Question

I’d like /something to only be accessible for logged in users, I have a current_user helper which returns a user id or nil if the current visitor is not logged in.

Where would be the best place to limit access to /something in the controller or can it be added as part of the routes?

Answer 1

You must add in controller :before_filter and create action for that.

:before_filter :authenticate 

def authenticate
  redirect_to(registration_path) unless current_user.nil?
end

Also you can use :only or :except filter options.
Or i did not understant question?