Why flash message won't disappear?

Question

I am doing some exception handling in my controller, when there is an exception thrown in :create action, I will render to the :new action and show a flash message.

Answer 1

Replace

flash[:alert] = t("uploading_error")

with

flash.now.alert = t("uploading_error")

and see if that is the result you expect?

flash[:alert] will stay around for the next page (hence it only disappears at the second redirect); but flash.now.alert will only display for the current page.