#69

backend/app/controllers/posts_controller.rb

@@ -5,24 +5,18 @@ require 'nokogiri'
 class PostsController < ApplicationController
   # GET /posts
   def index
-    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
+    posts = filtered_posts
     render json: posts.as_json(include: { tags: { only: [:id, :name, :category] } })
   end
 
+  def random
+    post = filtered_posts.order('RAND()').first
+    viewed = current_user&.viewed?(post)
+    render json: (post
+                  .as_json(include: { tags: { only: [:id, :name, :category] } })
+                  .merge(viewed: viewed))
+  end
+
   # GET /posts/1
   def show
     post = Post.includes(:tags).find(params[:id])
@@ -86,4 +80,24 @@ class PostsController < ApplicationController
   # DELETE /posts/1
   def destroy
   end
+
+  private
+
+  def filtered_posts
+    tag_names = params[:tags]&.split(',')
+    match_type = params[:match]
+    tag_names.present? ? filter_posts_by_tags(tag_names, match_type) : Post.all
+  end
+
+  def filter_posts_by_tags tag_names, match_type
+    posts = Post.joins(:tags)
+    if match_type == 'any'
+      posts = posts.where(tags: { name: tag_names }).distinct
+    else
+      tag_names.each do |tag|
+        posts = posts.where(id: Post.joins(:tags).where(tags: { name: tag }))
+      end
+    end
+    posts.distinct
+  end
 end