Hello all! I'm trying to serialize `Any` in a nested Map and I'm using the @contextual method define...

# serialization

[Megan Teahan]

Hello all! I'm trying to serialize Any in a nested Map and I'm using the @contextual method defined in this post:

@Serializable
data class Media(
    val id: String? = null,
    val title: String? = null,
    val tracking: Map<String, Map<String, @Contextual Any>> = mapOf(),
)

val json = Json {
    ignoreUnknownKeys = true
    serializersModule = SerializersModule {
    contextual(String.serializer()) // could be an Int
    contextual(Int.serializer()) // could be a String
    contextual(Boolean.serializer()) // could be a Boolean
   }
}

val media = json.decodeFromString(Media.serializer(), MediaResponse.json) //MediaResponse.json is a string

I'm still getting this error

kotlinx.serialization.SerializationException: Serializer for class 'Any' is not found.
Mark the class as @Serializable or provide the serializer explicitly.

Am I missing something?

[turansky]

@Contextual require context for Any type (missed in json constant)

[Megan Teahan]

@turansky Thanks for the response! I'm still a little unclear on your suggestion of what needs to be added to the json constant. Mostly because Any doesn't have its own serializer so I can't do something like contextual(Any.serializer()).

[turansky]

AFAIK - you need register custom serializer in this case

[turansky]

contextual(Any::class, MyAnySerializer())

[turansky]

Problem already was discussed in this channel. You can find exact solution in channel

[turansky]

Docs - https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#custom-serializers