feat: 別名を検索に展開（#20） (#243)

#20

#20 テスト・ケースのみ追記

#20

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #243

backend/app/controllers/posts_controller.rb

@@ -97,6 +97,8 @@ class PostsController < ApplicationController
       tags = Tag.normalise_tags(tag_names)
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
+
+      post.reload
       render json: post.as_json(include: { tags: { only: [:id, :category, :post_count],
                                                    methods: [:name, :has_wiki] } }),
              status: :created
@@ -136,6 +138,8 @@ class PostsController < ApplicationController
              Tag.normalise_tags(tag_names, with_tagme: false)
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
+
+      post.reload
       json = post.as_json
       json['tags'] = build_tag_tree_for(post.tags)
       render json:, status: :ok
@@ -197,6 +201,8 @@ class PostsController < ApplicationController
   end
 
   def filter_posts_by_tags tag_names, match_type
+    tag_names = TagName.canonicalise(tag_names)
+
     posts = Post.joins(tags: :tag_name)
 
     if match_type == 'any'