#7 ぼちぼち

backend/app/controllers/posts_controller.rb

@@ -3,14 +3,28 @@ class PostsController < ApplicationController
 
   # GET /posts
   def index
-    @posts = Post.all
-
+    if params[:tags].present?
+      tag_names = params[:tags].split(',')
+      match_type = params[:match]
+      if match_type == 'any'
+        @posts = Post.joins(:tags).where(tags: { name: tag_names }).distinct
+      else
+        @posts = Post.joins(:tags)
+        tag_names.each do |tag|
+          @posts = @posts.where(id: Post.joins(:tags).where(tags: { name: tag }))
+        end
+        @posts = @posts.distinct
+      end
+    else
+      @posts = Post.all
+    end
     render json: @posts
   end
 
   # GET /posts/1
   def show
-    render json: @post
+    @post = Post.includes(:tags).find(params[:id])
+    render json: @post.as_json(include: { tags: { only: [:id, :name] } })
   end
 
   # POST /posts