Scala case match a String

Question

I'm trying to match case against a String and have the following code:

val selectedAnswers: List[Int] = questionType match {
  case "CHECK_BOX"    => {
    answerCheckBox match {
      case Some(answers) => answers
      case None => List()
    }
  }
  case "RADIO_BUTTON" => {
    answerRadio match {
      case Some(answer) => List(answer)
      case None => List()
    }
  }
  case _ => {
    List()
  }
}

Why is it not falling through the _ case when the String is not RADIO_BUTTON or CHECK_BOX?

The values for answerRadio and answerCheckbox are actually coming from the form that I'm submitting to the controller.

val (currentQuesId, questionType, answerRadio, answerCheckBox) = runExamForm.bindFromRequest.get

And the form declaration looks like:

  val runExamForm = Form(
    tuple(
      "currentQuestionId" -> number,
      "questionType" -> text,
      "answerRadio" -> optional(number),
      "answerCheckbox" -> optional(list(number))
    )
  )

Answer 1

This is "equivalent" version of your code:

val selectedAnswers: List[Int] = questionType match {
  case "CHECK_BOX"    => answerCheckBox.toList.flatten
  case "RADIO_BUTTON" => answerRadio.toList
  case _ => List()
}

Does it work as expected?

Answer 2

It's a long shot, but try replacing the _ with some other name (x is fine) and make sure that your code contains nothing but regular whitespace.

Very rarely I've seen bizarre errors like this caused by other non-printing characters in the code, which always seemed to be caused by pasting code from a chat on the OSX Skype client.

Also... Can you confirm in your code sample which line the MatchError occurs on?