ReactiveMongo检索findAndUpdate的返回值

Question

将以前的answer用于ReactiveMongo 0.12.0（"org.reactivemongo" %% "play2-reactivemongo" % "0.12.0"）和Play 2.5.10。

代码完美地更新了MongoDB文档，但从不返回数据库中的值。尝试了各种方法，但findAndUpdate永远不会返回值。感谢任何帮助。

@Singleton
//class Counters extends Controller with MongoController {
class Counters @Inject()(val reactiveMongoApi: ReactiveMongoApi)(implicit exec: ExecutionContext) extends Controller with MongoController with ReactiveMongoComponents {  

def collection: JSONCollection = db.collection[JSONCollection]("counters")
def collectionBSON: BSONCollection = db.collection[BSONCollection]("counters")   

def incrementCounter(name: String):Future[Option[Long]] =  {
      import reactivemongo.api.collections.bson.BSONBatchCommands.FindAndModifyCommand.FindAndModifyResult   

      implicit val reader = Macros.reader[Counter]


      val resultFut: Future[FindAndModifyResult] = collectionBSON.findAndUpdate(
        BSONDocument("name" -> COUNTER_NAME),
        BSONDocument("$inc" -> BSONDocument("seq" -> 5)),
        fetchNewObject = true,
        upsert = true
      )
      //resultFut.map(_.result[Counter])

      val updatedCountOpt = resultFut.map { r =>
        r.result[Counter].map { p =>
          println("=====inside Counters.scala p.seq=" + p.seq)
          p.seq
        }
      }

      updatedCountOpt
  }