What is the best way to update an Entity whitout form, FosRest - rest

Question

I'm currently build an API with FosRestBundle. I search how can i make a reusable and optimize service for update my entities.
For now, in my controller i get two entites with paramConverter :
/**
* #Rest\Put("/enseignes/{enseigne_id}",
* requirements={"id" = "\d+"})
*#ParamConverter("enseigne", options={"id":"enseigne_id"})
*#ParamConverter("enseigneUpdate",
* converter="fos_rest.request_body")
*
* #Rest\View()
*/
public function updateEnseigneAction(Enseigne $enseigne,Enseigne $enseigneUpdate, ConstraintViolationList $violations)
{
if (count($violations)){
return $this->view($violations,Response::HTTP_BAD_REQUEST);
}
$mapData = $this->get('app.mapdata');
$mapData->mapDataOnEntity($enseigneUpdate,$enseigne);
$em = $this->getDoctrine()->getManager();
$em->flush();
return $enseigne;
}
So, one entity currently in my bdd with id parameter (and check if the id exist ), and another one who is validate with the converter of fosRest. GOOD
My service look like :
class MapData {
private $propertyMetadata;
private $serializer;
function __construct(MetadataFactory $metadataFactory,Serializer $serializer)
{
$this->propertyMetadata = $metadataFactory;
$this->serializer = $serializer;
}
public function mapDataOnEntity($entityUpdate, $targetEntity)
{
if (get_class($entityUpdate) != get_class($targetEntity)){
throw new BadRequestHttpException('Entity doesnt match');
}
$this->fillProperties($targetEntity,$entityUpdate );
}
/**
*
* #param object $targetEntity
* #param object $entityUpdate
*/
protected function fillProperties($targetEntity, $entityUpdate)
{
$propertyAccessor = new PropertyAccessor();
$reflectorTargetEntity = new \ReflectionClass($entityUpdate);
// dump($classAnnotaions);die();
// Recupere les propriétés de targetEntity
$properties = $reflectorTargetEntity->getProperties();
// dump($properties);die();
foreach ($properties as $property){
if ($property->getName() != 'id'){
$newValue = $propertyAccessor->getValue($entityUpdate,$property->getName());
$propertyAccessor->setValue($targetEntity,$property->getName(),$newValue);
}
}
}
}
First :
In the properties of my class i have the properties of relation with other entities and i don't want it !
Second:
How i can use this code for manage the PATCH too ? And what do you think about this solution ?