feat: タグ名を別管理に変更（#215） (#219)

Merge branch 'main' into feature/215

#215 ニコニコ同期テスト

#215 テスト・ケース追加

#215 テスト・ケース追加

#215 テスト・ケース追加

#215 テスト・ケース追加

Merge remote-tracking branch 'origin/main' into feature/215

Merge branch 'main' into feature/215

#215

#215

Merge remote-tracking branch 'origin/main' into feature/215

#215

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #219

backend/app/models/post_tag.rb

@@ -1,6 +1,10 @@
 class PostTag < ApplicationRecord
   include Discard::Model
 
+  before_destroy do
+    raise ActiveRecord::ReadOnlyRecord, '消さないでください．'
+  end
+
   belongs_to :post
   belongs_to :tag, counter_cache: :post_count
   belongs_to :created_user, class_name: 'User', optional: true

backend/app/models/tag.rb

@@ -21,6 +21,10 @@ class Tag < ApplicationRecord
                                        dependent: :destroy
   has_many :parents, through: :reversed_tag_implications, source: :parent_tag
 
+  belongs_to :tag_name
+  delegate :name, to: :tag_name, allow_nil: true
+  validates :tag_name, presence: true
+
   enum :category, { deerjikist:  'deerjikist',
                     meme:        'meme',
                     character:   'character',
@@ -29,7 +33,6 @@ class Tag < ApplicationRecord
                     nico:        'nico',
                     meta:        'meta' }
 
-  validates :name, presence: true, length: { maximum: 255 }
   validates :category, presence: true, inclusion: { in: Tag.categories.keys }
 
   validate :nico_tag_name_must_start_with_nico
@@ -44,31 +47,35 @@ class Tag < ApplicationRecord
       'mtr:'  => 'material',
       'meta:' => 'meta' }.freeze
 
+  def name= val
+    (self.tag_name ||= build_tag_name).name = val
+  end
+
+  def has_wiki
+    tag_name&.wiki_page.present?
+  end
+
   def self.tagme
-    @tagme ||= Tag.find_or_create_by!(name: 'タグ希望') do |tag|
-      tag.category = 'meta'
-    end
+    @tagme ||= find_or_create_by_tag_name!('タグ希望', category: 'meta')
   end
 
   def self.bot
-    @bot ||= Tag.find_or_create_by!(name: 'bot操作') do |tag|
-      tag.category = 'meta'
-    end
+    @bot ||= find_or_create_by_tag_name!('bot操作', category: 'meta')
   end
 
   def self.normalise_tags tag_names, with_tagme: true
     tags = tag_names.map do |name|
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.start_with?(p) } || ['', nil]
       name.delete_prefix!(pf)
-      Tag.find_or_initialize_by(name:).tap do |tag|
+      find_or_create_by_tag_name!(name, category: (cat || 'general')).tap do |tag|
         if cat && tag.category != cat
-          tag.category = cat
-          tag.save!
+          tag.update!(category: cat)
         end
       end
     end
+
     tags << Tag.tagme if with_tagme && tags.size < 10 && tags.none?(Tag.tagme)
-    tags.uniq
+    tags.uniq(&:id)
   end
 
   def self.expand_parent_tags tags
@@ -94,11 +101,19 @@ class Tag < ApplicationRecord
     (result + tags).uniq { |t| t.id }
   end
 
+  def self.find_or_create_by_tag_name!(name, category:)
+    tn = TagName.find_or_create_by!(name: name.to_s.strip)
+    Tag.find_or_create_by!(tag_name_id: tn.id) do |t|
+      t.category = category
+    end
+  end
+
   private
 
   def nico_tag_name_must_start_with_nico
-    if ((category == 'nico' && !(name.start_with?('nico:'))) || 
-        (category != 'nico' && name.start_with?('nico:')))
+    n = name.to_s
+    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/app/models/tag_name.rb

@@ -0,0 +1,9 @@
+class TagName < ApplicationRecord
+  has_one :tag
+  has_one :wiki_page
+
+  belongs_to :canonical, class_name: 'TagName', optional: true
+  has_many :aliases, class_name: 'TagName', foreign_key: :canonical_id
+
+  validates :name, presence: true, length: { maximum: 255 }, uniqueness: true
+end

backend/app/models/wiki_page.rb

@@ -11,7 +11,16 @@ class WikiPage < ApplicationRecord
            foreign_key: :redirect_page_id,
            dependent: :nullify
 
-  validates :title, presence: true, length: { maximum: 255 }, uniqueness: true
+  belongs_to :tag_name
+  validates :tag_name, presence: true
+
+  def title
+    tag_name.name
+  end
+
+  def title= val
+    (self.tag_name ||= build_tag_name).name = val
+  end
 
   def current_revision
     wiki_revisions.order(id: :desc).first