class AnswerController extends FOSRestController
{

    private $data;

    /**
     * @param mixed $data
     */
    public function setData($data): void
    {
        $this->data = $data;
    }

     /**
     * @Rest\Post("/answer")
     */
    public function postAnswerAction(Request $request)
    {
        if ($request->request->count() > 0 && $request->files->count() > 0)
            $this->setData(array_replace_recursive(
                $request->request->all(),
                $request->files->all()
            ));
        else
            $this->setData($request->request->all() ?: $request->files->all());

        $batchSize = 20;
        $i = 1; foreach($this->getData() as $item) { ++$i;
            $serializer = SerializerBuilder::create()
                ->configureHandlers(function (HandlerRegistry $registry) {
                    $registry->registerSubscribingHandler(new UserHandler($this->entityManager));
                    $registry->registerSubscribingHandler(new OptionsHandler($this->entityManager));
                    $registry->registerSubscribingHandler(new QuestionHandler($this->entityManager));
                })
                ->addDefaultHandlers()
                ->build();
            $object = $serializer->deserialize(json_encode($item), Answer::class, 'json');
            $this->entityManager->persist($object);

            if (($i % $batchSize) === 0) {
                $this->entityManager->flush();
                $this->entityManager->clear();
            }
        }
        $this->entityManager->flush();
        $this->entityManager->clear();

        return $this->handleView($this->view($this->getData(), Response::HTTP_CREATED, ['Access-Control-Allow-Origin' => '*']));
    }
}