My GraphQL server has a scalar type which converts...

# apollo-kotlin

[rocketraman]

My GraphQL server has a scalar type which converts to a list (ugh!). If I try to create a custom type mapping to "kotlin.List<kotlin.String>" I get an invalid character on <. Is there a way to have my custom type mapping be a list? If not, I'll create a wrapper type.

[mbonnin]

Apollo Kotlin doesn't support generic types for custom scalars but you can use a wrapper type

[mbonnin]

https://github.com/apollographql/apollo-kotlin/issues/3243

[mbonnin]

I'm hoping to revamp the custom scalar mapping with 4.0

[rocketraman]

Amazing, thanks

[mbonnin]

Sure thing!

[mbonnin]

It's still a very rough idea but I'd love to have something like this:

@GraphQLAdapter(for = "Long")
class LongAdapter: Adapter<Long> {
  override fun fromJson(...): Long {
    //..
  }

  override fun toJson(...) {
    // ...
  }
}

[mbonnin]

This way all the custom scalar would be known at compile time