I believe this may be a bad idea, in general, but here is a cheap way
I have seen a lot of posts on cookie detection in Rails. I believe this may be a bad idea, in general, but here is a cheap way to detect whether or not cookies are enabled in the browser. Just add a before_filter that checks for the presence of the application's cookie.
class ApplicationController < ActionController::Base before_filter :check_cookie ... private def check_cookie cookie_name = Rails.application.config.session_options[:key] if request.cookies[cookie_name].to_s.blank? flash[:error] = "To use this site, you must enable cookies in your browser's settings." end end end
..And Voila! Now if your users try to view any page, they will see a nice Flash message about their cookies!