When deserializing lists of polymorphic items, is ...

# serialization

[sindrenm]

When deserializing lists of polymorphic items, is it a way to set a default/fallback through annotations, or do I need to manually register it in the SerializersModule?

Like for the following example:

@Serializable sealed interface Parent

@Serializable @SerialName("child1") data class Child1(val value: Int)
@Serializable @SerialName("child2") data class Child2(val value: String)
@Serializable data object Unknown : Parent

@Serializable data class Response(val items: List<Parent>)

I know I can do this, but if there's a simpler way that keeps everything in the same place, I would prefer that.

Json {
  serializersModule = SerializersModule {
    polymorphic(Parent::class) {
      defaultDeserializer { Unknown.serializer() }
    }
  }
}