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]