/**
* Fixes the tree based on parentage info.
*
* Nodes with invalid parent are saved as roots.
*
* @return int The number of fixed nodes
*/
public function fixTree()
{
$columns = [$this->model->getKeyName(), $this->model->getParentIdName(), $this->model->getLftName(), $this->model->getRgtName()];
$dictionary = $this->model->newNestedSetQuery()->defaultOrder()->get($columns)->groupBy($this->model->getParentIdName())->all();
return self::fixNodes($dictionary);
}
