public function getNormalizedIdentifier($model)
    {
        $identifier = $this->baseModelManager->getNormalizedIdentifier($model);

        if ($identifier === null) {
            $identifierName = is_array($this->getModelIdentifier(get_class($model))) ? current($this->getModelIdentifier(get_class($model))) : $this->getModelIdentifier(get_class($model));

            return $model->{'get'.ucfirst($identifierName)}();
        }

        return $identifier;
    }