EDIT Looks like there s an open issue here

Question

EDIT Looks like there s an open issue here <https github com Kotlin kotlinx serialization issues 2132|https github com Kotlin kotlinx serialization issues 2132> Is there a clean way to approach this without a surrogate class ``` Serializable class DormaKabaKey private val file NeonFile Key lt NeonFile gt NeonFile by file SerialName fileId private val fileId ByteArray = file fileId SerialName fileDefinitionName private val fileDefinitionName String = file fileDefinitionName override fun getFileId = fileId override fun hasFileId = fileId == null override fun getFileDefinitionName = fileDefinitionName override fun hasFileDefinitionName = fileDefinitionName == null ``` For context I m using a proprietary library with NO caching support which is why I m serializing their door lock credential type and I have omitted many fields The better way to put it I don t care about NeonFile or the impl only my class and its values where it ll be then be reconstructed when being deserialized

andrew · Answer

Stack trace ```kotlinx serialization SerializationException Class b is not registered for polymorphic serialization in the scope of NeonFile Mark the base class as sealed or register the serializer explicitly at kotlinx serialization internal AbstractPolymorphicSerializerKt throwSubtypeNotRegistered AbstractPolymorphicSerializer kt 102 at kotlinx serialization internal AbstractPolymorphicSerializerKt throwSubtypeNotRegistered AbstractPolymorphicSerializer kt 113 at kotlinx serialization PolymorphicSerializerKt findPolymorphicSerializer PolymorphicSerializer kt 109 at kotlinx serialization internal AbstractPolymorphicSerializer serialize AbstractPolymorphicSerializer kt 32 at kotlinx serialization protobuf internal ProtobufEncoder encodeSerializableValue ProtobufEncoding kt 138 at kotlinx serialization protobuf internal ProtobufTaggedEncoder encodeSerializableElement ProtobufTaggedEncoder kt 135 at com stratisiot stratissdk keyring key DormaKabaKey write$Self DormaKabaKey kt 8 at com stratisiot stratissdk keyring key DormaKabaKey$$serializer serialize DormaKabaKey kt 8 at com stratisiot stratissdk keyring key DormaKabaKey$$serializer serialize DormaKabaKey kt 8 at kotlinx serialization protobuf internal ProtobufEncoder encodeSerializableValue ProtobufEncoding kt 138 at kotlinx serialization protobuf ProtoBuf encodeToByteArray ProtoBuf kt 130 ```

andrew · Answer

The nice thing about using delegation like this is that I do not need to reference the file property at all it s still a LEGIC Neon File slightly smiling face

pdvrieze · Answer

At the very least it requires `NeonFile` to be serializable have a serializer which it doesn t appear to be based upon your posted errors

andrew · Answer

NeonFile itself is an interface but the delegation provides a proprietary implementation yes

pdvrieze · Answer

You will have to explicitly mark the `file` property as `Serializable` with the type of the actual serializer to use the proprietary one should work correctly due to erasure but you could write your own little wrapper

andrew · Answer

~Or transient could work ~ fails compile check I ll try this suggestion

andrew · Answer

looks like I ll need to make a wrapper