credit_card_type.rb

class CreditCardType < ActiveRecord::Base
  acts_as_enumeration :lookup_name
  column :name
  
  def initialize(attributes = nil)
    super
    self.lookup_name ||= name.to_s.gsub(/[^A-Za-z0-9-]/, '').underscore
  end
  
  create :id => 1, :name => 'Visa'
  create :id => 2, :name => 'Mastercard'
  create :id => 3, :name => 'American Express', :lookup_name => 'amex'
  create :id => 4, :name => 'Discover'
end