How/Can I use a custom KSerializer?

Is it possible to use a custom defined KSerializer to store an object that does not have the @Serializable annotation defined? For example, let’s say I want to store a Date using the kotlinxPref delegate – basing this on the https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#serializing-3rd-party-classes example.

I’ve defined a KSerializer in my Kotlin file.

@file:UseSerializers(DateAsLongSerializer::class)

object DateAsLongSerializer : KSerializer<Date> {
    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("Date", PrimitiveKind.LONG)
    override fun serialize(encoder: Encoder, value: Date) = encoder.encodeLong(value.time)
    override fun deserialize(decoder: Decoder): Date = Date(decoder.decodeLong())
}

And created a SerializersModule so that I can set that in the json extension property.

val module = SerializersModule {
    contextual(DateAsLongSerializer)
}

And then defined a SimpleKrate as;

class DateKrate(context: Context) : SimpleKrate(context) {
        init {
            json = Json { serializersModule = module }
        }

        var currentDate: Date? by kotlinxPref("current-date")
    }

But when I try to assign a value to that Krate I get the following exception. Serializer for class 'Date' is not found. Mark the class as @Serializable or provide the serializer explicitly.

Any ideas of what I might be doing wrong here? (Thanks for creating this great library btw)

Edit: The alternative is to just store it as a private longPref and define a getter/setter which casts the value to and from a long. Just curious though on the use of the KSerializer.

[zsmb13]

Ah, got it. Back in 1.0.0, the publishing script I was using was incorrect, and pulled in too many things as a compile dependency, exposing them transitively despite them being listed as implementation dependencies. I fixed this in later versions.

[zsmb13]

You can follow the upcoming release here https://github.com/AutSoft/Krate/pull/24

Got a bunch of other things to include in it too