public function removeField($fieldName)
 {
     $fieldIndex = array_search($fieldName, self::$tableFields);
     if ($fieldIndex !== false) {
         unset(self::$tableFields[$fieldIndex]);
         self::$tableFields = array_values(self::$tableFields);
     }
 }
 public function __construct($id = null, $app = null)
 {
     parent::__construct($id, $app);
 }