add post like and unlike action

app/assets/javascripts/api/v1/likes.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/api/v1/likes.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the api/v1/likes controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/api/v1/application_controller.rb

@@ -4,9 +4,8 @@ class Api::V1::ApplicationController < ActionController::Base
   skip_before_action :verify_authenticity_token
 
   serialization_scope :current_user!
-  protect_from_forgery with: :exception
-
   before_action :current_user!
+  before_action :authenticate_user_from_token
 
   def current_user!
     @current_user = nil
@@ -34,4 +33,16 @@ class Api::V1::ApplicationController < ActionController::Base
     end
   end
 
+  private
+
+  def load_target_user
+    @target_user = User.find_by id: params[:user_id]
+    render json: {msg: '不能找到该用户'}, status: 404 unless @target_user
+  end
+
+  def load_post
+    @target_post = Post.find_by id: params[:post_id]
+    render json: {msg: '不能找到该文章'}, status: 404 unless @target_post
+  end
+
 end

app/controllers/api/v1/follow_controller.rb

@@ -1,7 +1,7 @@
 class Api::V1::FollowController < Api::V1::ApplicationController
 
-  skip_before_action :verify_authenticity_token
-  before_action :authenticate_user_from_token, :load_target_user
+
+  before_action :load_target_user
 
   def create
     if @current_user.stars.include? @target_user
@@ -21,11 +21,4 @@ class Api::V1::FollowController < Api::V1::ApplicationController
     end
   end
 
-  private
-
-  def load_target_user
-    @target_user = User.find_by id: params[:user_id]
-    render json: {msg: '不能找到该用户'}, status: 404 unless @target_user
-  end
-
 end

app/controllers/api/v1/likes_controller.rb

@@ -0,0 +1,24 @@
+class Api::V1::LikesController < Api::V1::ApplicationController
+
+  before_action :load_post
+
+  def like
+    if @current_user.likes.where(likable_id: @target_post).present?
+      render json: {msg: '你已经喜欢过该文章了'}, status: 400
+    else
+      @current_user.likes.create likable: @target_post
+      render json:{msg: 'done', likes_count: @target_post.likes_count}
+    end
+  end
+
+  def unlike
+    like = @current_user.likes.find_by(likable_id: @target_post)
+    if like.present?
+      like.destroy!
+      render json:{msg: 'done', likes_count: @target_post.likes_count}
+    else
+      render json: {msg: '不能进行该操作'}, status: 400
+    end
+  end
+
+end

app/controllers/application_controller.rb

@@ -2,11 +2,7 @@ class ApplicationController < ActionController::Base
   include ActionController::Serialization
 
   serialization_scope :current_user!
-  # Prevent CSRF attacks by raising an exception.
-  # For APIs, you may want to use :null_session instead.
-  # protect_from_forgery with: :exception
-  protect_from_forgery with: :exception
-
+  skip_before_action :verify_authenticity_token
   before_action :current_user!
 
   def current_user!

app/helpers/api/v1/likes_helper.rb

@@ -0,0 +1,2 @@
+module Api::V1::LikesHelper
+end

config/routes.rb

@@ -1,12 +1,6 @@
 require 'sidekiq/web'
 
 Rails.application.routes.draw do
-  namespace :api do
-    namespace :v1 do
-      resources :posts, only: [:create, :index, :show]
-    end
-  end
-
   devise_for :admin_users, ActiveAdmin::Devise.config
   ActiveAdmin.routes(self)
   devise_for :users
@@ -81,6 +75,11 @@ Rails.application.routes.draw do
         post :unfollow, to: 'follow#destroy'
       end
 
+      resources :posts, only: [:create, :index, :show] do
+        post :like, to: 'likes#like'
+        post :unlike, to: 'likes#unlike'
+      end
+
     end
   end
 end

db/migrate/20150812132728_add_likes_count_to_post.rb

@@ -0,0 +1,5 @@
+class AddLikesCountToPost < ActiveRecord::Migration
+  def change
+    add_column :posts, :likes_count, :integer, default: 0
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150807130906) do
+ActiveRecord::Schema.define(version: 20150812132728) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -100,6 +100,7 @@ ActiveRecord::Schema.define(version: 20150807130906) do
     t.datetime "created_at",                   null: false
     t.datetime "updated_at",                   null: false
     t.text     "content"
+    t.integer  "likes_count",  default: 0
   end
 
   create_table "share_instances", force: :cascade do |t|

spec/controllers/api/v1/likes_controller_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Api::V1::LikesController, type: :controller do
+
+end

spec/helpers/api/v1/likes_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the Api::V1::LikesHelper. For example:
+#
+# describe Api::V1::LikesHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe Api::V1::LikesHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end