Baum\Node::allLeaves PHP Метод

    public static function allLeaves()
    {
        $instance = new static();
        $grammar = $instance->getConnection()->getQueryGrammar();
        $rgtCol = $grammar->wrap($instance->getQualifiedRightColumnName());
        $lftCol = $grammar->wrap($instance->getQualifiedLeftColumnName());
        return $instance->newQuery()->whereRaw($rgtCol . ' - ' . $lftCol . ' = 1')->orderBy($instance->getQualifiedOrderColumnName());
    }