Cannot use DataFetcherResult as an item for GraphQL List fields

Library Version What version are you using? 4.1.1

Describe the bug A clear and concise description of what the bug is. GraphQL-Java supports using DataFetcherResult as an item for list fields with this PR, which is useful for providing local context for individual items in lists (see this issue).

However, graphql-kotlin’s schema generator throws a TypeNotSupportedException when it is provided as a return type for a resolver:

com.expediagroup.graphql.generator.exceptions.TypeNotSupportedException: Cannot convert graphql.execution.DataFetcherResult<mypackage.EntityType> since it is not a valid GraphQL type or outside the supported packages "[mypackage.graphql]"

To Reproduce Steps to reproduce the behavior. Please provide:

• Schema Configuration

graphql:
  packages:
    - "mypackage.graphql"

(no other config)

• Kotlin code used to generate the schema

data class WorldType(
    private val world: World
) {
  fun entities(
      dataFetchingEnvironment: DataFetchingEnvironment
  ): List<DataFetcherResult<EntityType>> = world.entities.map {
      DataFetcherResult.newResult<EntityType>()
          .data(it)
          .localContext(dataFetchingEnvironment.getLocalContext<LocalContext>()?.copy(
              currentEntityId = it.entityId
          ))
          .build()
  }
}

Expected behavior A clear and concise description of what you expected to happen.

There should be no TypeNotSupportedException thrown, as this configuration is supported by graphql-java and requires no type mapping by graphql-kotlin.

[teoboley]

I’ve created a PR with the change for review: https://github.com/ExpediaGroup/graphql-kotlin/pull/1150

[teoboley]

Sorry, EntityType is actually under mypackage.graphql, I had just changed out the package names for the sake of the example, it is not causing the error - the List<> wrapping of DataFetcherResult is