Hi I am a little lost here I want to serialize a map with a third party class as a key I couldn t find in docs where to add custom serializer module `Map lt RealmUUID Long gt ` I created this serializer but don t know how to use ``` OptIn ExperimentalSerializationApi class Serializer forClass = RealmUUID class object RealmUUIDSerializer KSerializer lt RealmUUID gt override val descriptor SerialDescriptor = PrimitiveSerialDescriptor RealmUUID PrimitiveKind STRING override fun serialize encoder Encoder value RealmUUID val string = value toString encoder encodeString string override fun deserialize decoder Decoder RealmUUID val string = decoder decodeString return RealmUUID from string ```

Hi, I am a little lost here. I want to serialize a map with a third party class as a key. I couldn't find in docs where to add custom serializer module.

Map<RealmUUID, Long>

I created this serializer but don't know how to use

@OptIn(ExperimentalSerializationApi::class)
@Serializer(forClass = RealmUUID::class)
object RealmUUIDSerializer : KSerializer<RealmUUID> {
	override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("RealmUUID", PrimitiveKind.STRING)

	override fun serialize(encoder: Encoder, value: RealmUUID) {
		val string = value.toString()
		encoder.encodeString(string)
	}

	override fun deserialize(decoder: Decoder): RealmUUID {
		val string = decoder.decodeString()
		return RealmUUID.from(string)
	}
}

Emil Kantis

04/05/2023, 7:26 AM

I think you can annotate the type-parameter to your map

Map<@Serializable(with = RealmUUIDSerializer::class) RealmUUID, Long>

Pushpendra Parmar

04/05/2023, 3:57 PM

Thank you. But it is still throwing exception

can't be used in JSON as a key in the map. It should have either primitive or enum kind

but found another way using

json.encodeToString(MapSerializer(RealmUUIDSerializer, Long.serializer()), objectMetadataList)

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