public function saveAs($model)
    {
        if (is_string($model)) {
            $model = $this->app->normalizeClassName($model, 'Model');
            $model = $this->add($model);
        }
        $this->_save_as = $model;
        $res = $this->save();
        $this->_save_as = null;

        return $res;
    }