Execute UI action upon Future failure

[John Murdoch]

Hi,

I'm trying to show a toast when a Future fails:

   def attemptLogin(): Ui[Any] = {
    if (password.get.getText.length == 0 || password.get.getText.length == 0) {
      toast("Provide username and password") <~ fry
    } else {
      val loginResult = service.login(username.get.getText.toString, password.get.getText.toString)

      loginResult.onComplete {
        case Success(token) =>
          // do something

        case Failure(t) =>
          error(s"Login failed '${t.getMessage}'", t)

          Ui { 
            toast(s"Login failed: ${t.getMessage}") <~ fry // <---- this doesn't appear
          }.run
      }

    Ui{}
  }

     // when creating view

        w[Button] <~ wire(signIn) <~ text("Sign In") <~ On.click({
          attemptLogin()
        })

However, the toast never appears, even though the execution path is invoked (I see the "Login failed ..." in logs). 

I also tried `runUi { toast("...") }` with same results.

login method is a 'dispatch' HTTP library call.

Regards,
John

[Nick Stanchenko]

Hi,

`toast(...) <~ fry` return a Ui, so you don’t need to wrap it into another one. `runUi(toast(...) <~ fry)` should do the trick (the difference from your second example is that you missed the `fry`).

Let me know if that worked,

Nick

[John Murdoch]

Nick,

No, it did not. 

I tried:

case Failure(t) =>
  info("Got failure")
  runUi {
    info("About to show toast")

    toast(s"Login failed: ${t.getMessage}") <~ fry
  }

And in logs I see:

12-31 10:40:58.252  21805-22711/myapp I/:ctivity.LoginActivity﹕ Got failure
12-31 10:40:58.252  21805-22711/myapp I/:ctivity.LoginActivity﹕ About to show toast

But no toast appears :(. 

Regards,

John

[Nick Stanchenko]

John,

Would it be possible for you to produce a self-contained example? I don’t see why this wouldn’t work.

Nick

[John Murdoch]

Nick,

I changed proguard config and the issue went away (using same source code). Thanks for your help.

Regards,

John