public function getType()
 {
     $type_id = waRequest::post('type_id', null, waRequest::TYPE_INT);
     if (!$type_id) {
         return null;
     } else {
         $types = shopTypeModel::extractAllowed(array($type_id));
         if (!$types) {
             return null;
         } else {
             return $type_id;
         }
     }
 }