Question

我有基于JSON和play框架的scala REST服务。我有用户案例类

case class User(_id: BSONObjectID, username: String,password: String,creationTime: org.joda.time.DateTime)

和

object User{
val userReads: Reads[User] = (
(JsPath \ "username").read[String] (minLength[String](4) keepAnd maxLength[String] (32) ) and
(JsPath \ "password").read[String] (minLength[String](8) keepAnd maxLength[String] (32) ) 
?????)(User.apply _)

val userWrites: Writes[User] = ....
implicit val userFormat: Format[User] = Format (userReads, userWrites)
}

在注册期间（通过REST API），我需要验证传入的json。我只需要用户名和密码，我不需要_id，creationTime等。如何正确写入读取，写入只验证字段的子集（请完成读取和重放＆＃34; ?????＆＃ 34;关于你的代码）？

Answer 1

定义一个单独的class，让我们说RegistrationUser并为此class定义JSON读取和写入：

 case class RegistrationUser(userName: String, password: String)

在DB层中，您可以拥有如下类：

 case class DbUser(_id: BSONObjectID,
                   username: String,
                   password: String,
                   creationTime: org.joda.time.DateTime)

然后你可以像这样在这些类之间进行映射：

 def saveUserToDb(registrationUser: RegistrationUser): Unit = {
   val dbUser = DbUser(
     _id          = BSONObjectID.generate,
     username     = registrationUser.username,
     password     = registrationUser.password,
     creationTime = DateTime.now
   )

   // Now you have your DbUser and you can save it to Mongo as you did before
 }

您不必在整个应用程序中使用相同的模型。为各个层提供单独的模型是非常有效的 - UI，服务，数据库......

仅在REST JSON服务中公开字段子集。播放框架，scala

1 个答案: