Question

假设我有一个像这样的json写

  implicit val userWrites: Writes[User] = (
    (__ \ "name").write[String] ~
      (__ \ "email").write[String] ~
      (__ \ "encryptedPassword").write[String] ~
      (__ \ "id").writeNullable[Long]
    )(unlift(User.unapply))

如果我不想打印输出密码，而只是打印字符串"hidden"，我怎么能用组合器实现这个目标？

我正在寻找与此相似的解决方案

  implicit val userWrites: Writes[User] = (
    (__ \ "name").write[String] ~
      (__ \ "email").write[String] ~
      (__ \ "encryptedPassword").write[String](Writes.pure("hidden")) ~
      (__ \ "id").writeNullable[Long]
    )(unlift(User.unapply))

Answer 1

你可以这样做：

InetAddress.getByName("089.108.003.152").getHostAddress();

Answer 2

这应该有效：

implicit val userWrites: Writes[User] = (
    (__ \ "name").write[String] ~
      (__ \ "email").write[String] ~
      (__ \ "encryptedPassword").write[String](Writes((_: String) => JsString("hidden"))) ~
      (__ \ "id").writeNullable[Long]
    )(unlift(User.unapply))

覆盖Play JSON Combinator Writes的值

2 个答案: