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

    private function cascadeScheduleParentInsert($class, $document, &$visited)
    {
        if ($class->parentMapping) {
            $parent = $class->reflFields[$class->parentMapping]->getValue($document);
            if ($parent !== null && $this->getDocumentState($parent) === self::STATE_NEW) {
                if (!is_object($parent)) {
                    throw new PHPCRException(sprintf('A parent field may only contain mapped documents, found <%s> in field "%s" of "%s"', gettype($parent), $class->parentMapping, self::objToStr($document, $this->dm)));
                }
                $this->doScheduleInsert($parent, $visited);
            }
        }
    }