既存タグ名と同名の Wiki を新規作成できないバグ修正（#257） (#260)

#257

Merge remote-tracking branch 'origin/main' into feature/257

#257

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #260

backend/app/controllers/wiki_pages_controller.rb

@@ -87,13 +87,13 @@ class WikiPagesController < ApplicationController
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.member?
 
-    title = params[:title]&.strip
+    name = params[:title]&.strip
     body = params[:body].to_s
 
-    return head :unprocessable_entity if title.blank? || body.blank?
-
-    page = WikiPage.new(title:, created_user: current_user, updated_user: current_user)
+    return head :unprocessable_entity if name.blank? || body.blank?
 
+    tag_name = TagName.find_or_create_by!(name:)
+    page = WikiPage.new(tag_name:, created_user: current_user, updated_user: current_user)
     if page.save
       message = params[:message].presence
       Wiki::Commit.content!(page:, body:, created_user: current_user, message:)