尝试使用 scala Try 函数获取错误时出错

Question

我试图用 try 捕获一些错误，但我遇到了一些错误，我不知道为什么，这是代码：

class Application extends Controller {

  val ds: DataSource = CsvDataSource
  val purchaseDS = PurchaseInfo.fromDataSource(ds)_


  def index = Action { implicit request =>
    Ok(views.html.index())
  }

  def redirectToIndex = Action {
    Redirect(routes.Application.index)
  }

  case class csvUploadData(clientUrl: String)
  val csvUploadForm = Form(
    mapping(
      "clientUrl" -> nonEmptyText)(csvUploadData.apply)(csvUploadData.unapply))

  def uploadCSV = Action.async(parse.multipartFormData) { implicit request =>
    csvUploadForm.bindFromRequest.fold(
      formWithErrors => {
        Future {
          Redirect(routes.Application.index).flashing(
            "error" -> formWithErrors.error("clientUrl").get.message)
        }
      },
      userData => {
        request.body.file("csvFile").fold(Future {
          Redirect(routes.Application.index).flashing(
            "error" -> "Missing CSV file").withSession(request.session)
        }) { formFile =>
          import java.io.File
          val filename = formFile.filename
          Future {
            val file = formFile.ref.file
            val purchaseInfos = purchaseDS(file)

            val t = Try {
              val driver: WebDriver = new FirefoxDriver
              val actions: ActionsHMRC = new ActionsHMRC(driver, userData.clientUrl)

              val results = actions.insertData(purchaseInfos)
              results.filter(_._2.isFailure)
            }
            t match {
              case Success(failures) =>
                val failedMsg = if (failures.nonEmpty) failures.mkString("The following rows failed: [",",","]") else ""
                Redirect(routes.Application.index).flashing(
                "success" -> s"The file '$filename' automation successfuly.\n$failedMsg")
              case Failure(e) =>
                println(e)
                Redirect(routes.Application.index).flashing(
                "error" -> s"The file '$filename' automation failed.")
            }
          }
        }
      })
  }
}

ActionsHMRC 方法：

def insertData(purchaseInfos: Seq[PurchaseInfo]) = {
    login()
    purchaseInfos.map { case purchaseInfo =>
      (purchaseInfo, Try(doActions(purchaseInfo)))
    }
    println("done insertData function")
  }

那些线是红色的（所以它们有问题）我不明白为什么...

过滤器(_._2

非空

mkString

如果你知道可能发生了什么，它会帮助分配，谢谢

Answer 1

insertData，写入returns单位。单元没有过滤方法。

我建议向方法（以及任何 public 方法）添加一个 return 类型，这将帮助编译器向您提供更接近错误实际位置的错误消息。

尝试使用 scala Try 函数获取错误时出错

error trying to get errors with scala Try function

java

scala

scala-collections