带有参数的Symfony3自定义验证约束引发异常

我一直在尝试使用Symfony3上的服务创建一个带有参数的自定义验证约束。

问题是，我在提交表格后遇到了一个异常：

Catchable Fatal Error: Argument 1 passed to OC'PlatformBundle'Validator'AntifloodValidator::__construct() must be an instance of Symfony'Component'HttpFoundation'RequestStack, none given, called in C:'wamp'www'Symfony'vendor'symfony'symfony'src'Symfony'Bundle'FrameworkBundle'Validator'ConstraintValidatorFactory.php on line 71 and defined

我知道Symfony无法使用services.yml.中给出的参数对AntifloodValidator的构造函数进行水合

这是我的代码：

服务中。yml:

oc_platform.validator.antiflood:
        class: OC'PlatformBundle'Validator'AntifloodValidator
        arguments: ['@request_stack', '@doctrine.orm.entity_manager']
        tags:
            - { name: validator.constraint_validator, alias: oc_platform_antiflood }

在Antiflood.php中：

namespace OC'PlatformBundle'Validator;
use Symfony'Component'Validator'Constraint;
/**
 * @Annotation
 */
class Antiflood extends Constraint
{
  public $message = "Vous avez déjà posté un message il y a moins de 15 secondes, merci d'attendre un peu.";
  public function validateBy()
  {
    return 'oc_platform_antiflood'; // Ici, on fait appel à l'alias du service
  }
}

在AntifloodValidator.php中：

namespace OC'PlatformBundle'Validator;
use Doctrine'ORM'EntityManagerInterface;
use Symfony'Component'HttpFoundation'RequestStack;
use Symfony'Component'Validator'Constraint;
use Symfony'Component'Validator'ConstraintValidator;
class AntifloodValidator extends ConstraintValidator
{
  private $requestStack;
  private $em;
  // Les arguments déclarés dans la définition du service arrivent au constructeur
  // On doit les enregistrer dans l'objet pour pouvoir s'en resservir dans la méthode validate()
  public function __construct(RequestStack $requestStack, EntityManagerInterface $em)
  {
    $this->requestStack = $requestStack;
    $this->em           = $em;
  }
  public function validate($value, Constraint $constraint)
  {
   ...

在Advert.php（我的实体）：

namespace OC'PlatformBundle'Entity;
use Doctrine'Common'Collections'ArrayCollection;
use Doctrine'ORM'Mapping as ORM;
use Gedmo'Mapping'Annotation as Gedmo;
use Symfony'Component'Validator'Constraints as Assert;
use Symfony'Bridge'Doctrine'Validator'Constraints'UniqueEntity;
use Symfony'Component'Validator'Context'ExecutionContextInterface;
use OC'PlatformBundle'Validator as CustomAssert;
/**
 * Advert
 * 
 * @ORM'Table(name="advert")
 * @ORM'Entity(repositoryClass="OC'PlatformBundle'Repository'AdvertRepository")
 * @ORM'HasLifecycleCallbacks()
 * @UniqueEntity(fields="title", message="Une annonce existe déjà avec ce titre.")
 */
class Advert
{
  /**
   * @ORM'Column(name="id", type="integer")
   * @ORM'Id
   * @ORM'GeneratedValue(strategy="AUTO")
   */
  private $id;
  /**
   * @ORM'Column(name="date", type="datetime")
   * @Assert'DateTime()
   */
  private $date;
  /**
   * @ORM'Column(name="title", type="string", length=255, unique=false)
   * @Assert'Length(min=10)
   */
  private $title;
  /**
   * @ORM'Column(name="author", type="string", length=255)
   * @Assert'Length(min=2)
   */
  private $author;
  /**
   * @ORM'Column(name="content", type="text")
   * @Assert'NotBlank()
   * @CustomAssert'Antiflood
   */
  private $content;

In多次查看文档，但没有发现任何内容。stackoverflow也是如此。

知道吗？