方法声明中的case类(带有伴生对象)被评估为any

我对case类+伴生对象和(可能)它与play的交互有问题。每当我试图将它作为方法的参数传递时,它被解释为 any 而不是 EventList . 然而,在方法体中使用它是完美的。

我似乎不明白为什么。下面是所讨论的代码的简化部分(它来自于大型代码库)。

事件列表.scala:

package v1.objects

final case class EventList( ... ) {
   ...
}

object EventList {
  def apply( ... ): EventList = {
    ...
    new EventList( ... )
  }
}

对象存储库.scala:

package v1.objects

class ObjectExecutionContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")

trait ObjectRepository {
  def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int]
  ...
}

@Singleton
class ObjectRepositoryImpl @Inject()()(implicit ec: ObjectExecutionContext) extends ObjectRepository {
  override def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int] = {
    ...
    var eventList = EventList(...) // Retreive the old events from DB, works fine
    eventList = EventList(eventList.underlying :+ newEvents.underlying) // <- This fails! newEvents has type Any
    ...
  }
}

编译时的错误消息:

Error: overloaded method value apply with alternatives:
(underlying: List[v1.objects.Event])v1.objects.EventList 
<and>
(doc: org.mongodb.scala.Document)v1.objects.EventList
cannot be applied to (String, List[Object])
eventList = EventList(eventList.underlying :+ newEvents.underlying)