protected function save($type)
{
$value = waRequest::post($type);
$product = new shopProduct($this->product_id);
$product->save(array($type => $value));
if ($value != 2) {
$related_model = new shopProductRelatedModel();
$related_model->deleteByField(array('product_id' => $this->product_id, 'type' => $type));
}
}