rest - 如何自定义grails Restful Controller 错误响应

Question

我们如何自定义grails RestfulController 错误响应？例如，我的 Restful Controller 之一在尝试保存对象时默认返回错误时的以下响应。

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

我想自定义响应如下。

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

Answer 1

我找到了解决方案

您需要做的是在org.grails.datastore.mapping.validation.ValidationErrors类上注册自定义对象编码

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]
}

响应将是:

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