rosa-build/db/migrate/20120418100619_add_token_authenticatable_to_users.rb

class AddTokenAuthenticatableToUsers < ActiveRecord::Migration
  def self.up
    add_column :users, :authentication_token, :string
    add_index :users, :authentication_token

    User.all.each do |user|
      user.ensure_authentication_token!
    end
  end

  def self.down
    remove_column :users, :authentication_token
  end
end