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

I've been struggling with this, too. Realistic applications are usually going to have some sort of user accounts and authentication. Instead of blocking the thread, an alternative would be to get the parameters out of the form and handle the authentication call in the controller method itself, something like this:

def authenticate = Action { implicit request =>
  Async {
    val (username, password) = loginForm.bindFromRequest.get
    User.authenticate(username, password).map { user =>
      user match {
        case Some(u: User) => Redirect(routes.Application.index).withSession("username" -> username)
        case None => Redirect(routes.Application.login).withNewSession.flashing("Login Failed" -> "Invalid username or password.")
      }
    }
  }
}