アイデアとコメントにLikeボタンの追加

app/assets/javascripts/likes.js.coffee

@@ -0,0 +1,22 @@
+$ ->
+  $('.btn_like_idea').click ->
+    $(@).attr('disabled', '')
+    likable_id = $(@).attr("name").match(/^like_button_idea([0-9]+)/)[1]
+    url = '/likes/ideas/' + likable_id + '.json'
+    $.getJSON url, (json) ->
+      if json.status
+        button_name = 'like_button_idea' + json.likable_id
+        $("button[name='" + button_name + "']").each ->
+          $(@).removeAttr('disabled')
+          $(@).find('.like_count').text(json.count)
+
+  $('.btn_like_comment').click ->
+    $(@).attr('disabled', '')
+    likable_id = $(@).attr("name").match(/^like_button_comment([0-9]+)/)[1]
+    url = '/likes/comments/' + likable_id + '.json'
+    $.getJSON url, (json) ->
+      if json.status
+        button_name = 'like_button_comment' + json.likable_id
+        $("button[name='" + button_name + "']").each ->
+          $(@).removeAttr('disabled')
+          $(@).find('.like_count').text(json.count)

app/controllers/likes_controller.rb

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+class LikesController < ApplicationController
+  before_action :authenticate, except: :show
+
+  def idea
+    @idea = Idea.find(params[:likable_id])
+    if current_user
+      @current_user_like = @idea.like(current_user)
+    end
+  end
+
+  def comment
+    @comment = Comment.find(params[:likable_id])
+    if current_user
+      @current_user_like = @comment.like(current_user)
+    end
+  end
+end

app/models/comment.rb

@@ -1,4 +1,6 @@
 class Comment < ActiveRecord::Base
+  include Liking
+
   belongs_to :idea
   belongs_to :user
 

app/models/concerns/liking.rb

@@ -0,0 +1,21 @@
+module Liking
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :likes, as: :likable
+
+    def like_count
+      self.likes.active.count
+    end
+
+    def like(user)
+      user_like = self.likes.find_by(user: user)
+      if user_like
+        user_like.toggle!
+      else
+        user_like = self.likes.create(user: user)
+      end
+      user_like
+    end
+  end
+end

app/models/idea.rb

@@ -1,4 +1,6 @@
 class Idea < ActiveRecord::Base
+  include Liking
+
   has_many :comments
   belongs_to :user
 

app/models/like.rb

@@ -0,0 +1,11 @@
+class Like < ActiveRecord::Base
+  belongs_to :likable, polymorphic: true
+  belongs_to :user
+
+  scope :active, -> { where(deleted: false) }
+
+  def toggle!
+    self.deleted = self.deleted ? false : true
+    self.save!
+  end
+end

app/models/user.rb

@@ -1,5 +1,6 @@
 class User < ActiveRecord::Base
   has_many :ideas
+  has_many :likes
 
   def self.find_or_create_from_auth_hash(auth_hash)
     provider = auth_hash[:provider]

app/views/ideas/show.html.haml

@@ -1,5 +1,9 @@
 %h1
   = @idea.title
+  = button_tag name: "like_button_idea#{@idea.id}", class: "btn_like_idea btn pull-right" do
+    %span.glyphicon.glyphicon-thumbs-up
+    %span.like_count
+      = @idea.like_count
 
 %hr
 
@@ -12,6 +16,12 @@
           = comment.body
         - else
           = comment.body
+
+        = button_tag name: "like_button_comment#{comment.id}", class: "btn_like_comment btn pull-right" do
+          %span.glyphicon.glyphicon-thumbs-up
+          %span.like_count
+            = comment.like_count
+
 - if logged_in?
   = form_for [@idea, @comment] do |f|
     - if @comment.errors.any?

app/views/likes/comment.json.jbuilder

@@ -0,0 +1,7 @@
+json.count @comment.like_count
+if @current_user_like
+  json.(@current_user_like, :likable_id, :id, :created_at, :updated_at)
+  json.status true
+else
+  json.status false
+end

app/views/likes/idea.json.jbuilder

@@ -0,0 +1,7 @@
+json.count @idea.like_count
+if @current_user_like
+  json.(@current_user_like, :likable_id, :id, :created_at, :updated_at)
+  json.status true
+else
+  json.status false
+end

app/views/welcome/index.html.haml

@@ -29,3 +29,8 @@
           = idea.title
         - else
           = idea.title
+
+      = button_tag name: "like_button_idea#{idea.id}", class: "btn_like_idea btn pull-right" do
+        %span.glyphicon.glyphicon-thumbs-up
+        %span.like_count
+          = idea.like_count

config/routes.rb

@@ -8,5 +8,10 @@
     resources :comments, only: :create
   end
 
+  scope :likes do
+    get 'ideas/:likable_id' => 'likes#idea'
+    get 'comments/:likable_id' => 'likes#comment'
+  end
+
   match '*path' => 'application#error404', via: :all
 end

db/migrate/20140517034628_create_likes.rb

@@ -0,0 +1,14 @@
+class CreateLikes < ActiveRecord::Migration
+  def change
+    create_table :likes do |t|
+      t.string  :likable_type, null: false
+      t.integer :likable_id, null: false
+      t.integer :user_id, null: false
+      t.boolean :deleted, null: false, default: false
+
+      t.timestamps
+    end
+
+    add_index :likes, [:likable_type, :user_id]
+  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: 20140427143623) do
+ActiveRecord::Schema.define(version: 20140517034628) do
 
   create_table "comments", force: true do |t|
     t.integer  "idea_id"
@@ -33,6 +33,17 @@
 
   add_index "ideas", ["user_id"], name: "index_ideas_on_user_id"
 
+  create_table "likes", force: true do |t|
+    t.string   "likable_type",                 null: false
+    t.integer  "likable_id",                   null: false
+    t.integer  "user_id",                      null: false
+    t.boolean  "deleted",      default: false, null: false
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "likes", ["likable_type", "user_id"], name: "index_likes_on_likable_type_and_user_id"
+
   create_table "users", force: true do |t|
     t.string   "provider",   null: false
     t.string   "uid",        null: false

spec/factories/likes.rb

@@ -0,0 +1,6 @@
+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :like do
+  end
+end

spec/models/like_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe Like do
+  pending "add some examples to (or delete) #{__FILE__}"
+end