static function validateStockAvatar($parameters)
 {
     return isset($parameters[Stock::AVATAR_FIELD]) && ValidateHelper::validateFileField($parameters[Stock::AVATAR_FIELD]);
 }
 static function validateOrphanageAvatar($parameters)
 {
     return isset($parameters[Orphanage::AVATAR_FIELD]) && ValidateHelper::validateFileField($parameters[Orphanage::AVATAR_FIELD]);
 }