Scala case having 22 fields but having issue with play-json in scala 2.11.5

Question

With Scala 2.11, we are allowed to have more then 22 fields in a case class right??

case class SomeResponse(
                                     var composi         


        

Answer 1

To make the example above compile, I had to make the type explicit:

import play.api.libs.json._
import play.api.libs.functional.syntax._

// Let's pretend this is huge:
case class Huge(a: Int, b: String, c: Boolean, d: List[Int])

object Huge {
  val fields1to2: Reads[(Int, String)] = (
    (__ \ "a").read[Int] and
    (__ \ "b").read[String]
  ).tupled

  val fields3to4: Reads[(Boolean, List[Int])] = (
    (__ \ "c").read[Boolean] and
    (__ \ "d").read[List[Int]]
  ).tupled

  val f: ((Int, String), (Boolean, List[Int])) => Huge = {
    case ((a, b), (c, d)) => Huge(a, b, c, d)
  }

  implicit val hugeCaseClassReads: Reads[Huge] = (
    fields1to2 and fields3to4
  ) { f }

}