public function roots()
	{
		return $this->model->newQuery()->whereNull( $this->model->getQualifiedParentColumnName() )->orderBy( $this->model->getQualifiedLeftColumnName() )->orderBy( $this->model->getQualifiedRightColumnName() )->orderBy( $this->model->getQualifiedKeyName() )->get();
	}
public function roots()
	{
		return $this->model->newQuery()->whereNull( $this->model->getQualifiedParentColumnName() )->orderBy( $this->model->getQualifiedLeftColumnName() )->orderBy( $this->model->getQualifiedRightColumnName() )->orderBy( $this->model->getQualifiedKeyName() )->get();
	}
public function roots ( ) { return $ this -> model -> newQuery ( ) -> whereNull ( $ this -> model -> getQualifiedParentColumnName ( ) ) -> orderBy ( $ this -> model -> getQualifiedLeftColumnName ( ) ) -> orderBy ( $ this -> model -> getQualifiedRightColumnName ( ) ) -> orderBy ( $ this -> model -> getQualifiedKeyName ( ) ) -> get ( ) ; }
Return all root nodes for the current database table appropiately sorted.

@return Collection
Return all root nodes for the current database table appropiately sorted .