Question

I’m implementing an email mechanism in Play:

1. User gets an email with a validation link
2. Clicks on it, gets to a controller that saves the “validated” bit on the user model, then redirects him to another page.
3. Before redirecting, that last page puts a message into the flash object … to be displayed later in whatever page the user ends up at, via javascript. The message says “thanks for validating your email”.
4. The target page has @With(Secure.class), so if the user is not authenticated I reach the Secure.login() method.

Now, at this point, I find that flash does not contain the message I just put in there before the redirection. What is the correct way to use flash in a way that survives this redirect?

Answer 1

This seems to work:

public class OurSecure extends Controller {

  @Before(unless={"login", "authenticate", "logout"})
  static void checkAccess() throws Throwable {
    // Authent
    if(!session.contains("username")) {

        // __ my modification __ :
        flash.keep(); 


        flash.put("url", "GET".equals(request.method) ? request.url : "/");
        // seems a good default
        login();
    }

  ...
}