doctrine / mongodb-odm

    {

        $mapping = $persistentCollection->getMapping();

        if ($mapping['storeAs'] === ClassMetadataInfo::REFERENCE_STORE_AS_ID) {

            $className = $mapping['targetDocument'];

            $class = $this->dm->getClassMetadata($className);

        }

        foreach ($persistentCollection->getMongoData() as $reference) {

            $id = ClassMetadataInfo::getReferenceId($reference, $mapping['storeAs']);

        foreach ($persistentCollection->getMongoData() as $reference) {

            $id = ClassMetadataInfo::getReferenceId($reference, $mapping['storeAs']);

            if ($mapping['storeAs'] !== ClassMetadataInfo::REFERENCE_STORE_AS_ID) {

                $className = $this->uow->getClassNameForAssociation($mapping, $reference);

                $class = $this->dm->getClassMetadata($className);

            }

            $document = $this->uow->tryGetById($id, $class);