Hi guys, can you please help me understand where I...

# serialization

[Viktor Orlyk]

Hi guys, can you please help me understand where I am wrong? Hi, all. Maybe someone can help me understand what is the problem with my code for class serialization? Not to polute the channel posted question on stackoverflow. Thanks in advance!
https://stackoverflow.com/questions/71988144/serializer-for-class-is-not-found-mark-the-class-as-serializable-or-prov thanks

[phldavies]

ApplicationCall.respond takes a reified type parameter which is captured and used for serialization in the ContentNegotiation plugin. As such, the compile-time (not run-time) type of the parameter value is used to fully resolve the serializer to use. If you're passing the body to the .respond method with only the type BaseResponse<List<User>> known, only that type information is captured, which isn't enough to pick the right serializer. You can work around this either by casting the value to PaginatedResponse<T> in the call (i.e. call.respond(response as PaginatedResponse<T>) or use an extension to take care of resolving all possible types of BaseResponse<T> :

suspend inline fun <reified T> ApplicationCall.respond(message: BaseResponse<T>) = when(message) {
    is PaginatedResponse -> _respond(message)
    else -> _respond(message)
}

or possibly better yet would be to change BaseResponse<T> to be a sealed interface which might well solve the resolution problem for you.