<?php 
class Thingy extends AppModel {

	var $name = 'Thingy';

	var $hasMany = array(
		'Note' => array(
			'className' => 'Note',	
			'foreignKey' => 'foreign_id',
			'conditions' => array('Note.class' => 'Thingy'),
			'dependent' => true
		)
	);
}
?>