scala - 从单位到未来的类型转换[Boolean]

Question

我有以下功能，我想返回Future[Boolean]，但 IDE 提示我返回Unit。我是 Scala 的新手。有人可以指出我做错了什么吗？

def remove(loginInfo: LoginInfo): Future[Boolean] = {
  val result = findObject(loginInfo)

  result.onSuccess {

    case Some(persistentPasswordInfo) =>

      val removeResult = remove(persistentPasswordInfo._id.toString)

      removeResult.map {
        case Left(ex) => Future.successful(false)
        case Right(b) => Future.successful(b)
      }
    case None => Future.successful(false)

  }

}

Answer 1

替换onSuccess为flatMap。假设您的remove(x: String)方法还返回 a Future，这也需要flatMapped：

def remove(loginInfo: LoginInfo): Future[Boolean] = {
  val result = findObject(loginInfo)

  result.flatMap {

    case Some(persistentPasswordInfo) =>

      val removeResult = remove(persistentPasswordInfo._id.toString)

      removeResult.flatMap {
        case Left(ex) => Future.successful(false)
        case Right(b) => Future.successful(b)
      }
    case None => Future.successful(false)

  }

}