/**
* If there is a new value in promo_code_text, try to load promo_code object.
* If the new value is NULL, remove it
* @param Model_Purchase $purchase
*/
public function model_after_check(Model_Purchase $purchase)
{
if ($purchase->changed('promo_code_text') and !$purchase->errors('promo_code_text')) {
if ($purchase->promo_code_text) {
$purchase->promo_code = Jam::find('promo_code', $purchase->promo_code_text);
} else {
$purchase->promo_code = NULL;
}
}
}
