Data model for "Like"

app/models/asciicast.rb

@@ -9,6 +9,7 @@ class Asciicast < ActiveRecord::Base
 
   belongs_to :user
   has_many :comments, :order => :created_at, :dependent => :destroy
+  has_many :likes, :dependent => :destroy
 
   scope :featured, where(:featured => true)
 

app/models/like.rb

@@ -0,0 +1,4 @@
+class Like < ActiveRecord::Base
+  belongs_to :asciicast, :counter_cache => true
+  belongs_to :user
+end

app/models/user.rb

@@ -1,5 +1,9 @@
 class User < ActiveRecord::Base
 
+  has_many :user_tokens, :dependent => :destroy
+  has_many :asciicasts, :dependent => :destroy
+  has_many :likes, :dependent => :destroy
+
   validates :provider, :presence => true
   validates :uid, :presence => true
   validates :nickname, :presence => true
@@ -8,9 +12,6 @@ class User < ActiveRecord::Base
     :nickname,
     :message => "Sorry, but your nickname is already taken"
 
-  has_many :user_tokens, :dependent => :destroy
-  has_many :asciicasts, :dependent => :destroy
-
   def self.create_with_omniauth(auth)
     user = new
     user.provider   = auth["provider"]

db/migrate/20120406114956_create_likes.rb

@@ -0,0 +1,14 @@
+class CreateLikes < ActiveRecord::Migration
+  def change
+    create_table :likes do |t|
+      t.integer :asciicast_id, :null => false
+      t.integer :user_id, :null => false
+
+      t.timestamps
+    end
+
+    add_index :likes, :asciicast_id
+    add_index :likes, :user_id
+    add_index :likes, [:user_id, :asciicast_id]
+  end
+end

db/migrate/20120406115845_add_likes_count_to_asciicast.rb

@@ -0,0 +1,6 @@
+class AddLikesCountToAsciicast < ActiveRecord::Migration
+  def change
+    add_column :asciicasts, :likes_count, :integer
+    add_index  :asciicasts, :likes_count
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120403165915) do
+ActiveRecord::Schema.define(:version => 20120406115845) do
 
   create_table "asciicasts", :force => true do |t|
     t.integer  "user_id"
@@ -34,10 +34,12 @@ ActiveRecord::Schema.define(:version => 20120403165915) do
     t.text     "description"
     t.boolean  "featured",         :default => false
     t.string   "username"
+    t.integer  "likes_count"
   end
 
   add_index "asciicasts", ["created_at"], :name => "index_asciicasts_on_created_at"
   add_index "asciicasts", ["featured"], :name => "index_asciicasts_on_featured"
+  add_index "asciicasts", ["likes_count"], :name => "index_asciicasts_on_likes_count"
   add_index "asciicasts", ["recorded_at"], :name => "index_asciicasts_on_recorded_at"
   add_index "asciicasts", ["user_id"], :name => "index_asciicasts_on_user_id"
   add_index "asciicasts", ["user_token"], :name => "index_asciicasts_on_user_token"
@@ -53,6 +55,17 @@ ActiveRecord::Schema.define(:version => 20120403165915) do
   add_index "comments", ["asciicast_id"], :name => "index_comments_on_asciicast_id"
   add_index "comments", ["user_id"], :name => "index_comments_on_user_id"
 
+  create_table "likes", :force => true do |t|
+    t.integer  "asciicast_id", :null => false
+    t.integer  "user_id",      :null => false
+    t.datetime "created_at",   :null => false
+    t.datetime "updated_at",   :null => false
+  end
+
+  add_index "likes", ["asciicast_id"], :name => "index_likes_on_asciicast_id"
+  add_index "likes", ["user_id", "asciicast_id"], :name => "index_likes_on_user_id_and_asciicast_id"
+  add_index "likes", ["user_id"], :name => "index_likes_on_user_id"
+
   create_table "user_tokens", :force => true do |t|
     t.integer  "user_id",    :null => false
     t.string   "token",      :null => false

spec/factories/likes.rb

@@ -0,0 +1,8 @@
+# Read about factories at http://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :like do
+    asciicast_id 1
+    user_id 1
+  end
+end

spec/models/like_spec.rb

@@ -0,0 +1,4 @@
+require 'spec_helper'
+
+describe Like do
+end