/**
* Serializes a relationship value
*
* @param Model $owner
* @param Model|Model[]|null $relationship
* @param RelationshipMetadata $relMeta
* @param AdapterInterface $adapter
* @return array
*/
protected function serializeRelationship(Model $owner, $relationship = null, RelationshipMetadata $relMeta, AdapterInterface $adapter)
{
if ($relMeta->isOne()) {
if (is_array($relationship)) {
throw SerializerException::badRequest('Invalid relationship value.');
}
$serialized = $this->serializeHasOne($owner, $relationship, $adapter);
} elseif (is_array($relationship) || null === $relationship) {
$serialized = $this->serializeHasMany($owner, $relationship, $adapter);
} else {
throw SerializerException::badRequest('Invalid relationship value.');
}
$ownerMeta = $owner->getMetadata();
$serialized['links'] = ['self' => $adapter->buildUrl($ownerMeta, $owner->getId(), $relMeta->getKey()), 'related' => $adapter->buildUrl($ownerMeta, $owner->getId(), $relMeta->getKey(), true)];
return $serialized;
}
