private function normalizeRelation(PropertyMetadata $propertyMetadata, $relatedObject, string $resourceClass, string $format = null, array $context)
{
if ($propertyMetadata->isReadableLink()) {
return $this->serializer->normalize($relatedObject, $format, $this->createRelationSerializationContext($resourceClass, $context));
}
return $this->iriConverter->getIriFromItem($relatedObject);
}