protected function parseString($string, $is_view = false)
    {
        if (is_object($this->model) && (strpos($string,'{{') !== false || strpos($string,'{!!') !== false || $is_view)) {
            $fields = $this->model->getAttributes();
            $relations = $this->model->getRelations();
            $array = array_merge($fields, $relations, ['model'=>$this->model]) ;
            $string = ($is_view) ? view($string, $array) : $this->parser->compileString($string, $array);
        }

        return $string;
    }