public function model_before_check(Model_Purchase $purchase, Jam_Event_Data $data)
{
if ($purchase->shipping_required) {
if ($purchase->shipping_same_as_billing and !$purchase->billing_address) {
$purchase->errors()->add('billing_address', 'present');
} elseif (!$purchase->shipping_same_as_billing and !$purchase->shipping_address) {
$purchase->errors()->add('shipping_address', 'present');
} else {
$purchase->shipping_address()->fields_required = TRUE;
}
if ($purchase->items_count(array('can_ship' => FALSE))) {
$purchase->errors()->add('brand_purchases', 'cannot_ship');
}
}
}
