Parsing two kinds of json with one case class? - scala

Question

I have a case class in scala that needs to parse a json object. However the json object can look two different ways. Like this:
"hint": {
"structure": [
"HIDE"
]
}
Or like this:
"hint": {
"type": "1",
"template": "A"
}
I want to parse them both into the same case class in Scala using circe. I've trie doing something like this:
case class Hint(`type`:Option[String] = None,template:Option[String], structure: Option[List[String]])
object Hint {
implicit val hintJsonDecoder: Decoder[Hint] = deriveDecoder[Hint]
implicit val hintJsonEncoder: ObjectEncoder[Hint] = deriveEncoder[rHint]
}
But it seems like there should be a neater way of doing this so that I can just return say a list of strings in the case of the first instance, and just the type and template in the second instance. But I can't figure out how to do this using Circe.
Grateful for your help!

Answer 1

Maybe I'm not understand your question, but the use of Option gives you what you wan't. If you wanted a less verbose solution, you can use auto-derivation like as follows:
import io.circe.generic.auto._
import io.circe.parser.decode
case class HintContainer(hint: Hint)
case class Hint(`type`: Option[String], template: Option[String], structure: Option[List[String]])
object Sample extends App {
val testData1 =
"""
|{
| "hint": {
| "structure": [
| "HIDE"
| ]
| }
|}
|""".stripMargin
val testData2 =
"""
|{
| "hint": {
| "type": "1",
| "template": "A"
| }
|}
|""".stripMargin
println(decode[HintContainer](testData1))
println(decode[HintContainer](testData2))
}
Which gives:
Right(HintContainer(Hint(None,None,Some(List(HIDE)))))
Right(HintContainer(Hint(Some(1),Some(A),None)))