How to check if there's None in List[Option[_]] and return the element's name?

Question

I have multiple Option's. I want to check if they hold a value. If an Option is None, I want to reply to user about this. Else proceed.

This is what I have done:

val name:Option[String]
val email:Option[String]
val pass:Option[String]
val i = List(name,email,pass).find(x => x match{
  case None => true
  case _ => false
})
i match{
  case Some(x) => Ok("Bad Request")
  case None => {
    //move forward
  }
}

Above I can replace find with contains, but this is a very dirty way. How can I make it elegant and monadic?

Edit: I would also like to know what element was None.

Answer 1

Another way is as a for-comprehension:

val outcome = for {
  nm <- name
  em <- email
  pwd <- pass
  result = doSomething(nm, em, pwd) // where def doSomething(name: String, email: String, password: String): ResultType = ???
} yield (result)

This will generate outcome as a Some(result), which you can interrogate in various ways (all the methods available to the collections classes: map, filter, foreach, etc.). Eg:

outcome.map(Ok(result)).orElse(Ok("Bad Request"))

Answer 2

  val ok = Seq(name, email, pass).forall(_.isDefined)