no-cache issue Safari and Mozilla Firefox

rubyonrails-talk
1

Hi Folks,

I'm writing a multistep form with the the help of Ryan Bates

but I want change a little the form after the confirmation redirect to the notification page that appear to the user to communicate that the form just filled out I want that the user can't back with the 'Browser Back Button' at the confirmation page (the previous page)

to explain better what I want for me:

A = is the confirmation page

B = is the notification page

Thanks to Google I found this page

http://blog.serendeputy.com/posts/how-to-prevent-browsers-from-caching-a-page-in-rails/

And to the application_controller.rb I put

  before_filter :set_cache_buster

  def set_cache_buster     response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"     response.headers["Pragma"] = "no-cache"     response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"   end

so when the user is on B when click on the browser back button on Safari a dialog box appear

2

if click on {Send Button} appear an Rails error page

*********************************************** NoMethodError in FormonlineController#create

undefined method `deep_merge!' for nil:NilClass

...

24. session[:formonline_params].deep_merge!(params[:formonline]) if params[:formonline]

This is telling you that session[:formonline_params] has been nulled out. Try detecting that condition and, if so, setting it to empty (or some other sensible value), before this line. That will at least bypass this crash, though I don't know if it will let the back-button work as you desire.

-Dave