Kotlinx.Serialization: Exclude object from serialization if all inner properties are also excluded

Question

I’m trying to implement functionality that excludes the whole object from the serialization if all inner objects are excluded.

For example when I want to serialize this data class to json

data class Car(val engine: Engine? = null, val size: Size?  = null)
data class Engine(val type: String?  = null, val horsePower: Int?  = null)
data class Size(val size: Int? = null)

Car(engine = Engine(horsePower = null), size = Size(size = 1000))

then I should get the following output (engine is excluded even if it is set)

car {
    size {
        size = 1000
    }
}

Does anyone have any tip on how to achieve this?

What you are using for serialization ? – Eklavya Jul 01 '20 at 18:56 — Eklavya, Jul 01 '20 at 18:56

Eklavya · Answer 1 · 2020-07-02T06:47:43.217

5

For kotlinx.serialization use @kotlinx.serialization.Transient

data class Car(
   
   @kotlinx.serialization.Transient
   val engine: Engine? = null
   ...

edited Jul 02 '20 at 06:47

answered Jul 01 '20 at 19:02

Eklavya

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I'm not. The question starts with kotlinx.serialization – user2875643 Jul 02 '20 at 06:43

Kotlinx.Serialization: Exclude object from serialization if all inner properties are also excluded

1 Answers1