How to validate if associated Model exists when saving

Suppose I have an 'Order' model associated with the 'Customer' model.

class Order {     var $belongsTo = array('Customer');  }

Is there a standard way in CakePHP to validate if the record pointed to by the customer_id field exists?

$this->Order->create();  $this->Order->set('customer_id', 1);  $this->Order->set('order_date', date('Y-m-d'));  $this->Order->set('total', 100);  $this->Order->save();

Is there a validation rule that can be applied to the customer_id field of the Order model? Or, do I have to define a custom rule?

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