Baum\Node::setDefaultLeftAndRight PHP Метод

    public function setDefaultLeftAndRight()
    {
        $withHighestRight = $this->newNestedSetQuery()->reOrderBy($this->getRightColumnName(), 'desc')->take(1)->sharedLock()->first();
        $maxRgt = 0;
        if (!is_null($withHighestRight)) {
            $maxRgt = $withHighestRight->getRight();
        }
        $this->setAttribute($this->getLeftColumnName(), $maxRgt + 1);
        $this->setAttribute($this->getRightColumnName(), $maxRgt + 2);
    }