Friends function

README.md

@@ -1,24 +1,13 @@
-# README
+##### Prerequisites
 
-This README would normally document whatever steps are necessary to get the
-application up and running.
+The setups steps expect following tools installed on the system.
 
-Things you may want to cover:
+- Github
+- Ruby [3.2.2](https://github.com/organization/project-name/blob/master/.ruby-version#L1)
+- Rails [7.0.5](https://github.com/organization/project-name/blob/master/Gemfile#L12)
 
-* Ruby version
+##### 1. Check out the repository
 
-* System dependencies
-
-* Configuration
-
-* Database creation
-
-* Database initialization
-
-* How to run the test suite
-
-* Services (job queues, cache servers, search engines, etc.)
-
-* Deployment instructions
-
-* ...
+```bash
+git clone git@github.com:organization/project-name.git
+```

app/controllers/api/v1/friends_controller.rb

@@ -0,0 +1,20 @@
+module Api
+  module V1
+    class FriendsController < AuthentificateController
+      def index
+        result = Api::V1::Friends::Index.call(current_user:, serializer: FriendSerializer)
+        default_handler(result)
+      end
+
+      def create
+        result = Api::V1::Friends::AddFriend.call(params:, current_user:, serializer: FriendSerializer)
+        default_handler(result)
+      end
+
+      def destroy
+        result = Api::V1::Friends::RemoveFriend.call(params:, current_user:)
+        default_handler(result)
+      end
+    end
+  end
+end

app/interactors/api/v1/friends/add_friend.rb

@@ -0,0 +1,48 @@
+module Api
+  module V1
+    module Friends
+      class AddFriend < BaseInteractor
+        def call
+          return not_found unless current_friend
+          return good_outcome if friend_excist?
+
+          current_form.save
+          result
+        end
+
+        private
+
+        def good_outcome
+          context.status = :ok
+          context.success_message = { friend: :already_added }
+        end
+
+        def friend_excist?
+          context.current_user.friends.each do |friend|
+            return true if friend.user == current_friend
+          end
+
+          false
+        end
+
+        def current_form
+          @current_form ||= UserFriend.new(user_id: context.current_user.id, friend_id: friend_form.id)
+        end
+
+        def current_friend
+          @current_friend ||= User.find_by(id: context.params[:user_id])
+        end
+
+        def friend_form
+          @friend_form ||= Friend.create(user_id: current_friend.id)
+        end
+
+        def result
+          context.form = current_form
+          context.status = :created
+          context.success_message = { friend: :added }
+        end
+      end
+    end
+  end
+end

app/interactors/api/v1/friends/index.rb

@@ -0,0 +1,13 @@
+module Api
+  module V1
+    module Friends
+      class Index < BaseInteractor
+        def call
+          context.form = context.current_user.friends
+          context.status = :ok
+          context.success_message = { operation: :success }
+        end
+      end
+    end
+  end
+end

app/interactors/api/v1/friends/remove_friend.rb

@@ -0,0 +1,25 @@
+module Api
+  module V1
+    module Friends
+      class RemoveFriend < BaseInteractor
+        def call
+          return not_found unless current_friend
+          return access_denied unless belong_to_user?(Api::V1::FriendPolicy, current_friend)
+
+          result
+        end
+
+        private
+
+        def current_friend
+          @current_friend ||= Friend.find_by(id: context.params[:id])
+        end
+
+        def result
+          context.status = :no_content
+          current_friend.destroy
+        end
+      end
+    end
+  end
+end

app/models/friend.rb

@@ -0,0 +1,6 @@
+class Friend < ApplicationRecord
+  belongs_to :user
+
+  has_many :user_friends, dependent: :destroy
+  has_many :users, through: :user_friends
+end

app/models/user.rb

@@ -3,4 +3,6 @@ class User < ApplicationRecord
 
   has_many :messages, dependent: :destroy
   has_many :news, dependent: :destroy
+  has_many :user_friends, dependent: :destroy
+  has_many :friends, through: :user_friends
 end

app/models/user_friend.rb

@@ -0,0 +1,4 @@
+class UserFriend < ApplicationRecord
+  belongs_to :user
+  belongs_to :friend
+end

app/policies/api/v1/friend_policy.rb

@@ -0,0 +1,9 @@
+module Api
+  module V1
+    class FriendPolicy < ApplicationPolicy
+      def belong_to_user?
+        @subject.friends.include?(@model)
+      end
+    end
+  end
+end

app/serializers/friend_serializer.rb

@@ -0,0 +1,3 @@
+class FriendSerializer < ApplicationSerializer
+  attributes :user_id, :created_at, :updated_at
+end

config/routes.rb

@@ -10,6 +10,7 @@
       resources :messages
       resources :news
       resource :newsline, only: :show
+      resources :friends, except: %i[update show]
     end
   end
 end

db/migrate/20230630084051_create_friends.rb

@@ -0,0 +1,9 @@
+class CreateFriends < ActiveRecord::Migration[7.0]
+  def change
+    create_table :friends do |t|
+      t.references :user, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20230704074345_create_user_friends.rb

@@ -0,0 +1,10 @@
+class CreateUserFriends < ActiveRecord::Migration[7.0]
+  def change
+    create_table :user_friends do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :friend, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

spec/factories/friends.rb

@@ -0,0 +1,5 @@
+FactoryBot.define do
+  factory :friend do
+    user { create(:user) }
+  end
+end

spec/factories/user_friends.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :user_friend do
+    user { create(:user) }
+    friend { create(:friend) }
+  end
+end

spec/interactors/api/v1/friends/add_friend_spec.rb

@@ -0,0 +1,28 @@
+RSpec.describe Api::V1::Friends::AddFriend do
+  subject(:result) { described_class.call(params:, current_user: user) }
+
+  let!(:user) { create(:user) }
+
+  describe 'Success' do
+    let!(:friend_user) { create(:user) }
+    let(:params) { { user_id: friend_user.id } }
+
+    it 'is create message' do
+      expect { result }.to change(Friend, :count).from(0).to(1)
+    end
+
+    it 'is result success' do
+      expect(result).to be_success
+    end
+  end
+
+  describe 'Wrong' do
+    context 'when not found user' do
+      let(:params) { { user_id: 0 } }
+
+      it 'is result not success' do
+        expect(result).not_to be_success
+      end
+    end
+  end
+end

spec/models/friend_spec.rb

@@ -0,0 +1,5 @@
+RSpec.describe Friend, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:user) }
+  end
+end

spec/models/user_friend_spec.rb

@@ -0,0 +1,6 @@
+RSpec.describe UserFriend, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:user) }
+    it { is_expected.to belong_to(:friend) }
+  end
+end