single table inheritance , how to alias the id key name ?

I have a model class Person < ActiveRecord::Base
and 2 classes inheriting from it
class User < Person and class Contact < Person

obviously the id is
but is there anyway to use and or should I
always use ???

thanks for your suggestions


Your question doesn't really make a huge amount of sent. If foo is an instance of person, user, contact (or any other AR model for that matter) the gives you the primary key