model/customer.php

<?php
class Customer extends AppModel {

	var $name = 'Customer';
	var $actsAs = array('Containable');
	var $validate = array(
		'number' => array('notempty'),
		'name' => array('notempty')
	);

	//The Associations below have been created with all possible keys, those that are not needed can be removed
	var $hasMany = array(
		'Contact' => array(
			'className' => 'Contact',
			'foreignKey' => 'customer_id',
			'dependent' => false,
			'conditions' => '',
			'fields' => '',
			'order' => '',
			'limit' => '',
			'offset' => '',
			'exclusive' => '',
			'finderQuery' => '',
			'counterQuery' => ''
		),
		'Serial' => array(
			'className' => 'Serial',
			'foreignKey' => 'customer_id',
			'dependent' => false,
			'conditions' => '',
			'fields' => '',
			'order' => '',
			'limit' => '',
			'offset' => '',
			'exclusive' => '',
			'finderQuery' => '',
			'counterQuery' => ''
		)
	);

}
?>