为什么我收到“此值应为字符串类型"?在Symfony 5上使用DateTime约束时? [英] Why do I receive "This value should be of type string" when using a DateTime constraint on Symfony 5?

问题描述

我有以下实体(仅附有相关部分):

I have the following entity (only attached the relevant parts):

use ApiPlatform\Core\Annotation\ApiResource;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @ApiResource(mercure=true)
 * @ORM\Entity(repositoryClass="App\Repository\EventRepository")
 */
class Event {
    /**
     * @ORM\Column(type="datetime")
     * @Assert\DateTime
     * @Assert\NotNull
     */
    private $createdAt;

    public function __construct() {
        $this->createdAt = new \DateTime();
    }

    public function getCreatedAt(): ?\DateTimeInterface {
        return $this->createdAt;
    }

    public function setCreatedAt(\DateTimeInterface $createdAt): self {
        $this->createdAt = $createdAt;
        return $this;
    }
}

其存储库:

class EventRepository extends ServiceEntityRepository {
    public function __construct(ManagerRegistry $registry) {
        parent::__construct($registry, Event::class);
    }
}

在创建到事件端点的POST请求时(通过Postman或Swagger UI)，该请求失败，并带有以下异常:

When creating a POST request to the event endpoint (via Postman or the Swagger UI), it fails with the following exception:

推荐答案

您使用了错误的断言.

Date 期望字符串或可以转换为字符串的对象.而DateTimeInterface都不是.

您应该使用Type 约束.

/**
 * @Assert\Type("\DateTimeInterface")
 */
 private $createdAt;

Symfony 4.2和Assert\Date验证DateTime对象的功能.在Symfony 5.0上，它已被完全删除.

The ability to use Assert\Date to validate DateTime objects was deprecated on Symfony 4.2, and on Symfony 5.0 it was removed altogether.

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