Good morning, we have a json with a field `type` , we implemented the model with `sealed class`; ser...

# serialization

[Davide Giuseppe Farella]

Good morning,
we have a json with a field type , we implemented the model with `sealed class`; serialization works flawlessly, but deserialization doesn’t include the field type . What is the best way to deal with it? We’re on 1.4.10

[Igor Brishkoski]

They type of the variable needs to be the parent sealed class.

sealed class Response {
class Success() : Response()
}

val r: Response = Success(data)
val jsonString = Json.encode(r)

val r: Response = Json.decode("json with type")

[Davide Giuseppe Farella]

For what my coworker told me, when doin Json.encode(myClass) , the type field is skipped ( not in the generated String )

[Paul Griffith]

https://github.com/Kotlin/kotlinx.serialization/issues/1128

[Paul Griffith]

Might be relevant; I can't tell if you're deserializing data that you're generating or that's coming from elsewhere

[Igor Brishkoski]

It is skipped if the type of the variable is the implementation class itself.
So in the example above, if I replace val r: Response with val r: Success json will not add the type field. Idk if that's how it supposed to work or it's a bug.
with val r: Response you get { type: Success, data: int}
with val r: Success you get { data: int}

[Igor Brishkoski]

With the classDiscrimantor, you can change the type key to be anything, instead of type it can be pet and {pet: Dog, data: name}

[Paul Griffith]

Yeah, that's the behavior I was seeing that led me to that issue. I worked around it with a custom serializer for the inner class that delegates to the parent class' serializer, but that's not ideal

[Davide Giuseppe Farella]

Thank you for the answers