如何自定义grails restful控制器错误响应

我们如何定制grailsRestfulController错误响应？例如，我的一个restful控制器在尝试保存对象时，在出现错误时默认返回以下响应

{
  "errors": 
  [
    {
       "object": "com.test.Task",
       "field": "description",
       "rejected-value": null,
       "message": "Property [description] of class [class com.test.Task] cannot be null"
    }
  ]
}

我想定制以下回应

{
   "errors" : 
    {
       "message": "Property [description] of class [class com.test.Task] cannot be" 
    },
    {
       "message": "This is going to be any 2nd message"
    },
    .....
}

---

使用所述的

国际化

功能。将以下内容添加到您的资源包

messages.properties

task.description.nullable = your message

或

我找到了解决办法

您只需在

org.grails.datastore.mapping.validation.ValidationErrors

类上注册自定义对象封送器

def messageSource //inject messageSource

JSON.registerObjectMarshaller(ValidationErrors) { validationErrors ->
    def errors = [] //add all errors into this list
    validationErrors.target.errors.allErrors.each { error ->
        errors.add(messageSource.getMessage(error, null)) //get messages from properties file.
    }

    //return map with errors list
    return ["errors":errors]
}

答复如下：

{
    "errors": [
        "Property [description] of class [class com.test.Task] cannot be",
        "This is going to be any 2nd message"
    ]
}

{
    "errors": [
        "Property [description] of class [class com.test.Task] cannot be",
        "This is going to be any 2nd message"
    ]
}