Doctrine\ODM\PHPCR\UnitOfWork::getVersionedNodePath PHP Method

    private function getVersionedNodePath($document)
    {
        $path = $this->getDocumentId($document);
        $metadata = $this->dm->getClassMetadata(get_class($document));
        if (!$metadata->versionable) {
            throw new InvalidArgumentException(sprintf("The document at path '%s' is not versionable", $path));
        }
        $node = $this->session->getNode($path);
        $mixin = $metadata->versionable === 'simple' ? 'mix:simpleVersionable' : 'mix:versionable';
        if (!$node->isNodeType($mixin)) {
            $node->addMixin($mixin);
        }
        return $path;
    }