public function __isset($name)
    {
        try {
            return $this->$name !== null;
        } catch (MemberAccessException $e) {
            return false;
        } catch (LeanMapperException $e) {
            if ($this->isDetached() and $e->getCode() === Result::ERROR_MISSING_COLUMN) {
                return false;
            }
            throw $e;
        }
    }