class CreateComments < ActiveRecord::Migration def self.up create_table :comments, :force => true do |t| t.column :title, :string, :limit => 50, :default => "" t.column :comment, :string, :default => "" t.column :created_at, :datetime, :null => false t.column :commentable_id, :integer, :default => 0, :null => false t.column :commentable_type, :string, :limit => 15, :default => "", :null => false t.column :user_id, :integer, :default => 0, :null => false end add_index :comments, ["user_id"], :name => "fk_comments_user" end def self.down drop_table :comments end end