public function edit(Request $request, Book $book, FileUploader $fileUploader): Response
    {
        $book->setCover(new File($this->getParameter('app_storage').'/'.$book->getCover()));

        exit(var_dump($book->getCover())); // Object

        $form = $this->createForm(BookEditType::class, $book);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {

            exit(var_dump($book->getCover())); // NULL
            $file = $book->getCover();

            $fileName = $fileUploader->upload($file);

            $book->setCover($fileName);

            $this->getDoctrine()->getManager()->flush();

            return $this->redirectToRoute('dashboard_book_view', ['id' => $book->getId()]);
        }

        return $this->render('dashboard/book/edit.html.twig', [
            'book' => $book,
            'editForm' => $form->createView(),
        ]);
    }