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GQL 查询的输入之一是案例类的嵌套列表。例如：

case class User (id: Int, name:String)

val user: InputObjectType[User] = deriveInputObjectType[User]
val arg = Argument("users", OptionInputType(ListInputType(ListInputType(user))))

当我运行应用程序时，我收到以下错误：

java.lang.ClassCastException: spray.json.JsArray cannot be cast to scala.collection.Seq
    at sangria.marshalling.FromInput$SeqFromInput.fromResult(FromInput.scala:23)
    at sangria.marshalling.FromInput$SeqFromInput.fromResult(FromInput.scala:19)
    at sangria.marshalling.FromInput$SeqFromInput.$anonfun$fromResult$1(FromInput.scala:29)
    at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:237)
    at scala.collection.Iterator.foreach(Iterator.scala:941)
    at scala.collection.Iterator.foreach$(Iterator.scala:941)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
    at scala.collection.IterableLike.foreach(IterableLike.scala:74)
    at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
    at scala.collection.TraversableLike.map(TraversableLike.scala:237)
    at scala.collection.TraversableLike.map$(TraversableLike.scala:230)
    at scala.collection.AbstractTraversable.map(Traversable.scala:108)
    at sangria.marshalling.FromInput$SeqFromInput.fromResult(FromInput.scala:25)
    at sangria.marshalling.FromInput$SeqFromInput.fromResult(FromInput.scala:19)
    at sangria.execution.ValueCollector$.$anonfun$getArgumentValues$6(ValueCollector.scala:149)
    at sangria.execution.ValueCoercionHelper.resolveMapValue(ValueCoercionHelper.scala:162)
    at sangria.execution.ValueCollector$.$anonfun$getArgumentValues$4(ValueCollector.scala:156)
    at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
    at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
    at scala.collection.immutable.List.foldLeft(List.scala:89)
    at sangria.execution.ValueCollector$.getArgumentValues(ValueCollector.scala:132)
    at sangria.execution.ValueCollector.getArgumentValues(ValueCollector.scala:103)
    at sangria.execution.ValueCollector.$anonfun$getFieldArgumentValues$1(ValueCollector.scala:87)
    at sangria.util.ConcurrentHashMapCache.getOrElseUpdate(ConcurrentHashMapCache.scala:29)
    at sangria.execution.ValueCollector.getFieldArgumentValues(ValueCollector.scala:87)
    at sangria.execution.Resolver.resolveField(Resolver.scala:1412)
    at sangria.execution.Resolver.$anonfun$collectActionsPar$1(Resolver.scala:709)
    at scala.collection.TraversableOnce.$anonfun$foldLeft$1(TraversableOnce.scala:160)
    at scala.collection.TraversableOnce.$anonfun$foldLeft$1$adapted(TraversableOnce.scala:160)
    at scala.collection.Iterator.foreach(Iterator.scala:941)
    at scala.collection.Iterator.foreach$(Iterator.scala:941)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
    at scala.collection.IterableLike.foreach(IterableLike.scala:74)
    at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
    at scala.collection.TraversableOnce.foldLeft(TraversableOnce.scala:160)
    at scala.collection.TraversableOnce.foldLeft$(TraversableOnce.scala:158)
    at scala.collection.AbstractTraversable.foldLeft(Traversable.scala:108)
    at sangria.execution.Resolver.collectActionsPar(Resolver.scala:699)
    at sangria.execution.Resolver.resolveFieldsPar(Resolver.scala:45)
    at sangria.execution.Executor.executeOperation(Executor.scala:275)
    at sangria.execution.Executor.$anonfun$execute$7(Executor.scala:206)
    at scala.concurrent.Future.$anonfun$flatMap$1(Future.scala:307)
    at scala.concurrent.impl.Promise.$anonfun$transformWith$1(Promise.scala:41)
    at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
    at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
    at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:92)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
    at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:85)
    at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:92)
    at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
    at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:49)
    at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

输入请求：

{
  "users": [
    [
      {
        "id": "8",
        "name": "BEGINS_WITH"
      },
      {
        "id": "8",
        "name": "BEGINS_WITH"
      }
    ],
    [
      {
        "id": "8",
        "name": "BEGINS_WITH"
      }
    ]
  ]
}

任何帮助都会得到帮助。谢谢

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