#55 いったん中断；外部タグ分離優先

backend/app/controllers/materials_controller.rb

@@ -72,6 +72,7 @@ class MaterialsController < ApplicationController
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
 
+    locale = resolve_locale!
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     file_sha256 = MaterialFileSha256.from_upload(file)
@@ -89,7 +90,7 @@ class MaterialsController < ApplicationController
 
     begin
       Material.transaction do
-        tag = resolve_material_tag!(tag_name_raw)
+        tag = resolve_material_tag!(locale, tag_name_raw)
         material = Material.new(tag:, url:,
                                 created_by_user: current_user,
                                 updated_by_user: current_user)
@@ -237,9 +238,7 @@ class MaterialsController < ApplicationController
   end
 
   def resolve_material_tag! locale, tag_name_raw
-    tag_name = TagName.find_or_create_by!(language_code: locale.language_code,
-                                          name: tag_name_raw)
-    tag_name.tag || Tag.create!(tag_name:, category: :material)
+    Tag.find_or_create_by_tag_name!(locale, tag_name_raw, category: :material)
   end
 
   def material_index_needs_tag_name? filters