当使用ajax时，symfony4.3不能在控制器中使用ValidatorInterface

use Symfony\Component\Validator\Validator\ValidatorInterface;

class MyController extends AbstractController
{
    private $validator;

    public function __construct(ValidatorInterface $validator)
    {
        $this->validator = $validator;
    }

    public function myAction(Request $request)
    {
        // 从请求中获取需要验证的数据
        $data = $request->request->all();

        // 使用ValidatorInterface进行数据验证
        $violations = $this->validator->validate($data);

        if (count($violations) > 0) {
            // 数据验证失败，处理错误信息
            $errors = [];
            foreach ($violations as $violation) {
                $errors[] = $violation->getMessage();
            }

            // 返回错误信息给前端
            return new JsonResponse(['errors' => $errors], 400);
        }

        // 数据验证通过，继续处理其他逻辑
        // ...

        // 返回响应给前端
        return new JsonResponse(['message' => 'Success']);
    }
}