CODEWITHSUNDEEP
jsonscala
Noel Yap
Noel Yap

Reputation: 19798

How to merge two JsValues?

I have the following:

abstract class Super(val m0: Member) {
  def toJson: JsValue = Json.toJson(Map(("m0", m0.toJson)))
}

class Sub(m0: Member, m1: Member) extends Super(m0) {
  def toJson: JsValue = ??? // should use super.toJson
}

How would Sub.toJson be defined such that it can reuse Super.toJson and produces:

// assuming m0.toJson is "member0" and m1.toJson is "member1"
{
  "m0": "member0",
  "m1": "member1"
}

Upvotes: 0

Views: 2657

Answers (1)

Ivan Meredith
Ivan Meredith

Reputation: 2222

This assumes that super.toJson returns a JsObject because we don't know the key for the member otherwise. 

class Sub(m0: Member, m1: Member) extends Super(m0){
  def toJson: JsValue = {
    (super.toJson, Json.toJson(Map(("m1", m1.toJson)))) match {
      case (mm0: JsObject, mm1: JsObject) => mm0 ++ mm1
      case _ => JsNull
    }
  }
}

Upvotes: 1

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