播放Framework JSON Reader和自定义JSError [英] Play Framework JSON Reader and custom JSErrors

问题描述

我正在尝试读取一个可能具有来自客户端的以下参数的JSON

I'm trying to read a JSON that could have the following parameters coming from the client

{
   "email" : "[e-mail]",
   "password" : "XXXX",
   "facebookToken": "XXXXXXXXXXX"
}

facebookToken 可以为Null或不存在，在这种情况下，应该填写 Email/Password ，反之亦然.

The facebookToken could be Null or Not present, in which case the Email/Password should be filled, and vice versa.

我在构造此Reader时遇到了麻烦，这是我到目前为止所拥有的:

I'm having trouble constructing this Reader, here's what I have so far:

val loginEmail = (
  ( __ \ "email").read[String] and
  ( __ \ "password").read[String]
)((email: String, password: String) => new User(email, password))

val loginFacebook = (
  ( __ \ "facebookToken").read[String]
)((facebookToken : String) => new User(facebookToken))

val loginReader(RequestBodyJson) = (
    (RequestBodyJson).read[User](loginEmail) or
    (RequestBodyJson).read[User](loginFacebook)
)

有人可以告诉我如何正确执行此操作吗?

Can anyone show me how to do this correctly?

我还希望它返回带有自定义消息的JSError.例如，如果不存在FacebookToken，并且电子邮件出现了问题(电子邮件无效")，而不是"/facebookToken path not found"(通用的错误).

I would also like it to return JSError with customized messages. For instance, if the FacebookToken is not present, and there was something wrong with the Email ("Email was Invalid") instead of "/facebookToken path not found" generic error.

推荐答案

您可以使用以下技巧:

import play.api.libs.json._
import play.api.libs.functional.syntax._
import play.api.data.validation.ValidationError

....
(__ \ "facebookToken").read[String].orElse(Reads(_ => JsError(ValidationError("custom-error"))))

如果主阅读器失败，则可以返回自定义JsError.

You can return a custom JsError if the main reader fail.

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