Doctrine\ODM\PHPCR\UnitOfWork::cascadeMergeCollection PHP Метод

    private function cascadeMergeCollection($managedCol, array $mapping)
    {
        if (!$managedCol instanceof PersistentCollection || !($mapping['cascade'] & ClassMetadata::CASCADE_MERGE)) {
            return;
        }
        $managedCol->initialize();
        if (!$managedCol->isEmpty()) {
            $managedCol->unwrap()->clear();
            $managedCol->setDirty(true);
        }
    }