#431

backend/app/controllers/tags_controller.rb

@@ -802,7 +802,8 @@ class TagsController < ApplicationController
       affected_tags << alias_tag_name&.tag
     end
 
-    affected_tags.compact.uniq.each do |affected_tag|
+    affected_tags = affected_tags.compact.uniq(&:id)
+    affected_tags.each do |affected_tag|
       TagVersioning.ensure_snapshot!(affected_tag, created_by_user: current_user,
                                      language_code: locale.language_code)
     end
@@ -821,7 +822,10 @@ class TagsController < ApplicationController
       alias_tag_name.update!(tag:, primary_flg: false, auto_generated: false)
     end
 
-    affected_tags.compact.uniq.each do |affected_tag|
+    affected_tags.each do |affected_tag|
+      # update_all records this Tag after its parent relationships are updated.
+      next if affected_tag.id == tag.id
+
       record_tag_version!(affected_tag, event_type: :update,
                           created_by_user: current_user,
                           language_code: locale.language_code)

backend/app/controllers/wiki_pages_controller.rb

@@ -135,10 +135,10 @@ class WikiPagesController < ApplicationController
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group: nil)
       group = TagGroupOperation.create!(
-          name:, **parsed.except(:compatibility_body), actor: current_user)
+          name:, **parsed.except(:compatibility_body), actor: current_user,
+          require_compatibility: true)
       version = current_group_version(group)
       return render_group_representation(TagGroupRepr.one(group), version,
-                                         body: parsed.fetch(:compatibility_body),
                                          status: :created)
     end
 
@@ -179,7 +179,8 @@ class WikiPagesController < ApplicationController
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group:)
       TagGroupOperation.update!(
-          group:, name:, **parsed.except(:compatibility_body), actor: current_user)
+          group:, name:, **parsed.except(:compatibility_body), actor: current_user,
+          require_compatibility: true)
       return head :ok
     end
 

backend/app/models/tag.rb

@@ -305,9 +305,10 @@ class Tag < ApplicationRecord
           end
 
           TagVersioning.record!(source_tag, event_type: :discard, created_by_user:)
-          source_tag.tag_names.update_all(tag_id: target_tag.id, primary_flg: false,
+          target_languages = target_tag.tag_names.where(primary_flg: true).pluck(:language_code)
-                                          auto_generated: false,
+          source_tag.tag_names.where(language_code: target_languages)
-                                          updated_at: Time.current)
+              .update_all(primary_flg: false, auto_generated: false, updated_at: Time.current)
+          source_tag.tag_names.update_all(tag_id: target_tag.id, updated_at: Time.current)
           source_tag.destroy!
 
           TagVersioning.record!(target_tag, event_type: :update, created_by_user:)

backend/app/models/tag_description_version.rb

@@ -1,3 +1,3 @@
 class TagDescriptionVersion < ApplicationRecord
-  ;
+  before_create { SharedResourceIdAllocator.assign!(self) }
 end

backend/app/models/tag_group.rb

@@ -11,7 +11,7 @@ class TagGroup < ApplicationRecord
   has_many :placements, -> { order(:position) },
            class_name: 'TagGroupPlacement', dependent: :delete_all
   has_many :versions, -> { order(:version_no) },
-           class_name: 'TagGroupVersion', dependent: :delete_all
+           class_name: 'TagGroupVersion'
 
   validates :name, presence: true, uniqueness: true, length: { maximum: 255 }
   validates :version_no, numericality: { only_integer: true, greater_than: 0 }

backend/app/models/tag_group_version.rb

@@ -1,6 +1,8 @@
 class TagGroupVersion < ApplicationRecord
   include VersionRecord
 
+  before_create { SharedResourceIdAllocator.assign!(self) }
+
   belongs_to :tag_group
 
   scope :ordered, -> { order(:version_no) }

backend/app/models/tag_name_sanitisation_rule.rb

@@ -16,31 +16,36 @@ class TagNameSanitisationRule < ApplicationRecord
 
     def apply!
       Language.find_each do |language|
-        TagName.where(language:).find_each do |tn|
+        TagName.where(language:).find_each do |candidate|
-          name = sanitise(tn.name)
-          next if name == tn.name
-
           TagName.transaction do
+            tn = TagName.find_by(id: candidate.id)
+            next unless tn
+
+            name = sanitise(tn.name)
+            next if name == tn.name
+
             existing_tn = TagName.find_by(language:, name:)
-            if existing_tn
+            source_tag = tn.tag
-              unless existing_tn.primary_flg
+            target_tag = existing_tn ? existing_tn.tag : source_tag
-                existing_tn = TagName.find_by!(language:,
+            [source_tag, target_tag].uniq(&:id).sort_by(&:id).each(&:lock!)
-                                               tag_id: existing_tn.tag_id,
+            TagVersioning.ensure_snapshot!(source_tag, created_by_user: nil)
-                                               primary_flg: true)
+
+            if existing_tn && target_tag != source_tag
+              Tag.merge_tags!(target_tag, source_tag)
+              tn.reload.destroy!
+            elsif existing_tn
+              if tn.primary?
+                existing_tn.destroy!
+                tn.update_columns(name:, updated_at: Time.current)
+              else
+                tn.destroy!
               end
-              next if existing_tn.id == tn.id
+            else
-
+              # TagName 側の自動サニタイズを回避
-              existing_tag = existing_tn.tag
+              tn.update_columns(name:, updated_at: Time.current)
-              source_tag = tn.tag
-
-              Tag.merge_tags!(existing_tag, source_tag) if existing_tag != source_tag
-              tn.destroy!
-
-              next
             end
 
-            # TagName 側の自動サニタイズを回避
+            TagVersioning.record!(target_tag, event_type: :update, created_by_user: nil)
-            tn.update_columns(name:, updated_at: Time.current)
           end
         end
       end

backend/app/services/shared_resource_id_allocator.rb

@@ -4,7 +4,14 @@ require 'digest'
 class SharedResourceIdAllocator
   SPACES = {
       'tags' => ['tags', 'external_tags'],
-      'wiki' => ['tag_descriptions', 'tag_groups'] }.freeze
+      'wiki' => ['tag_descriptions', 'tag_groups'],
+      'wiki_history' => ['tag_description_versions', 'tag_group_versions'] }.freeze
+  HISTORY_IDS = {
+      'tags' => [
+          ['tag_versions', 'tag_id'],
+          ['nico_tag_versions', 'tag_id'],
+          ['tag_description_versions', 'tag_id']],
+      'wiki' => [['tag_group_versions', 'tag_group_id']] }.freeze
   LOCK_TIMEOUT = 10
 
   def self.assign! record
@@ -13,7 +20,9 @@ class SharedResourceIdAllocator
 
     connection = record.class.connection
     transaction = record.class.current_transaction
-    raise ActiveRecord::ActiveRecordError, 'Shared ID requires a transaction' unless transaction.open?
+    unless transaction.open?
+      raise ActiveRecord::ActiveRecordError, 'Shared ID requires a transaction'
+    end
 
     database = connection.pool.db_config.database
     name = "btrc:ids:#{ Digest::SHA256.hexdigest(database)[0, 16] }:#{ space }"
@@ -41,16 +50,45 @@ class SharedResourceIdAllocator
       raise
     end
 
-    return if record.id.present?
+    next_id = record.class.uncached do
-
+      historical_max = HISTORY_IDS.fetch(space, []).map do |table, column|
-    # Locking reads see committed maxima even after earlier repeatable reads.
-    maxima = record.class.uncached do
-      tables.map do |table|
         quoted_table = connection.quote_table_name(table)
+        quoted_column = connection.quote_column_name(column)
         connection.select_value(
-            "SELECT id FROM #{ quoted_table } ORDER BY id DESC LIMIT 1 FOR UPDATE").to_i
+            "SELECT MAX(#{ quoted_column }) FROM #{ quoted_table }").to_i
-      end
+      end.max.to_i
+      [next_ids(connection, tables).max, historical_max + 1].max
     end
-    record.id = maxima.max + 1
+    if record.id.present?
+      if record.id < next_id
+        raise ActiveRecord::RecordNotUnique, 'Shared ID is below the reserved position'
+      end
+    else
+      record.id = next_id
+    end
+    # The INSERT advances InnoDB's persistent counter, including explicit IDs.
   end
+
+  def self.next_ids connection, tables
+    expiry = connection.select_value('SELECT @@SESSION.information_schema_stats_expiry').to_i
+    begin
+      connection.execute('SET SESSION information_schema_stats_expiry = 0')
+      quoted_tables = tables.map { connection.quote(_1) }.join(', ')
+      rows = connection.select_all(<<~SQL).to_a
+        SELECT TABLE_NAME, ENGINE, AUTO_INCREMENT
+        FROM information_schema.tables
+        WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME IN (#{ quoted_tables })
+      SQL
+      persistent = rows.all? do |row|
+        row['ENGINE'] == 'InnoDB' && row['AUTO_INCREMENT'].to_i.positive?
+      end
+      unless rows.size == tables.size && persistent
+        raise ActiveRecord::ActiveRecordError, 'Persistent InnoDB counters are required'
+      end
+      rows.map { _1.fetch('AUTO_INCREMENT').to_i }
+    ensure
+      connection.execute("SET SESSION information_schema_stats_expiry = #{ expiry }")
+    end
+  end
+  private_class_method :next_ids
 end

backend/app/services/tag_description_operation.rb

@@ -40,15 +40,14 @@ class TagDescriptionOperation
   def self.record_version! description:, body:, user:
     creating = description.new_record?
     version_no = creating ? 1 : description.version_no + 1
-    version = TagDescriptionVersion.create!(
+    description.created_by_user_id = user.id if creating
+    description.update!(body:, version_no:, updated_by_user_id: user.id)
+    TagDescriptionVersion.create!(
         tag_id: description.tag_id, language_code: description.language_code,
         version_no:, event_type: creating ? 'create' : 'update', body:,
         source_language_code: description.source_language_code,
         source_version_no: description.source_version_no,
         created_by_user_id: user.id, created_at: Time.current)
-    description.created_by_user_id = user.id if creating
-    description.update!(body:, version_no:, updated_by_user_id: user.id)
-    version
   end
   private_class_method :record_version!
 

backend/app/services/tag_group_operation.rb

@@ -1,7 +1,8 @@
 class TagGroupOperation
   MAX_PLACEMENT_DEPTH = 5
 
-  def self.create!(name:, description:, members:, placements:, actor:)
+  def self.create!(name:, description:, members:, placements:, actor:,
+                   require_compatibility: false)
     ApplicationRecord.transaction do
       group = TagGroup.new(version_no: 1, created_by_user: actor,
                            updated_by_user: actor)
@@ -10,27 +11,40 @@ class TagGroupOperation
                               description: attributes.fetch(:description))
       group.save!
       persist_structure!(group:, attributes:, actor:)
+      validate_compatibility!(group) if require_compatibility
       persist_version!(group:, attributes:, actor:, event_type: 'create')
       group
     end
   end
 
-  def self.update!(group:, name:, description:, members:, placements:, actor:)
+  def self.update!(group:, name:, description:, members:, placements:, actor:,
+                   require_compatibility: false)
     ApplicationRecord.transaction do
       group.lock!
       attributes = prepare!(group:, name:, description:, members:, placements:)
-      next group if unchanged?(group, attributes)
+      if unchanged?(group, attributes)
+        validate_compatibility!(group) if require_compatibility
+        next group
+      end
 
       group.update!(name: attributes.fetch(:name),
                     description: attributes.fetch(:description),
                     version_no: group.version_no + 1,
                     updated_by_user: actor)
       persist_structure!(group:, attributes:, actor:)
+      validate_compatibility!(group) if require_compatibility
       persist_version!(group:, attributes:, actor:, event_type: 'update')
       group
     end
   end
 
+  def self.validate_compatibility! group
+    TagGroupMarkdownRenderer.render(TagGroupRepr.one(group))
+  rescue TagGroupMarkdownRenderer::UnsupportedStructure => error
+    invalid!(group, :base, error.message)
+  end
+  private_class_method :validate_compatibility!
+
   def self.prepare!(group:, name:, description:, members:, placements:)
     record = group
     normalized_name = name.to_s.strip