rosa-build/db/migrate/20120127141211_add_confirmable_to_users.rb

class AddConfirmableToUsers < ActiveRecord::Migration
  def self.up
    add_column :users, :confirmation_token,   :string
    add_column :users, :confirmed_at,         :datetime
    add_column :users, :confirmation_sent_at, :datetime
    add_index  :users, :confirmation_token,   unique: true
  end

  def self.down
    remove_index  :users, :confirmation_token
    remove_column :users, :confirmation_sent_at
    remove_column :users, :confirmed_at
    remove_column :users, :confirmation_token
  end
end