Enum serialization example

EnumSerializationExample.kt

import kotlinx.serialization.*
import kotlinx.serialization.json.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*

@Serializable(with=StatusSerializer::class)
enum class Status(val value: Int) {
  Ok(0),
  NotOk(1),
  SomeOtherStatus(2)
}

@Serializable
data class SomeData(val status: Status)

object StatusSerializer : KSerializer<Status> {
    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("Status", PrimitiveKind.INT)

   override fun serialize(encoder: Encoder, value: Status) {
     encoder.encodeInt(value.value)
   }

   override fun deserialize(decoder: Decoder): Status {
     val n = decoder.decodeInt()
     return Status.values().find { it.value == n } ?: error("Invalid Status value: $n")
   }
}

println(Json.encodeToString(SomeData(status = Status.NotOk)))
println(Json.decodeFromString<SomeData>("""{"status":2}""").toString())