#101 マイグレとコントローラ

backend/app/controllers/posts_controller.rb

@@ -8,8 +8,11 @@ class PostsController < ApplicationController
     limit = params[:limit].presence&.to_i
     cursor = params[:cursor].presence
 
-    q = filtered_posts.order(created_at: :desc)
-    q = q.where('posts.created_at < ?', Time.iso8601(cursor)) if cursor
+    created_at = ('COALESCE(posts.original_created_before - INTERVAL 1 SECOND,' +
+                  'posts.original_created_from,' +
+                  'posts.created_at)')
+    q = filtered_posts.order(Arel.sql("#{ created_at } DESC"))
+    q = q.where("#{ created_at } < ?", Time.iso8601(cursor)) if cursor
 
     posts = limit ? q.limit(limit + 1) : q
 
@@ -20,14 +23,14 @@ class PostsController < ApplicationController
     end
 
     render json: { posts: posts.map { |post|
-      post.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } }).tap { |json|
+      post.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } }).tap do |json|
         json['thumbnail'] =
             if post.thumbnail.attached?
               rails_storage_proxy_url(post.thumbnail, only_path: false)
             else
               nil
             end
-      }
+      end
     }, next_cursor: }
   end
 
@@ -39,7 +42,7 @@ class PostsController < ApplicationController
 
     render json: (post
                   .as_json(include: { tags: { only: [:id, :name, :category, :post_count] } })
-                  .merge(viewed: viewed))
+                  .merge(viewed:))
   end
 
   # GET /posts/1
@@ -60,7 +63,7 @@ class PostsController < ApplicationController
     return head :forbidden unless current_user.member?
 
     # TODO: URL が正規のものがチェック，不正ならエラー
-    # TODO: title、URL は必須にする．
+    # TODO: URL は必須にする（タイトルは省略可）．
     # TODO: サイトに応じて thumbnail_base 設定
     title = params[:title]
     url = params[:url]