#59 関聯投稿一覧の追加

backend/app/controllers/posts_controller.rb

@@ -5,16 +5,16 @@ require 'nokogiri'
 class PostsController < ApplicationController
   # GET /posts
   def index
-    limit = (params[:limit] || 20).to_i
+    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
 
-    posts = q.limit(limit + 1)
+    posts = limit ? q.limit(limit + 1) : q
 
     next_cursor = nil
-    if posts.size > limit
+    if limit && posts.size > limit
       next_cursor = posts.last.created_at.iso8601(6)
       posts = posts.first(limit)
     end
@@ -51,7 +51,7 @@ class PostsController < ApplicationController
 
     render json: (post
                   .as_json(include: { tags: { only: [:id, :name, :category, :post_count] } })
-                  .merge(viewed: viewed))
+                  .merge(related: post.related(limit: 20), viewed:))
   end
 
   # POST /posts