Jackson Scala Module, nested Lists and Maps

Question

I wish to convert lists of json objects, which in themselves may contain Json objects, or Lists of Json objects and would like the results to be Scala Maps or Lists as appropriate, however, I can only get the top level object to convert to a Map or a List. Is there a simple way to do this?

For example in REPL

objectMapper.readValue("{\"test\":\"113123\",\"myList\":[{\"test2\":\"321323\"},{\"test3\":\"11122\"}]}", classOf[Map[String,Any]])

Will return

res: Map[String,Any] = Map(test -> 113123, myList -> [{test2=321323}, {test3=11122}])

Where I would like

res: Map[String,Any] = Map(test -> 113123, myList -> List(Map(test2 -> 321323), Map(test3 -> 111222)))

Answer 1

OK so using a later version of the scala jackson module I created this class

private class NestedTypeObjectDeserializer extends JacksonUntypedObjectDeserializer {

  override def mapArray(jp: JsonParser, ctxt: DeserializationContext): AnyRef =
    super.mapArray(jp, ctxt).asInstanceOf[ArrayList[AnyRef]].asScala.toList

  override def mapObject(jp: JsonParser, ctxt: DeserializationContext): AnyRef =
    super.mapObject(jp, ctxt).asInstanceOf[LinkedHashMap[String, AnyRef]].asScala.toMap
}


private object NestedTypeObjectDeserializerResolver extends Deserializers.Base {

  lazy val OBJECT = classOf[AnyRef]

  override def findBeanDeserializer(javaType: JavaType,
                                    config: DeserializationConfig,
                                    beanDesc: BeanDescription) =
    if (!OBJECT.equals(javaType.getRawClass)) null
    else new NestedTypeObjectDeserializer
}

trait NestedTypeObjectDeserializerModule extends JacksonModule {
  this += (_ addDeserializers NestedTypeObjectDeserializerResolver)
}

which you can apply to the object mapper

val objectMapper = new ObjectMapper()
val module = new OptionModule with MapModule with SeqModule with IteratorModule with NestedTypeObjectDeserializerModule {}
objectMapper.registerModule(module)