#21 ちょっと修正

backend/app/controllers/tags_controller.rb

@@ -24,12 +24,11 @@ class TagsController < ApplicationController
             .group('tags.id')
             .order('post_count DESC, tags.name ASC')
             .limit(20))
-    render json: tags.map do |tag|
-      { id:       tag.id,
+    render json: tags.map { |tag| {
+        id:       tag.id,
         name:     tag.name,
         category: tag.category,
-        count:    tag.post_count }
-    end
+        count:    tag.post_count } }
   end
 
   def show