#428

backend/app/models/tag.rb

@@ -142,7 +142,8 @@ class Tag < ApplicationRecord
                              with_tagme: true,
                              with_no_deerjikist: true,
                              deny_deprecated: false,
-                             with_sections: false
+                             with_sections: false,
+                             created_by_user: nil
       if tag_names.any? { |n| n.downcase.start_with?('nico:') }
         raise NicoTagNormalisationError
       end
@@ -171,7 +172,8 @@ class Tag < ApplicationRecord
 
         name = TagName.canonicalise(locale, name).first
 
-        find_or_create_by_tag_name!(locale, name, category: (cat || :general)).tap do |tag|
+        find_or_create_by_tag_name!(locale, name, category: (cat || :general),
+                                   created_by_user:).tap do |tag|
           if deny_deprecated && tag.deprecated?
             raise DeprecatedTagNormalisationError, [tag.name(locale.language_code)]
           end
@@ -259,7 +261,7 @@ class Tag < ApplicationRecord
       [left_end_ms, right_end_ms].max
     end
 
-    def find_or_create_by_tag_name! locale, name, category:
+    def find_or_create_by_tag_name! locale, name, category:, created_by_user: nil
       language_code = locale.language_code
       name = name.to_s.strip
 
@@ -268,11 +270,10 @@ class Tag < ApplicationRecord
         tn = TagName.lock.find_by(language_code:, name:)
         next tn.tag if tn
 
-        tag = Tag.create!(category:)
-        TagName.create!(tag:, language_code:, name:,
-                        script_code: locale.script_code, primary_flg: true,
-                        auto_generated: false)
-        TagNameCompletion.for_tag!(tag)
+        tag = Tag.new(category:)
+        tag.tag_names.build(language_code:, name:, script_code: locale.script_code,
+                            primary_flg: true, auto_generated: false)
+        TagNameCompletion.for_tag!(tag, created_by_user:)
         tag.association(:tag_names).reset
 
         tag