add user follow feature

Gemfile

@@ -15,3 +15,5 @@ group :development, :test do
   gem "rspec-rails", "~> 5.1"
   gem "factory_bot_rails", "~> 6.2"
 end
+
+gem "faker", "~> 2.19"

Gemfile.lock

@@ -82,6 +82,8 @@ GEM
     factory_bot_rails (6.2.0)
       factory_bot (~> 6.2.0)
       railties (>= 5.0.0)
+    faker (2.19.0)
+      i18n (>= 1.6, < 2)
     globalid (1.0.0)
       activesupport (>= 5.0)
     i18n (1.10.0)
@@ -174,8 +176,6 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
-    shoulda-matchers (5.1.0)
-      activesupport (>= 5.2.0)
     strscan (3.0.1)
     thor (1.2.1)
     timeout (0.2.0)
@@ -193,12 +193,12 @@ DEPENDENCIES
   bootsnap
   debug
   factory_bot_rails (~> 6.2)
+  faker (~> 2.19)
   jbuilder
   pg (~> 1.1)
   puma (~> 5.0)
   rails (~> 7.0.2, >= 7.0.2.2)
   rspec-rails (~> 5.1)
-  shoulda-matchers (~> 5.1)
 
 RUBY VERSION
    ruby 3.1.1p18

app/controllers/user_follows_controller.rb

@@ -0,0 +1,53 @@
+class UserFollowsController < ApplicationController
+  before_action :set_user_follow, only: %i[ show update destroy ]
+
+  # GET /user_follows
+  # GET /user_follows.json
+  def index
+    @user_follows = UserFollow.all
+  end
+
+  # GET /user_follows/1
+  # GET /user_follows/1.json
+  def show
+  end
+
+  # POST /user_follows
+  # POST /user_follows.json
+  def create
+    @user_follow = UserFollow.new(user_follow_params)
+
+    if @user_follow.save
+      render :show, status: :created, location: @user_follow
+    else
+      render json: @user_follow.errors, status: :unprocessable_entity
+    end
+  end
+
+  # PATCH/PUT /user_follows/1
+  # PATCH/PUT /user_follows/1.json
+  def update
+    if @user_follow.update(user_follow_params)
+      render :show, status: :ok, location: @user_follow
+    else
+      render json: @user_follow.errors, status: :unprocessable_entity
+    end
+  end
+
+  # DELETE /user_follows/1
+  # DELETE /user_follows/1.json
+  def destroy
+    @user_follow.destroy
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_user_follow
+      @user_follow = UserFollow.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def user_follow_params
+      params.require(:user_follow).permit(:follower_id, :followed_id)
+    end
+end

app/models/user_follow.rb

@@ -0,0 +1,4 @@
+class UserFollow < ApplicationRecord
+  belongs_to :follower, class_name: 'User'
+  belongs_to :followed, class_name: 'User'
+end

app/views/user_follows/_user_follow.json.jbuilder

@@ -0,0 +1,2 @@
+json.extract! user_follow, :id, :follower_id, :followed_id, :created_at, :updated_at
+json.url user_follow_url(user_follow, format: :json)

app/views/user_follows/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @user_follows, partial: "user_follows/user_follow", as: :user_follow

app/views/user_follows/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "user_follows/user_follow", user_follow: @user_follow

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  resources :user_follows, only: [:create, :destroy]
   resources :users, only: [:show]
 
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html

db/migrate/20220227175028_create_user_follows.rb

@@ -0,0 +1,10 @@
+class CreateUserFollows < ActiveRecord::Migration[7.0]
+  def change
+    create_table :user_follows do |t|
+      t.references :follower, references: :users, foreign_key: { to_table: :users }
+      t.references :followed, references: :users, foreign_key: { to_table: :users }
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,10 +10,19 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2022_02_27_172543) do
+ActiveRecord::Schema[7.0].define(version: 2022_02_27_175028) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "user_follows", force: :cascade do |t|
+    t.bigint "follower_id"
+    t.bigint "followed_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["followed_id"], name: "index_user_follows_on_followed_id"
+    t.index ["follower_id"], name: "index_user_follows_on_follower_id"
+  end
+
   create_table "users", force: :cascade do |t|
     t.string "username", limit: 14, null: false
     t.datetime "created_at", null: false
@@ -21,4 +30,6 @@ ActiveRecord::Schema[7.0].define(version: 2022_02_27_172543) do
     t.index ["username"], name: "index_users_on_username"
   end
 
+  add_foreign_key "user_follows", "users", column: "followed_id"
+  add_foreign_key "user_follows", "users", column: "follower_id"
 end

db/seeds.rb

@@ -1,3 +1,6 @@
-User.find_or_create_by(username: 'xpto')
 User.find_or_create_by(username: 'admin')
-User.find_or_create_by(username: 'geonizeli')
+xpto = User.find_or_create_by(username: 'xpto')
+geonizeli = User.find_or_create_by(username: 'geonizeli')
+
+UserFollow.find_or_create_by(follower_id: xpto.id, followed_id: geonizeli.id)
+UserFollow.find_or_create_by(follower_id: geonizeli.id, followed_id: xpto.id)

spec/factories/user_follows.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :user_follow do
+    follower { nil }
+    followed { nil }
+  end
+end

spec/factories/users.rb

@@ -1,5 +1,5 @@
 FactoryBot.define do
   factory :user do
-    username { "xpto" }
+    username { Faker::Internet.username.gsub(/[^0-9a-z ]/i, '') }
   end
 end

spec/requests/user_follows_spec.rb

@@ -0,0 +1,67 @@
+require 'rails_helper'
+
+RSpec.describe "/user_follows", type: :request do
+  let(:followed) { create(:user) }
+  let(:follower) { create(:user) }
+
+  let(:valid_attributes) {
+    {
+      followed_id: followed.id,
+      follower_id: follower.id
+    }
+  }
+
+  let(:invalid_attributes) {
+    {
+      followed_id: followed.id,
+      follower_id: 'follower.id'
+    }
+  }
+
+  let(:valid_headers) {
+    {}
+  }
+
+  describe "POST /create" do
+    context "with valid parameters" do
+      it "creates a new UserFollow" do
+        expect {
+          post user_follows_url,
+               params: { user_follow: valid_attributes }, headers: valid_headers, as: :json
+        }.to change(UserFollow, :count).by(1)
+      end
+
+      it "renders a JSON response with the new user_follow" do
+        post user_follows_url,
+             params: { user_follow: valid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:created)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+
+    context "with invalid parameters" do
+      it "does not create a new UserFollow" do
+        expect {
+          post user_follows_url,
+               params: { user_follow: invalid_attributes }, as: :json
+        }.to change(UserFollow, :count).by(0)
+      end
+
+      it "renders a JSON response with errors for the new user_follow" do
+        post user_follows_url,
+             params: { user_follow: invalid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+  end
+
+  describe "DELETE /destroy" do
+    it "destroys the requested user_follow" do
+      user_follow = UserFollow.create! valid_attributes
+      expect {
+        delete user_follow_url(user_follow), headers: valid_headers, as: :json
+      }.to change(UserFollow, :count).by(-1)
+    end
+  end
+end

spec/routing/user_follows_routing_spec.rb

@@ -0,0 +1,13 @@
+require "rails_helper"
+
+RSpec.describe UserFollowsController, type: :routing do
+  describe "routing" do
+    it "routes to #create" do
+      expect(post: "/user_follows").to route_to("user_follows#create")
+    end
+
+    it "routes to #destroy" do
+      expect(delete: "/user_follows/1").to route_to("user_follows#destroy", id: "1")
+    end
+  end
+end