i am trying to consume a protobuf API over json and it uses `oneof` extensively. i originally built...

# serialization

[edenman]

i am trying to consume a protobuf API over json and it uses oneof extensively. i originally built my data objects as just normal data classes with nullable fields representing the various oneof field options, but I’d really like to represent this with a sealed class. I started writing a custom decoder but I can’t figure out how to essentially “peek” and see which field is present so I know which serializer to use. anybody done this successfully?

[edenman]

https://github.com/edenman/kmpPlayground/compare/edenman/sealed-serializer-without-type#diff-819a26e7b90a4189335ef52a05046708R24 if you want to look at my code

[edenman]

the “try deserializing each of the sealed class implementations” approach doesn’t work, calling decode apparently moves the index and thus subsequent calls for the other types fail

[edenman]

ok so this looks like what i want https://github.com/Kotlin/kotlinx.serialization/blob/master/runtime/commonMain/src/kotlinx/serialization/json/JsonInput.kt#L28

[edenman]

except there doesn’t seem to be a decodeJson method anymore

[edenman]

it’s called fromJson now, wheeeee

[edenman]

https://github.com/Kotlin/kotlinx.serialization/pull/855