Symfony 表单验证

我输入 123 - 我得到 它不能为空！
我输入 123a - 我得到此值无效。

本质：

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * User
 *
 * @ORM\Table(name="user")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\UserRepository")
 */
class User
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var int
     *
     * @ORM\Column(name="intfield", type="integer")
     * @Assert\NotBlank(
     *     message="Не может быть пустым!"
     * )
     * @Assert\Type(
     *     type="int",
     *     message="Должно быть число!"
     * )
     *
     */
    private $intfield;
...

控制器和表单创建：

    /**
     *
     * @Route(
     *     "/register"
     * )
     * @param Request $request
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function registerAction(Request $request)
    {
        $user = new User();

        $form = $this->createFormBuilder($user)
            ->add('intfield', TextType::class, [
                'required' => false
            ])
            ->add('save', SubmitType::class)
            ->getForm();

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            //...
        }

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