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JSON Reads Writes for List[(Foo, List[FoodChildren]) ]

原文 2014-09-16 14:45:34 5 2 scala/ playframework

As question says

How to best write Writes [List[(Foo, List[FoodChildren]) ] ] where each Foo and FoodChildren itself are case class ?

I am on Scala 2.11, play framework 2.3.1

2 answers

Can you use a third case class instead of a tuple? JSON doesn't support tuples.

If you use a third case class than you can use Json.format[...] to build the Reads/Writes.

Just write your own Writer instead of using the macro:

implicit val myTupleWrites = new Writes[(Int,List[FoodChildren])] {
  def writes(myTuple: (Int,List[FoodChildren])) = Json.obj(
    "i" -> myTuple._1,
    "lst" -> myTuple._2
  )
}

https://www.playframework.com/documentation/2.3.x/ScalaJson

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