public function getFieldName(Clazz $clazz, $fieldId)
 {
     while ($clazz != null) {
         if ($clazz->hasField($fieldId)) {
             return (object) array('class' => $clazz, 'fieldName' => $fieldId);
         }
         $clazz = $clazz->getSuperClass();
     }
     return null;
     //return (object) array('class' => $clazz, 'fieldName' => $fieldId);
 }