#428

backend/app/models/tag_name.rb

@@ -35,10 +35,17 @@ class TagName < ApplicationRecord
 
   def self.generate_name locale, tag, base_tag_name
     fallback = "Tag_##{ tag.id }"
-    return fallback unless locale.language_code == 'ain' && base_tag_name&.language_code == 'ja'
-
-    name = TagNameTranscription.ainu(base_tag_name.name)
-    candidate = new(tag:, name:, language_code: 'ain', script_code: 'Kana',
+    name =
+        case [locale.language_code, base_tag_name&.language_code]
+        when ['ain', 'ja']
+          TagNameTranscription.ainu(base_tag_name.name)
+        when ['ja', 'ain']
+          base_tag_name.name
+        else
+          return fallback
+        end
+    candidate = new(tag:, name:, language_code: locale.language_code,
+                    script_code: locale.script_code,
                     primary_flg: true, auto_generated: true)
     candidate.valid? ? name : fallback
   rescue TagNameTranscription::Unconvertible