#215

backend/app/controllers/nico_tags_controller.rb

@@ -1,9 +1,13 @@
 class NicoTagsController < ApplicationController
+  TAG_JSON = { only: [:id, :category, :post_count], methods: [:name, :has_wiki] }.freeze
+
   def index
     limit = (params[:limit] || 20).to_i
     cursor = params[:cursor].presence
 
-    q = Tag.nico_tags.includes(:linked_tags).order(updated_at: :desc)
+    q = Tag.nico_tags
+           .includes(:tag_name, linked_tags: :tag_name)
+           .order(updated_at: :desc)
     q = q.where('tags.updated_at < ?', Time.iso8601(cursor)) if cursor
 
     tags = q.limit(limit + 1)
@@ -15,7 +19,9 @@ class NicoTagsController < ApplicationController
     end
 
     render json: { tags: tags.map { |tag|
-      tag.as_json(include: :linked_tags)
+      tag.as_json(TAG_JSON).merge(linked_tags: tag.linked_tags.map { |lt|
+        lt.as_json(TAG_JSON)
+      })
     }, next_cursor: }
   end
 
@@ -30,12 +36,11 @@ class NicoTagsController < ApplicationController
 
     linked_tag_names = params[:tags].to_s.split(' ')
     linked_tags = Tag.normalise_tags(linked_tag_names, with_tagme: false)
-    return head :bad_request if linked_tags.filter { |t| t.category == 'nico' }.present?
+    return head :bad_request if linked_tags.any? { |t| t.category == 'nico' }
 
     tag.linked_tags = linked_tags
-    tag.updated_at = Time.now
     tag.save!
 
-    render json: tag.linked_tags, status: :ok
+    render json: tag.linked_tags.map { |t| t.as_json(TAG_JSON) }, status: :ok
   end
 end

backend/app/controllers/posts_controller.rb

@@ -158,7 +158,7 @@ class PostsController < ApplicationController
     pts.each do |pt|
       events << Event.new(
           post:         pt.post,
-          tag:          pt.tag,
+          tag:          pt.tag.as_json(only: [:id, :category], methods: [:name]),
           user:         pt.created_user && { id: pt.created_user.id, name: pt.created_user.name },
           change_type:  'add',
           timestamp:    pt.created_at)
@@ -166,7 +166,7 @@ class PostsController < ApplicationController
       if pt.discarded_at
         events << Event.new(
             post:         pt.post,
-            tag:          pt.tag,
+            tag:          pt.tag.as_json(only: [:id, :category], methods: [:name]),
             user:         pt.deleted_user && { id: pt.deleted_user.id, name: pt.deleted_user.name },
             change_type:  'remove',
             timestamp:    pt.discarded_at)

backend/app/controllers/tags_controller.rb

@@ -9,7 +9,7 @@ class TagsController < ApplicationController
           Tag.all
         end
 
-    render json: tags.includes(:tag_name)
+    render json: tags.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
   end
 
   def autocomplete
@@ -21,12 +21,12 @@ class TagsController < ApplicationController
                    'nico', "nico:#{ q }%", "#{ q }%")
             .order(Arel.sql('post_count DESC, tag_names.name ASC'))
             .limit(20))
-    render json: tags
+    render json: tags.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
   end
 
   def show
     tag = Tag.find_by(id: params[:id])
-    render json: tag
+    render json: tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
   end
 
   def show_by_name
@@ -35,7 +35,7 @@ class TagsController < ApplicationController
 
     tag = Tag.joins(:tag_name).includes(:tag_name).find_by(tag_names: { name: })
     if tag
-      render json: tag
+      render json: tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
     else
       head :not_found
     end

backend/app/controllers/wiki_pages_controller.rb

@@ -2,11 +2,13 @@ class WikiPagesController < ApplicationController
   rescue_from Wiki::Commit::Conflict, with: :render_wiki_conflict
 
   def index
-    render json: WikiPage.all
+    pages = WikiPage.all
+    render json: pages.as_json(methods: [:title])
   end
 
   def show
-    render_wiki_page_or_404 WikiPage.includes(:tag_name).find_by(id: params[:id])
+    page = WikiPage.find_by(id: params[:id])
+    render_wiki_page_or_404 page
   end
 
   def show_by_title
@@ -86,7 +88,7 @@ class WikiPagesController < ApplicationController
       message = params[:message].presence
       Wiki::Commit.content!(page:, body:, created_user: current_user, message:)
 
-      render json: page, status: :created
+      render json: page.as_json(methods: [:title]), status: :created
     else
       render json: { errors: page.errors.full_messages },
              status: :unprocessable_entity
@@ -127,7 +129,7 @@ class WikiPagesController < ApplicationController
       q = q.where('tag_names.name LIKE ?', "%#{ WikiPage.sanitize_sql_like(title) }%")
     end
 
-    render json: q.limit(20)
+    render json: q.limit(20).as_json(methods: [:title])
   end
 
   def changes
@@ -167,12 +169,14 @@ class WikiPagesController < ApplicationController
       pred = page.pred_revision_id(revision_id)
       succ = page.succ_revision_id(revision_id)
 
-      return render json: page.as_json.merge(body:, revision_id:, pred:, succ:)
+      return render json: page.as_json(methods: [:title])
+                              .merge(body:, revision_id:, pred:, succ:)
     end
 
     rev = page.current_revision
     unless rev
-      return render json: page.as_json.merge(body: nil, revision_id: nil, pred: nil, succ: nil)
+      return render json: page.as_json(methods: [:title])
+                              .merge(body: nil, revision_id: nil, pred: nil, succ: nil)
     end
 
     if rev.redirect?
@@ -186,7 +190,7 @@ class WikiPagesController < ApplicationController
     pred = page.pred_revision_id(revision_id)
     succ = page.succ_revision_id(revision_id)
 
-    render json: page.as_json.merge(body:, revision_id:, pred:, succ:)
+    render json: page.as_json(methods: [:title]).merge(body:, revision_id:, pred:, succ:)
   end
 
   def render_wiki_conflict err

backend/app/models/tag.rb

@@ -22,7 +22,7 @@ class Tag < ApplicationRecord
   has_many :parents, through: :reversed_tag_implications, source: :parent_tag
 
   belongs_to :tag_name
-  delegate :name, to: :tag_name
+  delegate :name, to: :tag_name, allow_nil: true
   validates :tag_name, presence: true
 
   enum :category, { deerjikist:  'deerjikist',
@@ -51,6 +51,10 @@ class Tag < ApplicationRecord
     (self.tag_name ||= build_tag_name).name = val
   end
 
+  def has_wiki
+    tag_name&.wiki_page.present?
+  end
+
   def self.tagme
     @tagme ||= find_or_create_by_tag_name!('タグ希望', category: 'meta')
   end
@@ -107,8 +111,9 @@ class Tag < ApplicationRecord
   private
 
   def nico_tag_name_must_start_with_nico
-    if ((category == 'nico' && !(name.start_with?('nico:'))) || 
+    n = name.to_s
-        (category != 'nico' && name.start_with?('nico:')))
+    if ((category == 'nico' && !(n.start_with?('nico:'))) || 
+        (category != 'nico' && n.start_with?('nico:')))
       errors.add :name, 'ニコニコ・タグの命名規則に反してゐます．'
     end
   end

backend/db/migrate/20260112111800_drop_tag_aliases.rb

@@ -0,0 +1,9 @@
+class DropTagAliases < ActiveRecord::Migration[7.0]
+  def up
+    drop_table :tag_aliases
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration, '戻せません．'
+  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_01_11_204400) do
+ActiveRecord::Schema[8.0].define(version: 2026_01_12_111800) 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
@@ -106,14 +106,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_01_11_204400) do
     t.index ["user_id"], name: "index_settings_on_user_id"
   end
 
-  create_table "tag_aliases", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.string "name", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["tag_id"], name: "index_tag_aliases_on_tag_id"
-  end
-
   create_table "tag_implications", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "tag_id", null: false
     t.bigint "parent_tag_id", null: false
@@ -239,7 +231,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_01_11_204400) do
   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_aliases", "tags"
   add_foreign_key "tag_implications", "tags"
   add_foreign_key "tag_implications", "tags", column: "parent_tag_id"
   add_foreign_key "tag_names", "tag_names", column: "canonical_id"