Can I do async form validation in Play Framework 2.x (Scala)?

Question

I\'m making a real push to understand the async powers of Play but finding a lot of conflict with regard to places where async invocation fits and places where the framework see

Answer 1

The same question was asked in the Play mailing list with Johan Andrén replying:

I'd move the actual authentication out of the form validation and do it in your action instead and use the validation only for validation of required fields etc. Something like this:

val loginForm = Form(
  tuple(
    "email" -> email,
    "password" -> text
  )
)

def authenticate = Action { implicit request =>
  loginForm.bindFromRequest.fold(
    formWithErrors => BadRequest(html.login(formWithErrors)),
    auth => Async {
      User.authenticate(auth._1, auth._2).map { maybeUser =>
        maybeUser.map(user => gotoLoginSucceeded(user.get.id))
        .getOrElse(... failed login page ...)
      }
    }
  )
}