Problem with Multipart/Form-Data Deserialization in API Platform

Title: Problem with Multipart/Form-Data Deserialization in API Platform

Body:

Hello,

I am experiencing an issue with handling multipart/form-data in my Symfony application using API Platform. When I try to add a message with an attached audio file via a form, I get an error indicating that deserialization for the "multipart" format is not supported.

Details of the Issue:

I am attempting to send a message with an audio file using a POST multipart request. Here is the error I encounter:

HttpErrorResponse
error
: {@id: '/api/errors/400', @type: 'hydra:Error', title: 'An error occurred', detail: 'Deserialization for the format "multipart" is not supported.', status: 400, …}


Here are the details of my code:

1. API Platform Configuration (api_platform.yaml):

api_platform:
title: Hello API Platform
version: 1.0.0
formats:
jsonld: ['application/ld+json']
json: ['application/json']
multipart: ['multipart/form-data']
defaults:
stateless: true
cache_headers:
vary: ['Content-Type', 'Authorization', 'Origin']
extra_properties:
standard_put: true
rfc_7807_compliant_errors: true
event_listeners_backward_compatibility_layer: false
keep_legacy_inflector: false


2. Symfony Controller (MessageController.php):

namespace App\Controller;

use App\Entity\Message;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use Doctrine\ORM\EntityManagerInterface;

class MessageController extends AbstractController
{
#[Route('/api/messages', name: 'api_message_create', methods: ['POST'])]
public function create(Request $request, EntityManagerInterface $entityManager): Response
{
$description = $request->request->get('description');
$keywords = $request->request->get('keywords');
$category = $request->request->get('category');

$audioFile = $request->files->get('audioFile');

if ($audioFile) {
$filename = md5(uniqid()) . '.' . $audioFile->guessExtension();
$audioFile->move($this->getParameter('audio_directory'), $filename);

$message = new Message();
$message->setDescription($description);
$message->setKeywords($keywords);
$message->setCategory($category);
$message->setAudioFile($filename);

$entityManager->persist($message);
$entityManager->flush();

return $this->json($message, Response::HTTP_CREATED);
}

return $this->json(['error' => 'No file uploaded'], Response::HTTP_BAD_REQUEST);
}
}


3. Angular Service (MessageService.ts):

addMessage(message: Message, audioFile?: File): Observable<Message> {
const formData: FormData = new FormData();
if (message.description) {
formData.append('description', message.description);
}
if (message.keywords) {
formData.append('keywords', message.keywords);
}
if (message.category?.['@id']) {
formData.append('category', message.category['@id']);
}
if (audioFile) {
formData.append('audioFile', audioFile, audioFile.name);
}

return this.http.post<Message>(this.apiUrl, formData).pipe(
catchError(error => {
console.error('Error adding message:', error);
return throwError(error);
})
);
}


4. Error Received:

Deserialization for the format "multipart" is not supported.

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