public function getBy($field, $cond = UNDEFINED, $value = UNDEFINED)
    {
        $data = $this->data;
        $id = $this->id;

        $this->tryLoadBy($field, $cond, $value);
        $row = $this->data;

        $this->data = $data;
        $this->id = $id;

        return $row;
    }