Trying to transform a `class Sms(val phone: String, val code: String)` into `{"sms":{"phone":"123012...

# serialization

[natario1]

Trying to transform a class Sms(val phone: String, val code: String) into {"sms":{"phone":"1230129","code":"23984"}} ... I know that I can add SmsWrapper(val sms: Sms) and require people to use it, but I'd like to use a custom serializer instead. Is there any example to do such thing?

I see many examples where structures are flattened (e.g. you remove a {} container), but couldn't find one where you do the opposite (nest data in a new {}).

[Ben Woodworth]

Here's a serializer I've written that does basically that
https://github.com/BenWoodworth/knbt/blob/186a299c00b6f0da6f6ed6a920bf037c724db377/src/commonMain/kotlin/NbtFile.kt#L52-L102

[Ben Woodworth]

You can simplify it a bunch if you only need it for the Sms class. Combine the Serializer and Deserializer classes into one KSerializer<Sms>, remove nbtFile, and replace nbtFile.tagName with "sms"

[diesieben07]

See also here: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#composite-serializer-via-surrogate