From c72b60527785f8130fddbed99a4f873dfaace7a0 Mon Sep 17 00:00:00 2001
From: Karine Vieira <kv.vieira1@gmail.com>
Date: Sun, 14 Jul 2024 15:59:37 -0300
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20create=20feed=20list?=
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---
 app/controllers/posts_controller.rb     |  2 +-
 app/operations/posts/feed_list.rb       | 22 ++++++++++++++++++++++
 app/operations/posts/list.rb            |  4 +++-
 spec/operations/posts/feed_list_spec.rb | 23 +++++++++++++++++++++++
 spec/operations/posts/list_spec.rb      |  4 ++--
 5 files changed, 51 insertions(+), 4 deletions(-)
 create mode 100644 app/operations/posts/feed_list.rb
 create mode 100644 spec/operations/posts/feed_list_spec.rb

diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index f028f26..e7bcec4 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -4,7 +4,7 @@ class PostsController < ApplicationController
   before_action :authorize_action!, only: %i[edit update destroy]
 
   def index
-    result = Posts::List.result
+    result = Posts::FeedList.result(current_user: current_user)
 
     respond_to do |format|
       format.html { render Posts::IndexPage.new(posts: result.posts, user: current_user) }
diff --git a/app/operations/posts/feed_list.rb b/app/operations/posts/feed_list.rb
new file mode 100644
index 0000000..f97dfdc
--- /dev/null
+++ b/app/operations/posts/feed_list.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Posts
+  class FeedList < Actor
+    input :current_user, type: User
+
+    output :posts, type: Enumerable
+
+    def call
+      feed_posts = Post.where(user_id: feed_user_ids)
+
+      self.posts = Posts::List.result(scope: feed_posts).posts
+    end
+
+    private
+
+    def feed_user_ids
+      following_users = current_user.following.pluck(:id)
+      following_users.push(current_user.id)
+    end
+  end
+end
diff --git a/app/operations/posts/list.rb b/app/operations/posts/list.rb
index dc806fa..fbbc5a5 100644
--- a/app/operations/posts/list.rb
+++ b/app/operations/posts/list.rb
@@ -2,10 +2,12 @@
 
 module Posts
   class List < Actor
+    input :scope, type: ActiveRecord::Relation
+
     output :posts, type: Enumerable
 
     def call
-      self.posts = Post.order(created_at: :desc).all
+      self.posts = scope.order(created_at: :desc)
     end
   end
 end
diff --git a/spec/operations/posts/feed_list_spec.rb b/spec/operations/posts/feed_list_spec.rb
new file mode 100644
index 0000000..d39876c
--- /dev/null
+++ b/spec/operations/posts/feed_list_spec.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe Posts::FeedList, type: :operation do
+  describe ".result" do
+    it "returns posts from the user and their followed users" do
+      current_user = create(:user)
+      followed_user = create(:user)
+      not_followed_user = create(:user)
+
+      create(:follow, follower: current_user, followed: followed_user)
+
+      post_a = create(:post, user: followed_user)
+      _post_b = create(:post, user: not_followed_user)
+      post_c = create(:post, user: current_user)
+
+      result = described_class.result(current_user: current_user)
+
+      expect(result.posts).to contain_exactly(post_a, post_c)
+    end
+  end
+end
diff --git a/spec/operations/posts/list_spec.rb b/spec/operations/posts/list_spec.rb
index 279cdf2..ea3a765 100644
--- a/spec/operations/posts/list_spec.rb
+++ b/spec/operations/posts/list_spec.rb
@@ -5,7 +5,7 @@
 RSpec.describe Posts::List, type: :operation do
   describe ".result" do
     it "is successful" do
-      result = described_class.result
+      result = described_class.result(scope: Post.all)
 
       expect(result.success?).to be true
     end
@@ -15,7 +15,7 @@
       second_post = create(:post, subtitle: "Second post")
       third_post = create(:post, subtitle: "Third post")
 
-      result = described_class.result
+      result = described_class.result(scope: Post.all)
 
       expect(result.posts.to_a).to eq [third_post, second_post, first_post]
     end