如何在 scala 中的 json object 中包含多个项目？

Question

I'm trying to include more than one item in my json object (currently I can only add one item),

In my scala class I have:

case class Api(row:Int,name:String,age:Int)

Ok(Json.obj("status" -> "ok", "cars" -> carsBooked.map(_.row), "saved" -> saved, "failed" -> failed, "notBooked" -> Response.errors)) <<---- this works perfectly and I'm able to get a list of all the row in json, but how do i add name and age?

Ideally I wanna do something like carsBooked.map(_.row._name etc..)

Thanks!

Answer 1

If we have

case class Api(row: Int, name: String, age: Int)

then we can generate codecs automatically .

object Api {
  implicit val apiReads: Reads[Api] = Json.reads[Api]
  implicit val apiWrites: OWrites[Api] = Writes.writes[Api]
}

and then we could write:

Ok(Json.obj("status" -> "ok", "cars" -> Json.toJson(carsBooked), "saved" -> saved, "failed" -> failed, "notBooked" -> Response.errors))

or we can actually make this also automated:

case class ApiResult(
  status: String,
  cars: List[Api],
  saved: List[String],
  failed: List[String],
  notSaved: List[String]
)
object ApiResult {
  implicit val apiResultReads: Reads[ApiResult] = Json.reads[ApiResult]
  implicit val apiResultWrites: OWrites[ApiResult] = Writes.writes[ApiResult]
}

val apiResult: ApiResult = ...
Ok(Json.toJson(apiResult))