#302

backend/app/controllers/posts_controller.rb

@@ -44,7 +44,8 @@ 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(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+        .preload(:parents, :children,
+                 tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -95,8 +96,8 @@ class PostsController < ApplicationController
   end
 
   def random
-    post = filtered_posts
+    post = filtered_posts.preload(:parents, :childern,
-           .preload(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+                                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
                          .order('RAND()')
                          .first
     return head :not_found unless post
@@ -105,11 +106,15 @@ class PostsController < ApplicationController
   end
 
   def show
-    post = Post.includes(tags: [:deerjikists, :materials, { tag_name: :wiki_page }]).find_by(id: params[:id])
+    post = Post
+           .preload(:parents, :children)
+           .includes(:parents, :children,
+                     tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+           .find_by(id: params[:id])
     return head :not_found unless post
 
     render json: PostRepr.base(post, current_user)
-                         .merge(tags: build_tag_tree_for(post),
+                         .merge(tags: build_tag_tree_for(post.tags),
                                 related: PostRepr.many(post.related(limit: 20)))
   end
 
@@ -133,11 +138,11 @@ class PostsController < ApplicationController
     ApplicationRecord.transaction do
       post.save!
 
-      Tag.normalise_tags!(tag_names, with_sections: true) => { tags:, sections: }
+      tags = Tag.normalise_tags!(tag_names)
       TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)
 
       tags = Tag.expand_parent_tags(tags)
-      sync_post_tags!(post, tags, sections)
+      sync_post_tags!(post, tags)
 
       sync_parent_posts!(post, parent_post_ids)
 
@@ -236,7 +241,7 @@ class PostsController < ApplicationController
 
     post.reload
     json = PostRepr.base(post, current_user)
-    json['tags'] = build_tag_tree_for(post)
+    json['tags'] = build_tag_tree_for(post.tags)
     render json:, status: :ok
   rescue Tag::NicoTagNormalisationError
     head :bad_request
@@ -338,7 +343,7 @@ class PostsController < ApplicationController
   def tagged_post_ids_for(name) =
       Post.joins(tags: :tag_name).where(tag_names: { name: }).select(:id)
 
-  def sync_post_tags! post, desired_tags, sections
+  def sync_post_tags! post, desired_tags
     desired_tags.each do |t|
       t.save! if t.new_record?
     end
@@ -357,20 +362,13 @@ class PostsController < ApplicationController
       end
     end
 
-    PostTagSection.where(post_id: post.id).destroy_all
-    sections.each do |tag_id, ranges|
-      ranges.each do |begin_ms, end_ms|
-        PostTagSection.create!(post_id: post.id, tag_id:, begin_ms:, end_ms:)
-      end
-    end
-
     PostTag.where(post_id: post.id, tag_id: to_remove.to_a).kept.find_each do |pt|
       pt.discard_by!(current_user)
     end
   end
 
-  def build_tag_tree_for post
+  def build_tag_tree_for tags
-    tags = post.tags.to_a
+    tags = tags.to_a
     tag_ids = tags.map(&:id)
 
     implications = TagImplication.where(parent_tag_id: tag_ids, tag_id: tag_ids)
@@ -392,11 +390,8 @@ class PostsController < ApplicationController
       tag = tags_by_id[tag_id]
       return nil unless tag
 
-      sections = PostTagSection.where(post_id: post.id, tag_id:)
-                 .as_json(only: [:begin_ms, :end_ms])
-
       if path.include?(tag_id)
-        return TagRepr.base(tag).merge(children: [], sections:)
+        return TagRepr.base(tag).merge(children: [])
       end
 
       if memo.key?(tag_id)
@@ -408,7 +403,7 @@ class PostsController < ApplicationController
 
       children = child_ids.filter_map { |cid| build_node.(cid, new_path) }
 
-      memo[tag_id] = TagRepr.base(tag).merge(children:, sections:)
+      memo[tag_id] = TagRepr.base(tag).merge(children:)
     end
 
     root_ids.filter_map { |id| build_node.call(id, []) }
@@ -419,7 +414,7 @@ class PostsController < ApplicationController
 
     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) || id <= 0
+      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if id.nil? || id <= 0
 
       id
     }.uniq
@@ -481,21 +476,7 @@ class PostsController < ApplicationController
   end
 
   def editable_tag_names_from_post post
-    post
+    post.tags.not_nico.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-        .post_tags
-        .kept
-        .joins(tag: :tag_name)
-        .merge(Tag.not_nico)
-        .includes(:sections, tag: :tag_name)
-        .order('tag_names.name')
-        .map do |post_tag|
-      name = post_tag.tag.tag_name.name
-      sections = post_tag.sections.sort_by(&:begin_ms)
-
-      next name if sections.empty?
-
-      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
-    end
   end
 
   def post_incoming_snapshot title:, original_created_from:, original_created_before:,
@@ -527,16 +508,9 @@ class PostsController < ApplicationController
   end
 
   def incoming_tag_names_for_snapshot raw_tag_names
-    Tag.normalise_tags!(raw_tag_names, with_tagme: false, with_sections: true) =>
+    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false)
-        { tags:, sections: }
 
-    Tag.expand_parent_tags(tags).uniq(&:id).map { |tag|
+    Tag.expand_parent_tags(tags).map(&:name).uniq.sort
-      "#{ tag.name }#{ sections[tag.id].to_a.map { section_literal(_1) }.join }"
-    }.sort
-  end
-
-  def section_literal section
-    "[#{ Post.ms_to_time(section[0]) }-#{ Post.ms_to_time(section[1]) }]"
   end
 
   def post_conflict_json post:, base_version_no:, base_snapshot:,
@@ -623,8 +597,7 @@ class PostsController < ApplicationController
                  original_created_from: snapshot[:original_created_from],
                  original_created_before: snapshot[:original_created_before])
 
-    Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false, with_sections: true) =>
+    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false)
-        { tags: editable_tags, sections: }
     TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)
 
     readonly_tags = post.tags.nico.to_a
@@ -632,7 +605,7 @@ class PostsController < ApplicationController
     tags = readonly_tags + editable_tags
     tags = Tag.expand_parent_tags(tags)
 
-    sync_post_tags!(post, tags, sections)
+    sync_post_tags!(post, tags)
     sync_parent_posts!(post, snapshot[:parent_post_ids])
 
     PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)

backend/app/controllers/theatre_comments_controller.rb

@@ -1,14 +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.negative?
+    no_gt = 0 if no_gt < 0
 
     comments = TheatreComment
                .where(theatre_id: params[:theatre_id])
                .where('no > ?', no_gt)
                .order(no: :desc)
+               .limit(limit)
 
-    render json: comments.as_json(include: { user: { only: [:id, :name] } })
+    render json: comments.map {
+      _1.as_json(include: { user: { only: [:id, :name] } })
+          .merge(content: _1.discarded? ? nil : _1.content, deleted: _1.discarded?)
+    }
   end
 
   def create
@@ -29,4 +36,18 @@ 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
+
+    comment.discard!
+
+    head :no_content
+  end
 end

backend/app/controllers/theatre_programmes_controller.rb

@@ -0,0 +1,17 @@
+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)
+                 .order(position: :desc).limit(100)
+                 .limit(limit)
+
+    render json: programmes.as_json(include: { post: PostRepr::BASE })
+  end
+end

backend/app/controllers/theatres_controller.rb

@@ -43,11 +43,14 @@ class TheatresController < ApplicationController
     return head :not_found unless theatre
     return head :forbidden if theatre.host_user != current_user
 
+    ApplicationRecord.transaction do
       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)
+      position = (theatre.programmes.maximum(:position) || 0) + 1
+      theatre.programmes.create!(position:, post:)
+    end
 
     head :no_content
   end

backend/app/models/post.rb

@@ -56,38 +56,7 @@ class Post < ApplicationRecord
     super(options).merge(thumbnail: nil)
   end
 
-  def snapshot_tag_names
+  def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-    post_tags
-        .kept
-        .joins(tag: :tag_name)
-        .includes(:sections, tag: :tag_name)
-        .order('tag_names.name')
-        .map do |post_tag|
-      name = post_tag.tag.tag_name.name
-      sections = post_tag.sections.sort_by(&:begin_ms)
-
-      next name if sections.empty?
-
-      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
-    end
-  end
-
-  def self.section_literal section
-    "[#{ Post.ms_to_time(section.begin_ms) }-#{ Post.ms_to_time(section.end_ms) }]"
-  end
-
-  def self.ms_to_time ms
-    total_s = ms / 1_000
-    s = total_s % 60
-    min = (total_s / 60) % 60
-    h = total_s / 3_600
-
-    if h.positive?
-      '%d:%02d:%02d' % [h, min, s]
-    else
-      '%d:%02d' % [min, s]
-    end
-  end
 
   def snapshot_parent_post_ids = parents.order(:id).pluck(:id)
 

backend/app/models/post_tag.rb

@@ -10,12 +10,6 @@ class PostTag < ApplicationRecord
   belongs_to :created_user, class_name: 'User', optional: true
   belongs_to :deleted_user, class_name: 'User', optional: true
 
-  has_many :sections, -> { order(:begin_ms) }, class_name: 'PostTagSection',
-                                               foreign_key: [:post_id, :tag_id],
-                                               primary_key: [:post_id, :tag_id],
-                                               dependent: :delete_all,
-                                               inverse_of: :post_tag
-
   validates :post_id, presence: true
   validates :tag_id, presence: true
   validates :post_id, uniqueness: {

backend/app/models/post_tag_section.rb

@@ -1,20 +0,0 @@
-class PostTagSection < ApplicationRecord
-  self.primary_key = :post_id, :tag_id, :begin_ms
-
-  belongs_to :post
-  belongs_to :tag
-
-  belongs_to :post_tag, -> { kept }, foreign_key: [:post_id, :tag_id],
-                                     primary_key: [:post_id, :tag_id],
-                                     inverse_of: :sections,
-                                     optional: true
-
-  validates :post_id, presence: true
-  validates :tag_id, presence: true
-
-  validates :begin_ms, presence: true,
-                       numericality: { only_integer: true, greater_than_or_equal_to: 0 }
-
-  validates :end_ms, presence: true,
-                     numericality: { only_integer: true, greater_than: :begin_ms }
-end

backend/app/models/tag.rb

@@ -81,7 +81,7 @@ class Tag < ApplicationRecord
 
   def material_id = materials.first&.id
 
-  def has_deerjikists = deerjikists.present?
+  def has_deerjikists = deerjikists.exists?
 
   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)
@@ -92,50 +92,22 @@ class Tag < ApplicationRecord
 
   def self.normalise_tags! tag_names, with_tagme: true,
                                       with_no_deerjikist: true,
-                                      deny_nico: true,
+                                      deny_nico: true
-                                      with_sections: false
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
 
-    sections = { }
     tags = tag_names.map do |name|
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
-
+      name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
-      name = name.sub(/\A#{ pf }/i, '')
-
-      sections_by_tag = []
-      while n = name.sub!(/^(\S*?)\[([0-9:.]*?)-([0-9:.]*?)\](\S*?)$/, '\1\4 \2 \3')
-        name, *section_raw = n.split
-
-        begin_ms, end_ms = section_raw.map { time_to_ms(_1) }
-        next if begin_ms == end_ms
-
-        begin_ms, end_ms = end_ms, begin_ms if begin_ms > end_ms
-
-        sections_by_tag << [begin_ms, end_ms]
-      end
-
-      name = TagName.canonicalise(name).first
-
       find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
         tag.update!(category: cat) if cat && tag.category != cat
-        next if sections_by_tag.empty?
-
-        sections[tag.id] ||= []
-        sections[tag.id].concat(sections_by_tag)
       end
     end
 
     tags << Tag.tagme if with_tagme && tags.size < 10 && tags.none?(Tag.tagme)
     tags << Tag.no_deerjikist if with_no_deerjikist && tags.all? { |t| !(t.deerjikist?) }
-    tags.uniq!(&:id)
+    tags.uniq(&:id)
-
-    if with_sections
-      { tags:, sections: }
-    else
-      tags
-    end
   end
 
   def self.expand_parent_tags tags
@@ -256,23 +228,4 @@ class Tag < ApplicationRecord
       errors.add :category, 'ニジラーと紐づいてゐるタグはニジラー・カテゴリである必要があります．'
     end
   end
-
-  def self.time_to_ms str
-    parts = str.split(':')
-
-    s_part = parts.pop
-    s, ms = s_part.split('.')
-
-    total_s = s.to_i
-
-    if parts.length >= 1
-      total_s += parts.pop.to_i * 60
-    end
-
-    if parts.length >= 1
-      total_s += parts.pop.to_i * 3_600
-    end
-
-    total_s * 1_000 + ms.to_s.ljust(3, '0')[0, 3].to_i
-  end
 end

backend/app/models/theatre.rb

@@ -7,6 +7,8 @@ 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'
+
   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

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

backend/config/routes.rb

@@ -87,7 +87,8 @@ Rails.application.routes.draw do
       patch :next_post
     end
 
-    resources :comments, controller: :theatre_comments, only: [:index, :create]
+    resources :comments, controller: :theatre_comments, only: [:index, :create, :destroy]
+    resources :programmes, controller: :theatre_programmes, only: [:index]
   end
 
   resources :materials, only: [:index, :show, :create, :update, :destroy]

backend/db/migrate/20260514221900_create_theatre_programmes.rb

@@ -0,0 +1,10 @@
+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/20260518235300_create_post_tag_sections.rb

@@ -1,19 +0,0 @@
-class CreatePostTagSections < ActiveRecord::Migration[8.0]
-  def change
-    create_table :post_tag_sections, primary_key: [:post_id, :tag_id, :begin_ms] do |t|
-      t.references :post, null: false, foreign_key: true, index: false
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :begin_ms, null: false
-      t.integer :end_ms, null: false
-      t.timestamps
-
-      t.index [:post_id, :begin_ms], name: 'idx_post_tag_sections_post_id_begin_ms'
-
-      t.check_constraint 'begin_ms >= 0',
-                         name: 'chk_post_tag_sections_begin_ms_natural'
-
-      t.check_constraint 'begin_ms < end_ms',
-                         name: 'chk_post_tag_sections_end_ms_after_begin_ms'
-    end
-  end
-end

backend/db/migrate/20260519013100_add_video_ms_to_posts.rb

@@ -1,9 +0,0 @@
-class AddVideoMsToPosts < ActiveRecord::Migration[8.0]
-  def change
-    add_column :posts, :video_ms, :integer
-    add_index :posts, [:video_ms, :id], name: 'idx_posts_video_ms_id'
-
-    add_check_constraint :posts, 'video_ms IS NULL OR video_ms > 0',
-                         name: 'chk_posts_video_ms_positive'
-  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_05_19_013100) do
+ActiveRecord::Schema[8.0].define(version: 2026_05_14_221900) 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
@@ -137,19 +137,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) do
     t.index ["target_post_id"], name: "index_post_similarities_on_target_post_id"
   end
 
-  create_table "post_tag_sections", primary_key: ["post_id", "tag_id", "begin_ms"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "post_id", null: false
-    t.bigint "tag_id", null: false
-    t.integer "begin_ms", null: false
-    t.integer "end_ms", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["post_id", "begin_ms"], name: "idx_post_tag_sections_post_id_begin_ms"
-    t.index ["tag_id"], name: "fk_rails_8be3847903"
-    t.check_constraint "`begin_ms` < `end_ms`", name: "chk_post_tag_sections_end_ms_after_begin_ms"
-    t.check_constraint "`begin_ms` >= 0", name: "chk_post_tag_sections_begin_ms_natural"
-  end
-
   create_table "post_tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.bigint "tag_id", null: false
@@ -200,11 +187,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) do
     t.datetime "original_created_before"
     t.datetime "updated_at", null: false
     t.integer "version_no", null: false
-    t.integer "video_ms"
     t.index ["uploaded_user_id"], name: "index_posts_on_uploaded_user_id"
     t.index ["url"], name: "index_posts_on_url", unique: true
-    t.index ["video_ms", "id"], name: "idx_posts_video_ms_id"
-    t.check_constraint "(`video_ms` is null) or (`video_ms` > 0)", name: "chk_posts_video_ms_positive"
     t.check_constraint "`version_no` > 0", name: "chk_posts_version_no_positive"
   end
 
@@ -299,6 +283,15 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) 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_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
@@ -463,8 +456,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) do
   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_tag_sections", "posts"
-  add_foreign_key "post_tag_sections", "tags"
   add_foreign_key "post_tags", "posts"
   add_foreign_key "post_tags", "tags"
   add_foreign_key "post_tags", "users", column: "created_user_id"
@@ -483,6 +474,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) do
   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_watching_users", "theatres"
   add_foreign_key "theatre_watching_users", "users"
   add_foreign_key "theatres", "posts", column: "current_post_id"

backend/spec/factories/post_tag_sections.rb

@@ -1,8 +0,0 @@
-FactoryBot.define do
-  factory :post_tag_section do
-    association :post
-    association :tag
-    begin_ms { 1_000 }
-    end_ms { 2_000 }
-  end
-end

backend/spec/factories/post_tags.rb

@@ -1,6 +0,0 @@
-FactoryBot.define do
-  factory :post_tag do
-    association :post
-    association :tag
-  end
-end

backend/spec/factories/posts.rb

@@ -1,8 +0,0 @@
-FactoryBot.define do
-  factory :post do
-    sequence(:url) { |n| "https://example.com/factory-post-#{ n }" }
-    title { 'factory post' }
-    thumbnail_base { nil }
-    uploaded_user { nil }
-  end
-end

backend/spec/models/post_tag_spec.rb

@@ -1,29 +0,0 @@
-RSpec.describe PostTag, type: :model do
-  describe '#sections' do
-    it 'loads sections by post_id and tag_id' do
-      post_tag = create(:post_tag)
-      section = create(:post_tag_section,
-                       post: post_tag.post,
-                       tag: post_tag.tag,
-                       begin_ms: 1000,
-                       end_ms: 2000)
-
-      expect(post_tag.sections).to contain_exactly(section)
-    end
-
-    it 'does not load sections for another tag on the same post' do
-      post = create(:post)
-      tag = create(:tag)
-      other_tag = create(:tag)
-
-      post_tag = create(:post_tag, post:, tag:)
-      create(:post_tag_section,
-             post:,
-             tag: other_tag,
-             begin_ms: 1000,
-             end_ms: 2000)
-
-      expect(post_tag.sections).to be_empty
-    end
-  end
-end

frontend/src/App.tsx

@@ -63,7 +63,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/tags/:id/deerjikists" element={<DeerjikistDetailPage/>}/>
 	  <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	  <Route path="/tags/changes" element={<TagHistoryPage/>}/>
-	  <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
+	  <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
 	  <Route path="/materials" element={<MaterialBasePage/>}>
 	    <Route index element={<MaterialListPage/>}/>
 	    <Route path="new" element={<MaterialNewPage/>}/>

frontend/src/components/PostEditForm.tsx

@@ -8,28 +8,24 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { isApiError } from '@/lib/api'
 import { updatePost } from '@/lib/posts'
-import { msToTime } from '@/lib/utils'
 
 import type { FC, FormEvent } from 'react'
 
-import type { Post, TagWithSections } from '@/types'
+import type { Post, Tag } from '@/types'
 
 
-const tagsToStr = (tags: TagWithSections[]): string => {
+const tagsToStr = (tags: Tag[]): string => {
-  const result: Omit<TagWithSections, 'children'>[] = []
+  const result: Tag[] = []
 
-  const walk = (tag: TagWithSections) => {
+  const walk = (tag: Tag) => {
     const { children, ...rest } = tag
     result.push (rest)
-    children.forEach (walk)
+    children?.forEach (walk)
   }
 
   tags.filter (t => t.category !== 'nico').forEach (walk)
 
-  return [...(new Set (result.map (t =>
+  return [...(new Set (result.map (t => t.name)))].join (' ')
-      `${ t.name }${ t.sections
-		     .map (s => `[${ msToTime (s.beginMs) }-${ msToTime (s.endMs) }]`)
-		     .join ('') }`)))].join (' ')
 }
 
 
@@ -121,7 +117,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   }
 
   useEffect (() => {
-    setTags (tagsToStr (post.tags))
+    setTags(tagsToStr (post.tags))
   }, [post])
 
   return (

frontend/src/components/TagDetailSidebar.tsx

@@ -26,13 +26,13 @@ import { dateString, originalCreatedAtString } from '@/lib/utils'
 import type { DragEndEvent } from '@dnd-kit/core'
 import type { FC, MutableRefObject, ReactNode } from 'react'
 
-import type { Category, Post, TagWithSections } from '@/types'
+import type { Category, Post, Tag } from '@/types'
 
-type TagByCategory = { [key in Category]: TagWithSections[] }
+type TagByCategory = { [key in Category]: Tag[] }
 
 
 const renderTagTree = (
-    tag:              TagWithSections,
+    tag:              Tag,
     nestLevel:        number,
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
@@ -63,7 +63,7 @@ const renderTagTree = (
 
 
 const isDescendant = (
-    root:     TagWithSections,
+    root:     Tag,
     targetId: number,
 ): boolean => {
   if (!(root.children))
@@ -84,8 +84,8 @@ const isDescendant = (
 const findTag = (
     byCat:  TagByCategory,
     id:     number,
-): TagWithSections | undefined => {
+): Tag | undefined => {
-  const walk = (nodes: TagWithSections[]): TagWithSections | undefined => {
+  const walk = (nodes: Tag[]): Tag | undefined => {
     for (const t of nodes)
       {
 	if (t.id === id)
@@ -167,7 +167,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
       }
 
     for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
-      tagsTmp[cat].sort ((tagA: TagWithSections, tagB: TagWithSections) => tagA.name < tagB.name ? -1 : 1)
+      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
 
     return tagsTmp
   }, [post])

frontend/src/components/TopNav.tsx

@@ -55,12 +55,6 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	  { name: '追加', to: '/materials/new' },
 	  { name: '全体履歴', to: '/materials/changes', visible: false },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材集' }] },
-      { name: '上映会', to: '/theatres/1', base: '/theatres', subMenu: [
-	  { name: <>第&thinsp;1&thinsp;会場</>, to: '/theatres/1' },
-	  { name: 'CyTube', to: '//cytube.mm428.net/r/deernijika' },
-	  { name: <>ニジカ放送局第&thinsp;1&thinsp;チャンネル</>,
-	    to: '//www.youtube.com/watch?v=DCU3hL4Uu6A' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:上映会' }] },
       { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
 	  { name: '検索', to: '/wiki' },
 	  { name: '新規', to: '/wiki/new' },
@@ -71,6 +65,8 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	    visible: wikiPageFlg },
 	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
 	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`, visible: wikiPageFlg }] },
+      { name: 'おたのしみ', visible: false, subMenu: [
+	  { name: '上映会 (β)', to: '/theatres/1' }] },
       { name: 'ユーザ', to: '/users/settings', visible: false, subMenu: [
 	  { name: '一覧', to: '/users', visible: false },
 	  { name: 'お前', to: `/users/${ user?.id }`, visible: false },
@@ -267,7 +263,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			       : { initial: { x: 40, y: -40, opacity: 0 },
 				   animate: { x: 0, y: 0, opacity: 1 },
 				   exit: { x: 40, y: -40, opacity: 0 } })}
-			  className="z-10 h-full flex items-center px-3 font-bold w-24">
+			  className="z-10 h-full flex items-center px-3 font-bold w-28">
 			<h2>{item.name}</h2>
 		      </motion.div>
 		      {item.subMenu

frontend/src/lib/utils.ts

@@ -71,15 +71,3 @@ export const originalCreatedAtString = (
 	       .join (' '))
   return rtn === '〜' ? '年月日不詳' : rtn
 }
-
-
-export const msToTime = (ms: number): string => {
-  const totalS = Math.trunc (ms / 1_000)
-  const s = String (totalS % 60)
-  const min = String (Math.trunc (totalS / 60) % 60)
-  const h = Math.trunc (totalS / 3_600)
-
-  return (h > 0
-	  ? `${ h }:${ min.padStart (2, '0') }:${ s.padStart (2, '0') }`
-	  : `${ min }:${ s.padStart (2, '0') }`)
-}

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -1,6 +1,5 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { useEffect, useMemo, useState } from 'react'
-import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
@@ -70,11 +69,6 @@ const DeerjikistDetailPage: FC = () => {
 
   return (
       <MainArea>
-	<Helmet>
-	  <meta name="robots" content="noindex"/>
-	  {tag && <title>{tag.name} | ニジラー情報</title>}
-	</Helmet>
-
 	{(loading || !(tag)) ? 'Loading...' : (
 	    <div className="max-w-xl">
 	      <PageTitle>

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -6,20 +6,24 @@ import ErrorScreen from '@/components/ErrorScreen'
 import PostEmbed from '@/components/PostEmbed'
 import PrefetchLink from '@/components/PrefetchLink'
 import TagDetailSidebar from '@/components/TagDetailSidebar'
+import SectionTitle from '@/components/common/SectionTitle'
+import { useDialogue } from '@/components/dialogues/DialogueProvider'
+import { Button } from '@/components/ui/button'
 import MainArea from '@/components/layout/MainArea'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { SITE_TITLE } from '@/config'
-import { apiGet, apiPatch, apiPost, apiPut, isApiError } from '@/lib/api'
+import { apiGet, apiDelete, apiPatch, apiPost, apiPut, isApiError } from '@/lib/api'
 import { fetchPost } from '@/lib/posts'
 import { dateString } from '@/lib/utils'
 
-import type { FC } from 'react'
+import type { FC, User } from 'react'
 
 import type { NiconicoMetadata,
 	      NiconicoViewerHandle,
 	      Post,
 	      Theatre,
-	      TheatreComment } from '@/types'
+	      TheatreComment,
+	      TheatreProgramme } from '@/types'
 
 type TheatreInfo = {
     hostFlg:        boolean
@@ -34,9 +38,36 @@ const INITIAL_THEATRE_INFO =
       watchingUsers: [] as { id: number; name: string }[] } as const
 
 
-const TheatreDetailPage: FC = () => {
+const commentBox: ReactNode[] = (comment: TheatreComment) =>
+    [(
+	<div key={`${ comment.no }-content`} className="w-full">
+	  {comment.deleted
+	   ? (
+	      <span className="text-sm font-bold">
+		削除されました．
+	      </span>)
+	   : comment.content}
+	</div>),
+     (
+	<div key={`${ comment.no }-user`} className="w-full text-sm text-right">
+	  by {comment.user
+	      ? (comment.user.name || `名もなきニジラー（#${ comment.user.id }）`)
+	      : '運営'}
+	</div>),
+     (
+	<div key={`${ comment.no }-createdAt`} className="w-full text-sm text-right">
+	  {dateString (comment.createdAt)}
+	</div>)]
+
+
+type Props = { user: User }
+
+
+const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
   const { id } = useParams ()
 
+  const dialogue = useDialogue ()
+
   const commentsRef = useRef<HTMLDivElement> (null)
   const embedRef = useRef<NiconicoViewerHandle> (null)
   const loadingRef = useRef (false)
@@ -52,6 +83,7 @@ const TheatreDetailPage: FC = () => {
   const [theatre, setTheatre] = useState<Theatre | null> (null)
   const [theatreInfo, setTheatreInfo] = useState<TheatreInfo> (INITIAL_THEATRE_INFO)
   const [post, setPost] = useState<Post | null> (null)
+  const [programmes, setProgrammes] = useState<TheatreProgramme[]> ([])
   const [videoLength, setVideoLength] = useState (0)
 
   useEffect (() => {
@@ -118,7 +150,7 @@ const TheatreDetailPage: FC = () => {
       {
 	const newComments = await apiGet<TheatreComment[]> (
 	    `/theatres/${ id }/comments`,
-	    { params: { no_gt: lastCommentNoRef.current } })
+	    { params: { no_gt: lastCommentNoRef.current, limit: '20' } })
 
 	if (!(cancelled) && newComments.length > 0)
 	  {
@@ -214,10 +246,24 @@ const TheatreDetailPage: FC = () => {
       }
     }) ()
 
+    void (async () => {
+      try
+      {
+	const data = await apiGet<TheatreProgramme[]> (
+	    `/theatres/${ id }/programmes`, { params: { limit: '100' } })
+	if (!(cancelled))
+	  setProgrammes (data)
+      }
+      catch (e)
+      {
+	console.error (e)
+      }
+    }) ()
+
     return () => {
       cancelled = true
     }
-  }, [theatreInfo.postId])
+  }, [id, theatreInfo.postId])
 
   const syncPlayback = (meta: NiconicoMetadata) => {
     if (!(theatreInfo.postStartedAt))
@@ -233,12 +279,30 @@ const TheatreDetailPage: FC = () => {
       embedRef.current?.seek (targetTime)
   }
 
+  const handleDelete = async (commentNo: number) => {
+    try
+    {
+      await apiDelete (`/theatres/${ id }/comments/${ commentNo }`)
+      setComments (prev => {
+	const rtn = [...prev]
+	const idx = rtn.findIndex (x => x.no === commentNo)
+	rtn[idx] = { ...rtn[idx], deleted: true }
+	return rtn
+      })
+    }
+    catch
+    {
+      ;
+    }
+  }
+
   if (status >= 400)
     return <ErrorScreen status={status}/>
 
   return (
       <div className="md:flex md:flex-1 overflow-y-auto md:overflow-y-hidden">
 	<Helmet>
+	  <meta name="robots" content="noindex"/>
 	  {theatre && (
 	      <title>
 		{'上映会場'
@@ -270,6 +334,22 @@ const TheatreDetailPage: FC = () => {
 		  </PrefetchLink>
 		</div>
 	      </>) : 'Loading...'}
+
+	  <div>
+	    <SectionTitle>
+	      上映履歴
+	    </SectionTitle>
+
+	    <div>
+	      {programmes.map ((programme, i) => (
+		  <div key={i}>
+		    <PrefetchLink to={`/posts/${ programme.post.id }`}>
+		      {programme.post.title}
+		    </PrefetchLink>
+		    （{dateString (programme.createdAt)}）
+		  </div>))}
+	    </div>
+	  </div>
 	</MainArea>
 
 	<SidebarComponent>
@@ -306,18 +386,36 @@ const TheatreDetailPage: FC = () => {
 		className="overflow-x-hidden overflow-y-scroll text-wrap w-full
 			   h-[32vh] md:h-[64vh] border rounded">
 	      {comments.map (comment => (
-		  <div key={comment.no} className="p-2">
+		  <div
-		    <div className="w-full">
+		      key={comment.no}
-		      {comment.content}
+		      className="p-2 group relative rounded py-1 hover:bg-gray-100
-		    </div>
+				 dark:hover:bg-gray-800">
-		    <div className="w-full text-sm text-right">
+		    {(user && comment.user?.id === user.id && !(comment.deleted)) && (
-		      by {comment.user
+			<button
-			  ? (comment.user.name || `名もなきニジラー（#${ comment.user.id }）`)
+			    type="button"
-			  : '運営'}
+			    className="absolute left-1 top-1 hidden rounded text-md text-red-600
-		    </div>
+				       hover:bg-red-100 group-hover:inline-block
-		    <div className="w-full text-sm text-right">
+				       dark:text-red-300 dark:hover:bg-red-950"
-		      {dateString (comment.createdAt)}
+			    aria-label="コメントを削除"
-		    </div>
+			    onClick={async e => {
+			      e.stopPropagation ()
+
+			      if (!(await dialogue.confirm ({
+				  title: 'このコメントを削除しますか?',
+				  description: (
+				      <div className="border border-black dark:border-white rounded
+						      my-3 p-2 w-64">
+					{commentBox (comment)}
+				      </div>),
+				  confirmText: '削除',
+				  variant: 'danger' })))
+				return
+
+			      await handleDelete (comment.no)
+			    }}>
+			  &times;
+			</button>)}
+		    {commentBox (comment)}
 		  </div>))}
 	    </div>
 	  </form>
@@ -345,4 +443,5 @@ const TheatreDetailPage: FC = () => {
       </div>)
 }
 
+
 export default TheatreDetailPage

frontend/src/test/factories.ts

@@ -1,6 +1,6 @@
-import type { Material, Post, TagWithSections, User, WikiPage } from '@/types'
+import type { Material, Post, Tag, User, WikiPage } from '@/types'
 
-export const buildTag = (overrides: Partial<TagWithSections> = {}): TagWithSections => ({
+export const buildTag = (overrides: Partial<Tag> = {}): Tag => ({
   id:             1,
   name:           'テストタグ',
   category:       'general',
@@ -13,8 +13,6 @@ export const buildTag = (overrides: Partial<TagWithSections> = {}): TagWithSecti
   materialId:     null,
   hasDeerjikists: false,
   matchedAlias:   null,
-  sections:       [],
-  children:       [],
   ...overrides,
 })
 

frontend/src/types.ts

@@ -126,7 +126,7 @@ export type Post = {
     title:                  string | null
     thumbnail:              string | null
     thumbnailBase:          string | null
-    tags:                   TagWithSections[]
+    tags:                   Tag[]
     parentPosts?:           Post[]
     childPosts?:            Post[]
     siblingPosts?:          Record<`${ number }`, Post[]>
@@ -187,6 +187,7 @@ export type Tag = {
     hasWiki:        boolean
     materialId:     number | null
     hasDeerjikists: boolean
+    children?:      Tag[]
     matchedAlias?:  string | null }
 
 export type TagVersion = {
@@ -200,10 +201,6 @@ export type TagVersion = {
     createdAt:              string
     createdByUser:          { id: number; name: string | null } | null }
 
-export type TagWithSections = Tag & { sections: { beginMs:  number
-						  endMs:    number }[]
-			              children: TagWithSections[] }
-
 export type Theatre = {
     id:             number
     name:           string | null
@@ -213,12 +210,25 @@ export type Theatre = {
     createdAt:      string
     updatedAt:      string }
 
-export type TheatreComment = {
+export type TheatreComment =
-    theatreId:  number,
+    | { theatreId:  number
-    no:         number,
+	no:         number
+	deteled:    false
 	user:       { id: number, name: string } | null
 	content:    string
 	createdAt:  string }
+    | { theatreId:  number
+	no:         number
+	deleted:    true
+	user:       { id: number, name: string } | null
+	content     null,
+	createdAt:  string }
+
+export type TheatreProgramme = {
+    theatreId:  number
+    position:   number
+    post:       Post
+    createdAt:  string }
 
 export type User = {
     id:               number