使用symfony2是否可以使用约束验证器服务来验证属性

Question

>我遵循了以下Symfony2食谱教程，但我不断收到错误

constraint myContraintClass cannot be put on properties or getters

在验证中，我有

CoreEntityActivity:
  properties:
    maxTotalParticipant:
      - ApplicationActivityBundleValidatorActivityMaxTotalParticipant: ~

这是我的约束

<?php
namespace ApplicationActivityBundleValidator;
use SymfonyComponentValidatorConstraint;
/**
 * @Annotation
 */
class ActivityMaxTotalParticipant extends Constraint
{
  public $message = 'trigger error';
  public function validatedBy() {
    return 'activity_max_total_participant_validator';
  }
  public function getTargets() {
    return self::CLASS_CONSTRAINT;
  }
  public function getMessage() {
    return $this->message;
  }
}

和我的约束验证器

<?php 
 namespace ApplicationActivityBundleValidator;
 use SymfonyComponentValidatorExecutionContext;
 use SymfonyBundleDoctrineBundleRegistry;
 use myAppCoreEntityActivity;
 use SymfonyComponentValidatorConstraint;
 use SymfonyComponentValidatorConstraintValidator;
 use SymfonyComponentTranslationTranslator;
 use SymfonyComponentTranslation;
 class ActivityMaxTotalParticipantValidator extends ConstraintValidator
 {
    private $doctrine;
    private $translator;
    public function __construct(Registry $doctrine, Translator $translator){
        $this->doctrine = $doctrine;
        $this->translator = $translator;
    }
    /**
     * @param : $value {Activity object}
     * @param : $constraint {ActivityMaxTotalParticipant object}
     * */
    public function isValid( $value, Constraint $constraint) {
      if($value->getId() !== null) { return true; }
      return false;
    }
    private function isMaxTotalParticipantGreaterThanActualParticipants(Activity $activity, ExecutionContext $context){
      $activityUser = $this->doctrine->getEntityManagerForClass('myAppCoreEntityActivityUser')->getRepository('myAppCoreEntityActivityUser')->countNumberParticipantByActivityId($value->getId());
      if($activityUser > $activity->getMaxTotalParticipant() && $activity->getMaxTotalParticipant() !== null) {
        $propertyPath = $this->context->getPropertyPath().'.maxTotalParticipant';
        $this->context->setPropertyPath($propertyPath);
        $this->context->addViolation($constraint->message, array(), null);
        return false;
      }
      return true;
   }
   private function isMaxTotalParticipantGreaterEqualOne(Activity $activity, ExecutionContext $context)
   {
     $maxTotalParticipant = $activity->getMaxTotalParticipant();
     if ($activity->getNumberOfPlacesLimited() == 1 && ($maxTotalParticipant == null || trim($maxTotalParticipant) == '' || $maxTotalParticipant < 1) )  {           
            return false;
     }
     return true;
   }
}

Answer 1

您应该将 getTargets() 的返回值更改为 self::PROPERTY_CONSTRAINT 。现在它是self::CLASS_CONSTRAINT，这意味着约束只能放在类级别，而不能放在属性级别（例如，在您的情况下属性$maxTotalParticipant）。