How to replace a JSON value in Play

Question

How do I replace a value in a JSON value in Play?
Code to illustrate:

def newReport() = Action(parse.json) { request =>
    var json = request.bod         


        

Answer 1

Something along the lines of:

val updatedJson = if((request.body \ "customerId").as[Int] == -1){
  val newId = JsObject(Seq(("customerId",JsString("ID12345"))))
  (request.body ++ newId).as[JsValue]
} else request.body

updatedJson.validate[Report](Reports.readsWithoutUser).map {
  case _: Report =>