Add likes model, controller and tests

app/assets/stylesheets/likes.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the likes controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/likes_controller.rb

@@ -0,0 +1,33 @@
+class LikesController < ApplicationController
+  before_action :authenticate_user!
+
+  def create
+    like = Like.new(like_params)
+
+    if like.save
+      render json: like, status: :created
+    else
+      render json: {
+        error: I18n.t('errors.likes.create', message: like.errors.full_messages)
+      }, status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    like = Like.where(like_params)
+
+    if like.destroy
+      render json: {}, status: :no_content
+    else
+      render json: {
+        error: I18n.t('errors.likes.destroy', message: like.errors.full_messages)
+      }, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+    def like_params
+      params.permit(:post_id).merge(user_id: current_user.id)
+    end
+end

app/helpers/likes_helper.rb

@@ -0,0 +1,2 @@
+module LikesHelper
+end

app/models/like.rb

@@ -0,0 +1,6 @@
+class Like < ApplicationRecord
+  belongs_to :user
+  belongs_to :post
+
+  validates :user_id, uniqueness: { scope: :post_id }
+end

app/models/post.rb

@@ -2,6 +2,7 @@ class Post < ApplicationRecord
   belongs_to :board
   belongs_to :user
   belongs_to :post_status, optional: true
+  has_many :likes, dependent: :destroy
   has_many :comments, dependent: :destroy
 
   validates :title, presence: true, length: { in: 4..64 }

app/models/user.rb

@@ -4,6 +4,7 @@ class User < ApplicationRecord
          :confirmable
   
   has_many :posts, dependent: :destroy
+  has_many :likes, dependent: :destroy
   has_many :comments, dependent: :destroy
 
   enum role: [:user, :moderator, :admin]

config/locales/en.yml

@@ -4,5 +4,7 @@ en:
     post:
       create: 'Post create error: %{message}'
       update: 'Post update error: %{message}'
+    like:
+      create: 'Like create error: %{message}'
     comment:
       create: 'Comment create error: %{message}'

config/routes.rb

@@ -14,9 +14,10 @@ Rails.application.routes.draw do
   
   devise_for :users
 
-  resources :boards, only: [:show]
   resources :posts, only: [:index, :create, :show, :update] do
+    resource :likes, only: [:create, :destroy]
     resources :comments, only: [:index, :create]
   end
+  resources :boards, only: [:show]
   resources :post_statuses, only: [:index]
 end

db/migrate/20190927094233_create_likes.rb

@@ -0,0 +1,12 @@
+class CreateLikes < ActiveRecord::Migration[6.0]
+  def change
+    create_table :likes do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :post, null: false, foreign_key: true
+
+      t.timestamps
+    end
+
+    add_index :likes, [:user_id, :post_id], unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_09_18_151626) do
+ActiveRecord::Schema.define(version: 2019_09_27_094233) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -36,6 +36,16 @@ ActiveRecord::Schema.define(version: 2019_09_18_151626) do
     t.index ["user_id"], name: "index_comments_on_user_id"
   end
 
+  create_table "likes", force: :cascade do |t|
+    t.bigint "user_id", null: false
+    t.bigint "post_id", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["post_id"], name: "index_likes_on_post_id"
+    t.index ["user_id", "post_id"], name: "index_likes_on_user_id_and_post_id", unique: true
+    t.index ["user_id"], name: "index_likes_on_user_id"
+  end
+
   create_table "post_statuses", force: :cascade do |t|
     t.string "name", null: false
     t.string "color", null: false
@@ -81,6 +91,8 @@ ActiveRecord::Schema.define(version: 2019_09_18_151626) do
   add_foreign_key "comments", "comments", column: "parent_id"
   add_foreign_key "comments", "posts"
   add_foreign_key "comments", "users"
+  add_foreign_key "likes", "posts"
+  add_foreign_key "likes", "users"
   add_foreign_key "posts", "boards"
   add_foreign_key "posts", "post_statuses"
   add_foreign_key "posts", "users"

spec/factories/likes.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :like do
+    user
+    post
+  end
+end

spec/models/like_spec.rb

@@ -0,0 +1,19 @@
+require 'rails_helper'
+
+RSpec.describe Like, type: :model do
+  let(:like) { FactoryBot.build(:like) }
+
+  it 'is valid' do
+    expect(like).to be_valid
+  end
+
+  it 'must have a user_id' do
+    like.user = nil
+    expect(like).to be_invalid
+  end
+
+  it 'must have a post_id' do
+    like.post = nil
+    expect(like).to be_invalid
+  end
+end

spec/routing/likes_routing_spec.rb

@@ -0,0 +1,18 @@
+require 'rails_helper'
+
+RSpec.describe 'likes routing', :aggregate_failures, type: :routing do
+  it 'routes likes' do
+    expect(post: '/posts/1/likes').to route_to(
+      controller: 'likes', action: 'create', post_id: "1"
+    )
+    expect(delete: '/posts/1/likes').to route_to(
+      controller: 'likes', action: 'destroy', post_id: "1"
+    )
+
+    expect(get: '/posts/1/likes').not_to be_routable
+    expect(get: '/posts/1/likes/1').not_to be_routable
+    expect(get: '/posts/1/likes/new').not_to be_routable
+    expect(get: '/posts/1/likes/1/edit').not_to be_routable
+    expect(patch: '/posts/1/likes/1').not_to be_routable
+  end
+end