Question

I have the following code in my application helper.

  route = ActionController::Routing::Routes.recognize_path(current_uri)
  controller = route[:controller]
  action = route[:action]
  session['route']<< [controller.to_s,action.to_s]

I get the following error
You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.<<

Some quick logging and I see that controller and action work just fine. Can you not create sessions in helpers?

Answer 1

If you want the session to hold an array of these arrays (a “stack of routes” if you will), then you first need to make sure that session[:route] is non-nil:

session[:route] ||= []
session[:route] << [controller.to_s, action.to_s]

Otherwise, simply assign it:

session[:route] = [controller.to_s, action.to_s]

Also, you should use symbols as hash keys, not strings.