kotlin serialization library which came with 1.2 -...

# announcements

[Olekss]

kotlin serialization library which came with 1.2 -> Why it can't serialize plain maps/lists? Or what I miss?
I want to have fat map and do serialization of it back and forth... and map type is <String, Any> so Any would be backed by my @Serializable annotation

[elizarov]

It should. Can you, please, shared details in #C7A1U5PTM

[sandwwraith]

Reifed type inference is not so advanced, so if you want to serializer generic class at root-level, you need to pass serializer to desired method explicitly

[sandwwraith]

There are some examples in tests: https://github.com/Kotlin/kotlinx.serialization/blob/master/runtime/jvm/src/test/kotlin/kotlinx/serialization/features/GenericTest.kt#L40

[sandwwraith]

There is even your case: https://github.com/kotlin/kotlinx.serialization/blob/13c30a004c720da2917c18e4c6cc52bbc560f891/runtime/jvm/src/test/kotlin/kotlinx/serialization/CustomSerializersJVMTest.kt#L88

[Olekss]

fun main(args: Array<String>) {

val x = mapOf<String,Any>("1" to 1,"2" to "2", "3" to 5.1)
println(JSON.stringify(x))
}

[Olekss]

Can't locate companion serializer for class interface java.util.Map (

[Olekss]

ahh ok, but I don't get it? So how can I then use the single function to serialize all my "shit" maps, dataobjects etc?

[Olekss]

looks like I need to make "switch" and look into type I am serializing, and then call stringify with one or two parameters? Or there is " generic" saver loader?

[Olekss]

Looking into source looks like I need to control on my own if I am serializing map, then I need to call one method and if I am serializing data class, I need to call different method... Not good

[Olekss]

It then looks like better solution is for me to create dummy "Container" data class, which I can simply have one parameter "payload" and by assigning this payload drop it into string...

[sandwwraith]

Well, this is the price you pay to eliminate runtime instrospection and reflection. In future, we plan to add compiler support for auto-inference serializers on call site; however, the type of object is still have to be statically available (not Any)