How could I properly work with Scala Play Read? - json

Question

According to this documentation (official):
https://www.playframework.com/documentation/2.8.x/ScalaJsonCombinators
I have to create a case class, after that I have to create a JsonReader:
val nameReads: Reads[String] = (JsPath \ "name").read[String]
then
val nameResult: JsResult[String] = json.validate[String](nameReads)
So, the result would be into nameResult and it was expecting that data was accessible like this:
println(nameResult.name)
Unfortunately, it doesn't work. It doesn't print results or return them.
First of all I work with Future and read JSON from web
implicit val context = scala.concurrent.ExecutionContext.Implicits.global
val userReads: Reads[User] = (
(JsPath \ "id").read[Int] and
(JsPath \ "login").read[String]
)
val futureResult = wc.url(path).get().map {
response =>
response.json.validate[User](userReads)
}
futureResult.map(r => println(r.id, r.login))
But! This code works, but it isn't in documentation.
implicit val context = scala.concurrent.ExecutionContext.Implicits.global
val userReads: Reads[User] = (
(JsPath \ "id").read[Int] and
(JsPath \ "login").read[String]
)
val futureResult = wc.url(path).get().map {
response =>
UserTest(
(response.json \ "id").as[String],
(response.json \ "login").as[String]
)
}
futureResult.map(r => println(r.id, r.login))
Does somebody know why code into documentation doesn't work? What is wrong with it?
Could I use my code?

Answer 1

Calling validate[User] doesn't return a User but a JsResult[User]. This is because the JSON data might be invalid and your code needs to handle this case. There is an example in the documentation that you have linked to:
json.validate[Place] match {
case JsSuccess(place, _) => {
val _: Place = place
// do something with place
}
case e: JsError => {
// error handling flow
}
}