def nextID(name: String): Future[Int] = {
    val query = BSONDocument("name" -> BSONString(name))
    val update = Update(BSONDocument("$inc" -> BSONDocument("counter" -> BSONInteger(1))), true)
    val command = FindAndModify("counters", query, update, upsert = true)

    db.command(command) map { docOpt ⇒
      docOpt match {
        case Some(document) ⇒
          document.get("counter") match {
            case Some(BSONInteger(counter)) ⇒ counter
            case _ ⇒ 0
          }
        case _ ⇒ 0
      }
    }
  }