def executeGraphQlQuery(query:  Document, operation: Option[String], vars: Option[JsValue])(
      implicit accessTokenOption: Option[AccessToken],
  ): Future[(StatusCode, JsValue)] = {
    val schema    = Schema(query = SchemaDefinition.QueryType, mutation = Some(SchemaDefinition.MutationType))
    val variables = vars.getOrElse(JsObject.empty)
    val deferredResolver =
      DeferredResolver.fetchers(fooFetcher, barFetcher)

    Executor
      .execute(
        schema           = schema,
        queryAst         = query,
        userContext      = service,
        variables        = variables,
        operationName    = operation,
        exceptionHandler = exceptionHandler,
        deferredResolver = deferredResolver,
      )
  }


  // ...

  val fooFetcher = Fetcher(
    (ctx: GraphQLService, ids: Seq[Ids]) => ctx.listFoos(ids),
  )(HasId(_.id))

  val fooFetcherBetter = Fetcher(
    (ctx: (GraphQLService, AccessToken), ids: Seq[Ids]) => ctx._1.listFoos(ids)(ctx._2),
  )(HasId(_.id))