ConstraintViolationListInterface 到 Symfony 中的异常

ConstraintViolationListInterface to Exception in Symfony

我需要将 ConstraintViolationListInterface 类型的对象转换为单个异常以进行进一步记录,其中消息是来自列表中每个约束违规的消息的串联,当验证失败时。

显然,我无法在使用验证的每个包中重复 foreach 循环来实现此目的,因此我正在考虑再创建一个包,以提供接受 ConstraintViolationListInterface 并返回单个异常的简单服务。 Symfony 中是否有针对此的标准解决方案?我需要写这个服务似乎很奇怪,这个问题对我来说似乎很常见。

也许你可以像这样创建一个 ConstraintViolationsEvent :

namespace AppBundle\Event;

use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\Validator\ConstraintViolationListInterface;

/**  
 * The order.placed event is dispatched each time an order is created
 * in the system.
 */
class ConstraintViolationsEvent extends Event
{
    const VIOLATIONS_DETECTED = 'constraint_violations.detected';

    protected $constraintViolationList;

    public function __construct(ConstraintViolationListInterface $constraintViolationList)
    {
        $this->constraintViolationList = $constraintViolationList;
    }

    public function getConstraintViolationList()
    {
        return $this->constraintViolationList;
    }
}

然后您可以为此事件创建一个侦听器,并在该侦听器中,根据发现的所有违规情况创建您的异常。每次你会发现违规行为时,你只需像这样在你的控制器中发送你的事件:

class MyController extends Controller
{
    public function myFormAction(Request $request)
    {
        /** handle the request, get the form data, validate the form...etc. **/
        $event = new ConstraintViolationsEvent($constraintViolationList);
        $dispatcher->dispatch(ConstraintViolationsEvent::VIOLATIONS_DETECTED, $event);
    }
}

事实上,您可以在服务中管理异常的创建并在侦听器中调用服务。由你决定。

我也很惊讶 symfony 对此没有任何帮助,这就是我创建自定义异常的原因:

class ValidationException extends \Exception
{
    private $violations;

    public function __construct(array $violations)
    {
        $this->violations = $violations;
        parent::__construct('Validation failed.');
    }

    public function getMessages()
    {
        $messages = [];
        foreach ($this->violations as $paramName => $violationList) {
            foreach ($violationList as $violation) {
                $messages[$paramName][] = $violation->getMessage();
            }
        }
        return $messages;
    }

    public function getJoinedMessages()
    {
        $messages = [];
        foreach ($this->violations as $paramName => $violationList) {
            foreach ($violationList as $violation) {
                $messages[$paramName][] = $violation->getMessage();
            }
            $messages[$paramName] = implode(' ', $messages[$paramName]);
        }
        return $messages;
    }
}

所有代码可用 here

我用下一种方式使用这个异常:

try {
    $errors = $validator->validate(...);
    if (0 !== count($errors)) {
        throw new ValidationException($errors);
    }
} catch (ValidationException $e) {
    // Here you can obtain your validation errors. 
    var_dump($e->getMessages());
}

这个解决方案对我来说很好用:

protected function violationsToArray(ConstraintViolationListInterface $violations)
{
    $messages = [];

    foreach ($violations as $constraint) {
        $prop = $constraint->getPropertyPath();
        $messages[$prop][] = $constraint->getMessage();
    }

    return $messages;
}

请注意,使用 $violations 数组键作为 属性 名称将不起作用:

    $messages = [];

    foreach ($violations as $prop => $constraint) {
        // $prop will not contain any value and this will not work as expected
        $messages[$prop][] = $constraint->getMessage();
    }

我不知道以前是不是这样,但是,使用 Symfony 5.4(可能还有一段时间),您可以在返回的 ConstraintViolationList 对象上使用字符串转换:

/** @var ConstraintViolationList $violations */
$violations = $this->validator->validate($object);
if ($violations->count()) {
    throw new \Exception('Validation failed: '.$violations);
} 

在这种情况下,当 $violations 与前一个字符串连接时会自动完成转换。当然,你无法控制输出。