php - 传递的参数（服务）中可捕获的致命错误

Question

我正在尝试构建一个作为服务运行的自定义验证器（主要用于获取实体管理器）。

我关注了文档和一些博客文章，但无法使其正常工作。我有这个错误

    Catchable Fatal Error: Argument 1 passed to 
D\AjaxBundle\Validator\Constraints\SelectTypeValidator::__construct() must implement 
interface Doctrine\Common\Persistence\ObjectManager, none given, called in 
/AJAX/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Validator/ConstraintValidatorFactory.php on line 67 and defined in 
/AJAX/src/D/AjaxBundle/Validator/Constraints/SelectTypeValidator.php line 14

SelectTypeValidator.php

namespace D\AjaxBundle\Validator;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Bridge\Doctrine\RegistryInterface;

use Doctrine\Common\Persistence\ObjectManager;

class SelectTypeValidator extends ConstraintValidator
{
    private $om;

    public function __construct(ObjectManager $om)
    {
        $this->om=$om;
    }

    public function validate($value, Constraint $constraint)
    {
        $fieldOne = $this->om->getRepository('DAjaxBundle:City')->findOneBy(array('id' =>
                $value->getId()));

        if ($fieldOne == null) {
            $this->context->addViolation($constraint->message, array('%string%' => $value->
                    getId()));
        }
    }
}

选择类型.php

namespace D\AjaxBundle\Validator;

use Symfony\Component\Validator;

class SelectType extends Constraint
{
    public $message ='message';

    public function validateBy()
    {
        return 'SelectTypeValidator';
    }

    public function getRequiredOptions() 
    {
        return array();
    }

}

服务.yml

services:
    d_ajax.validator.SelectTypeValidator:
        class: D\AjaxBundle\Validator\SelectTypeValidator
        arguments: [@doctrine.orm.entity_manager]
        tags:
            - { name: validator.constraint_validator, alias: SelectTypeValidator }