doctrine / orm

        if ($class->isIdentifierComposite) {

            $idHash = '';

            foreach ($class->identifier as $fieldName) {

                $idHash .= ' ' . (isset($class->associationMappings[$fieldName])

                    ? $data[$class->associationMappings[$fieldName]['joinColumns'][0]['name']]

                    : $data[$fieldName]);

            }

            return $this->_uow->tryGetByIdHash(ltrim($idHash), $class->rootEntityName);

        } else if (isset($class->associationMappings[$class->identifier[0]])) {

        if ($class->isIdentifierComposite) {

            $id = [];

            foreach ($class->identifier as $fieldName) {

                $id[$fieldName] = isset($class->associationMappings[$fieldName])

                    ? $data[$class->associationMappings[$fieldName]['joinColumns'][0]['name']]

                    : $data[$fieldName];

            }

        } else {

            $fieldName = $class->identifier[0];

            $id        = [