Symfony2数据变压器，获取异常消息 [英] Symfony2 data transformers, getting exception message

问题描述

我已经创建了自己的数据变换器，如专用菜谱，这是我的逆转换：

I've created my own data transformer, as explained in the dedicated cookbook, here is my reverse transformation:

public function reverseTransform($val)
{
    // ...
    // My logic here
    // ...

    // If $val is not valid
    throw new TransformationFailedException(
        'My custom error message'
    );
}

问题是：如何获得自定义错误消息？我想将其显示为我的表单字段的错误消息。如何做？

The question is: how do I get the "custom error message" thrown? I would like to display it as the error message of my form field. How do I do that?

谢谢！

推荐答案

是：你没有变压器的工作是要好好转换，而不是进行错误检查。

Sort answer is: You don't. The transformers job is to, well, transform and not to do error checking.

将一个约束添加到字段中，该字段将检查转换的值并处理错误消息。

Add a constraint to the field which will check the transformed value and take care of error messaging.

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