public function makeRoot($newRoot)
    {
        if($this->isRoot())
        {
            return;
        }

        if(!$this->hasManyRoots())
        {
            throw new \BadMethodCallException(sprintf('%s::%s is only supported on multiple root trees', __CLASS__, __METHOD__));
        }

        $em = $this->getManager()->getEntityManager();
        $lftField = $this->getLeftFieldName();
        $rgtField = $this->getRightFieldName();
        $rootField = $this->getRootFieldName();

        $oldRgt = $this->getRightValue();
        $oldLft = $this->getLeftValue();
        $oldRoot = $this->getRootValue();

        // beginTransaction
        $em->getConnection()->beginTransaction();
        try
        {
            // Update descendants lft/rgt/root values
           $diff = 1 - $oldLft;
            $qb = $em->createQueryBuilder()
                ->update(get_class($this->getNode()), 'n')
                ->set("n.$lftField", "n.$lftField + ?1")
                ->setParameter(1, $diff)
                ->set("n.$rgtField", "n.$rgtField + ?2")
                ->setParameter(2, $diff)
                ->set("n.$rootField", "?3")
                ->setParameter(3, $newRoot)
                ->where("n.$lftField > ?4")
                ->setParameter(4, $oldLft)
                ->andWhere("n.$rgtField < ?5")
                ->setParameter(5, $oldRgt)
                ->andWhere("n.$rootField = ?6")
                ->setParameter(6, $oldRoot);
            $qb->getQuery()->execute();
            $this->getManager()->updateValues($oldLft, $oldRgt, $diff, $oldRoot, $newRoot);

            // Close gap in old tree
            $first = $oldRgt + 1;
            $delta = $oldLft - $oldRgt - 1;
            $this->shiftRLRange($first, 0, $delta, $oldRoot);

            // Set new lft/rgt/root values for root node
            $this->setLeftValue(1);
            $this->setRightValue($oldRgt - $oldLft + 1);
            $this->setRootValue($newRoot);
            $em->persist($this->getNode());

            $em->flush();
            $em->getConnection()->commit();
        }
        catch (\Exception $e)
        {
            // @codeCoverageIgnoreStart
            $em->close();
            $em->getConnection()->rollback();
            throw $e;
            // @codeCoverageIgnoreEnd
        }
        // endTransaction
    }