1class ActsAsCommentableWithThreadingMigration < ActiveRecord::Migration
 2  def self.up
 3    create_table :comments, :force => true do |t|
 4      t.integer :commentable_id, :default => 0
 5      t.string :commentable_type, :default => ""
 6      t.string :title, :default => ""
 7      t.text :body, :default => ""
 8      t.string :subject, :default => ""
 9      t.integer :user_id, :default => 0, :null => false
10      t.integer :parent_id, :lft, :rgt
11      t.timestamps
12    end
13    
14    add_index :comments, :user_id
15    add_index :comments, :commentable_id
16  end
17  
18  def self.down
19    drop_table :comments
20  end
21end