I am using dgs-codegen successfully since a couple of months. I saw that recently a new so called kotlin2 code generation has been added and wanted to give it a try.

I have to say I really like the way the code generation works and I'd like to use it instead of the "old" kotlin code generation.

But I have one problem :)

Currently, what I am doing to call my GQL APIs is the following:

val graphQLQueryRequest = GraphQLQueryRequest(
    query = CoursesGraphQLQuery.Builder()
        .build(),
    projection = CoursesProjectionRoot()
        .items().id(),
    scalars = scalars
)

With scalar being a mapOf(UUID::class.java to graphql.scalars.id.UUIDScalar.INSTANCE.coercing) and this works like charm.

What I would like to do, by leveraging kotlin2 implementation, is:

DgsClient.buildQuery {
    course(id = UUID.randomUUID()) {
        id // this is a UUID as well
    }
}

but when I try to do this, I get this error:

java.lang.NoSuchMethodError: 'graphql.language.Value com.netflix.graphql.dgs.client.codegen.InputValueSerializer.toValue(java.lang.Object)'

	at com.netflix.graphql.dgs.codegen.GraphQLProjection.arguments(Kotlin2Core.kt:108)
	at com.netflix.graphql.dgs.codegen.GraphQLProjection.field(Kotlin2Core.kt:138)
        TRUNCATED BY ME

If I try it without the input parameter, it works fine, that means that somehow the return parameter is able to deserialize a UUID to String.

Digging a little bit inside the kotlin2 implementation, I see that in the Kotlin2Core.kt class there is this private val inputSerializer = InputValueSerializer() instantiated in the companion object that can actually be instantiated with a custom map of scalars, but it's impossible to reach from the outside. I have no control over it.

My question is: would it be possible to make code generation for kotlin2 to create the code to pass a custom map of scalars as I do for the GraphQLQueryRequest in the first example? Maybe there is a way of doing it that I am not seeing?

Thanks a lot for your hard work!!