Scala 向量到案例类

Question

I want to map this result query that showed vector to case class

dal:

def selectPerson = sql"select * from PERSON".as[(String,String)]

service:

def ListPerson: Future[Seq[(String,String)]] = { 
  db.run(GroupDealerDetailDal.selectPerson)
}

controller:

def listPerson = Action.async { implicit request =>
  GroupDealerDetailService.ListPerson.map(result =>
    Ok(Json.toJson(result.toString)))
}

case class:

case class Person(username: String, password: String)

object Person {
  implicit val personFormat = Json.format[Person]
}

the result is Vector((prastyo,12345))

how can I map that result to case class Person

so the result is {"username" : "prastyo", "password" : "12345"}

Answer 1

It sounds like you want JSON output, so I suspect that the inner part should be something like this (not tested):

GroupDealerDetailService.ListPerson.map { people => Ok(
    Json.toJson(
        people map { case (username, password) =>
            Person(username, password)
        }
    )
)}

Answer 2

If you want map DB result to Json response, you dont need extra case class and transformations. You may use coast-to-coast design with Json writes combinators.

Simple writes

val u: OWrites[(String, String)] = (
  (__ \ "username").write[String] and 
  (__ \ "password").write[String]
).tupled

map your (String, String) to JsObject .

u.writes("prastyo" -> "12345")

res17: play.api.libs.json.JsObject = {"username":"prastyo","password":"12345"}

With Writes.traversableWrites

val s = Writes.seq(u)

you can map your Vector to JsArray

s.writes(Seq("prastyo" -> "12345"))
res16: play.api.libs.json.JsValue = [{"username":"prastyo","password":"12345"}]

complete controller:

def listPerson = Action.async {
  GroupDealerDetailService.ListPerson.map(s.writes).map(Ok(_))
}