end
 

frontend/src/components/PostEditForm.test.tsx

@@ -1,11 +1,13 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
+import { act, fireEvent, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { textContentOf } from '@/test/text'
 import PostEditForm from '@/components/PostEditForm'
 import { buildPost, buildTag } from '@/test/factories'
 import { renderWithProviders as render } from '@/test/render'
 
+import type { DialogueAPI } from '@/lib/dialogues/useDialogue'
+
 const postsApi = vi.hoisted (() => ({
   updatePost: vi.fn (),
 }))
@@ -18,18 +20,27 @@ const toastApi = vi.hoisted (() => ({
   toast: vi.fn (),
 }))
 
+const dialogue = vi.hoisted (() => ({
+    confirm: vi.fn<DialogueAPI['confirm']> (),
+    choice: vi.fn () }))
+
 vi.mock ('@/lib/posts', () => postsApi)
 vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
 vi.mock ('@/lib/dialogues/useDialogue', async importOriginal => ({
     ...await importOriginal<typeof import ('@/lib/dialogues/useDialogue')> (),
-  default: () => ({
+    default: () => dialogue }))
-    choice: vi.fn (),
-  }),
-}))
 
 describe ('PostEditForm', () => {
+  beforeEach (() => {
+    vi.resetAllMocks ()
+  })
+
   it ('submits edited post fields with the current base version', async () => {
+    const confirm = vi.fn<(value: boolean) => void> ()
+    dialogue.confirm.mockReturnValueOnce (new Promise<boolean> (resolve => {
+      confirm.mockImplementation (resolve)
+    }))
     const onSave = vi.fn ()
     const post = buildPost ({
       id:        8,
@@ -55,6 +66,16 @@ describe ('PostEditForm', () => {
     fireEvent.change (parentIds, { target: { value: '3 4' } })
     fireEvent.submit (screen.getByRole ('button', { name: '更新' }).closest ('form')!)
 
+    expect (postsApi.updatePost).not.toHaveBeenCalled ()
+    expect (dialogue.confirm).toHaveBeenCalledTimes (1)
+    const difference = textContentOf (
+	dialogue.confirm.mock.calls[0][0].description)
+    expect (difference).toContain ('oldnew')
+    expect (difference).toContain ('23 4')
+    expect (difference).not.toContain ('general-tag')
+
+    await act (async () => { confirm (true) })
+
     await waitFor (() => {
       expect (postsApi.updatePost).toHaveBeenCalledWith (
           expect.objectContaining ({
@@ -71,6 +92,28 @@ describe ('PostEditForm', () => {
     expect (textContentOf (toastApi.toast.mock.calls[0][0].description)).toBe ('更新しました．')
   })
 
+  it ('keeps edited fields without submitting when confirmation is cancelled', async () => {
+    const onSave = vi.fn ()
+    dialogue.confirm.mockResolvedValueOnce (false)
+    render (<PostEditForm post={buildPost ()} onSave={onSave}/>)
+
+    const [title, parentIds] = screen.getAllByRole ('textbox')
+    fireEvent.change (title, { target: { value: 'new' } })
+    fireEvent.change (parentIds, { target: { value: '3 4' } })
+    const button = screen.getByRole ('button', { name: '更新' })
+    fireEvent.submit (button.closest ('form')!)
+
+    await waitFor (() => {
+      expect (button).toBeEnabled ()
+    })
+    expect (dialogue.confirm).toHaveBeenCalledTimes (1)
+    expect (postsApi.updatePost).not.toHaveBeenCalled ()
+    expect (onSave).not.toHaveBeenCalled ()
+    expect (toastApi.toast).not.toHaveBeenCalled ()
+    expect (title).toHaveValue ('new')
+    expect (parentIds).toHaveValue ('3 4')
+  })
+
   it ('preserves duration while the video tag is temporarily removed', () => {
     const post = buildPost ({
       videoMs: 180_500,
@@ -100,6 +143,7 @@ describe ('PostEditForm', () => {
       'shows deduplicated original-created endpoint errors on the shared datetime field',
       async () => {
     const post = buildPost ()
+    dialogue.confirm.mockResolvedValueOnce (true)
     api.isApiError.mockReturnValue (true)
     postsApi.updatePost.mockRejectedValueOnce ({
       response: {

frontend/src/components/PostEditForm.tsx

@@ -15,7 +15,7 @@ import { msToTime } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 import { useUITranslation } from '@/lib/useUITranslation'
 
-import type { FC, FormEvent } from 'react'
+import type { FC, FormEvent, ReactNode } from 'react'
 
 import type { Post, TagWithSections } from '@/types'
 
@@ -23,6 +23,8 @@ type PostFormField =
     'parentPostIds' | 'tags' | 'videoMs'
     | 'originalCreatedAt' | 'originalCreatedFrom' | 'originalCreatedBefore'
 
+type PostEditData = Omit<Parameters<typeof updatePost>[0], 'id'>
+
 const groupedMessages = (...values: (string[] | undefined)[]): string[] =>
     [...new Set (values.flatMap (value => value ?? []))]
 
@@ -150,12 +152,63 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const handleSubmit = async (e: FormEvent) => {
     e.preventDefault ()
 
+    if (disabled) return
+
     setDisabled (true)
     try
     {
-      await update ({ id: post.id, title, tags, parentPostIds,
+      const current: PostEditData = {
+	  title, tags, parentPostIds,
 	  duration: videoFlg ? duration : null,
-		      originalCreatedFrom, originalCreatedBefore },
+	  originalCreatedFrom, originalCreatedBefore }
+      const fields: {
+	  [Key in keyof PostEditData]-?: {
+	      name: ReactNode
+	      prev: PostEditData[Key] } } = {
+	  title: { name: label ('shared:labels.title'), prev: post.title },
+	  parentPostIds: {
+	      name: label ('shared:labels.parentPosts'),
+	      prev: (post.parentPosts ?? []).map (parent => parent.id).join (' ') },
+	  tags: { name: label ('tags:title'), prev: tagsToStr (post.tags) },
+	  duration: {
+	      name: label ('shared:labels.duration'),
+	      prev: videoMsToDurationValue (post.videoMs) },
+	  originalCreatedFrom: {
+	      name: <>{label ('shared:labels.originalCreatedAt')}{' '}
+			{label ('shared:labels.since')}</>,
+	      prev: post.originalCreatedFrom },
+	  originalCreatedBefore: {
+	      name: <>{label ('shared:labels.originalCreatedAt')}{' '}
+			{label ('shared:labels.before')}</>,
+	      prev: post.originalCreatedBefore } }
+      const differences = (Object.keys (fields) as (keyof PostEditData)[])
+	  .map (key => ({ key, name: fields[key].name,
+	      prev: fields[key].prev ?? '', current: current[key] ?? '' }))
+	  .filter (row => row.prev !== row.current)
+
+      if (!(await dialogue.confirm ({
+	  title: label ('shared:actions.diff'),
+	  confirmText: label ('shared:actions.update'),
+	  description: (
+	      <dl className="max-h-[60dvh] overflow-y-auto space-y-3 text-left">
+		{differences.map (row => (
+		    <div key={row.key}>
+		      <dt className="font-semibold">{row.name}</dt>
+		      <dd className="whitespace-pre-wrap break-words">
+			{row.prev && (
+			    <del className="block text-red-600 dark:text-red-400">
+			      {row.prev}
+			    </del>)}
+			{row.current && (
+			    <ins className="block text-green-700 dark:text-green-400">
+			      {row.current}
+			    </ins>)}
+		      </dd>
+		    </div>))}
+	      </dl>) })))
+	return
+
+      await update ({ id: post.id, ...current },
 		    { baseVersionNo: post.versionNo })
     }
     finally