public function new(Request $request): Response
{
    $category = new Category();
    $form = $this->createForm(CategoryType::class, $category);
    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($category);
        $entityManager->flush();

        return $this->redirectToRoute('category_index');
    }

    return $this->render('category/new.html.twig', [
        'category' => $category,
        'form' => $form->createView(),
    ]);
}