I'm hitting an odd issue where a class can't seem to serialize itself, or at least it's not serializ...

# serialization

[v79]

I'm hitting an odd issue where a class can't seem to serialize itself, or at least it's not serializing its backing fields. It's a small class:

@Serializable
class GameState {
    var playerName = "Dougie McDougal"
    @Transient
    var saveFileName = "save1"

    suspend fun save() {
        println("Saving game state $saveFileName.gs.json")
        val gameStateJson = Json.encodeToString(this@GameState)
        val saveFile = applicationVfs["saves/$saveFileName.gs.json"]
        saveFile.write(gameStateJson.toByteArray())
    }
}

The serialized output is just {} - empty. playerName is not being serialised. Any thoughts?

[v79]

According to https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/basic-serialization.md#json-decoding backing fields like playerName should be serialized.

[v79]

Adding the @Required annotation has solved this, though the documentation doesn't make that explicitly needed.

[Dariusz Kuc]

I believe default values are omitted by default - its configurable by a flag OR by explicitly marking field required so it will always be present