___type field added when custom SerialDescriptor is used

22 views

Skip to first unread message

unread,

Mar 30, 2023, 3:27:38 AM3/30/23

to kmongo

When I use custom SerialDescriptor like below

override val descriptor: SerialDescriptor = SerialDescriptor("PetDboCustomSerializer", PetDboSurrogate.serializer().descriptor)

a ___type field is assigned to the document and saved to collection. This field is not assigned when I use kotlinx 1.3.3.

Is it some known behavior?

Is it kotlinx or kbson or kmongo fault?

Used versions:

org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0

kmongo: 4.6.0

unread,

Mar 30, 2023, 9:31:27 AM3/30/23

to kmongo

I found that it's part of Kbson.

val classDiscriminator: String = "___type"

Can I somehow disable this behavior?

unread,

Mar 31, 2023, 10:12:16 AM3/31/23

to kmongo

This behavior was caused by sealed interface which I was using. After changing it to regular interface it works as expected.