public function makeRootIfNotExist()
{
$root = $this->getRoot();
if (!$root) {
$root = new Comment();
$root->model_name = $this->model_name;
$root->model_id = $this->model_id;
$root->content = 'root';
$root->name = 'root';
$root->makeRoot();
}
return $root;
}
