How can I specify a class discriminator on an inte...

# serialization

[kevin.cianfarini]

How can I specify a class discriminator on an interface?

@JsonClassDiscriminator("country")
sealed interface Market {

    @Serializable @SerialName("UK")
    object UnitedKingdom : Market

    @Serializable @SerialName("US")
    enum class UnitedStates : Market {
        @SerialName("TX") Texas,
    }
}

Here the discriminator doesn’t do anything because the interface isn’t serializable (I think). I don’t want to globally specify the discriminator because it’s only applicable to this hierarchy

[kevin.cianfarini]

Right now, deserializing this fails with the following error.

Polymorphic serializer was not found for missing class discriminator ('null')
JSON input: {"country":"UK"}

[kevin.cianfarini]

If I specify the discriminator globally in my json configuration, it works fine

[Dominaezzz]

Sounds like a bug. What happens if you remove sealed ?

[ephemient]

https://github.com/Kotlin/kotlinx.serialization/issues/1576 polymorphic serialization of sealed interfaces should be coming in Kotlin 1.6.20

[kevin.cianfarini]

Yes I saw that as well. Does a class need to be marked as serializable to have a class descriminator?

[kevin.cianfarini]

@Dominaezzz removing sealed does not alleviate the problem