Representations 追加（#241） (#267)

#241

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #267

backend/app/representations/post_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module PostRepr
+  BASE = { include: { tags: TagRepr::BASE } }.freeze
+
+  module_function
+
+  def base post
+    post.as_json(BASE)
+  end
+
+  def many posts
+    posts.map { |p| base(p) }
+  end
+end