symfony:如何传递给上传的捆绑包自己的路径

framework:
    # ...
    file_uploads:
        upload_destination: '%kernel.project_dir%/public/uploads'

use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\HttpFoundation\Request;

// ...

public function uploadAction(Request $request)
{
    $form = $this->createFormBuilder()
        ->add('file', FileType::class)
        ->add('submit', SubmitType::class, ['label' => 'Upload'])
        ->getForm();

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        $file = $form->get('file')->getData();
        $fileName = md5(uniqid()).'.'.$file->guessExtension();

        // Move the file to the desired location
        $file->move(
            $this->getParameter('upload_destination'),
            $fileName
        );

        // ...
    }

    // ...
}