I have my simple model declared like this:

class Addressbook extends ActiveRecord
{
var $belong_to = array('user');
var $has_many = array('contacts');
}

class Contact extends ActiveRecord
{
var $belong_to = array('addressbook');
}

when I delete an addressbook the model doesn't remove automatically. It sets NULL contacts.addressbook_it (the foreingkey) only.
I want that, besides deletes an addressbook, it deletes the associated contacts too.

Does exists a way to declare the cascade in the model? ...such us this:

ALTER TABLE `contacts`
ADD CONSTRAINT `contacts_ibfk_1` FOREIGN KEY (`addressbook_id`) REFERENCES `addressbooks` (`id`)
ON DELETE CASCADE ON UPDATE CASCADE;