Question

I am trying to add a before_destroy filter to Devise’s SessionsController.

Here is what I have attempted:

I created a module containing the before_destroy filter and another module with the method that I wanted it to call.

module UserTracker

  prepend_before_filter :stop_tracking, :only => [:destroy]

  module TrackerStopper
    def stop_tracking
      # Do stuff
    end
  end

  include TrackerStopper
end

And then I tried to extend the SessionsController with the UserTracker module.

Devise::SessionsController.extend UserTracker

This was not working, because devise was not loaded when my module was loaded. This resulted in the error below:

uninitialized constant Devise::SessionsController (NameError)

Basically, I would like to run a method each time a session gets destroyed, without overwriting the entire SessionsController, but I can’t figure out a way to mix it in.

Thanks!

UPDATE 1: I gave up on building a separate gem, here is the code I have attempted in my application.

UserTrackersController.rb

class  UserTrackersController < Devise::SessionsController
  prepend_before_filter :stop_tracking, :only => [:destroy]

  def stop_tracking
    current_user.update_attributes(:current_sign_in_ip => nil)
  end
end

routes.rb

#--
# Devise
devise_for :users, :controllers => { :sessions => 'user_trackers'}

The problem now is that if I try to log in (or log out in this case), I get the following error:

Template is missing

Missing template user_trackers/new with {:handlers=>[:erb, :rjs, :builder, :rhtml, :rxml], :formats=>[:html], :locale=>[:en, :en]} in view paths "/net/user10/ardavis2/rubydev/spacecamp/app/views", "/net/user10/ardavis2/.rvm/gems/ruby-1.9.2-p180@spacecamp/gems/devise-1.3.4/app/views"

I don’t want my new UserTrackersController to do anything except add some small code to the existing Sessions controller. So I still need devise to function as it did before.

Thanks again.

Answer 1

Why don’t you really extend SessionsController?

E.g.

class MySessionsController < Devise::SessionsController
  # my changes
end

And in the routing config, you can tell devise_for which SessionsController to use:

devise_for :controllers => { :sessions => "my_sessions" } 

Edit: you can generate devise views by invoking:

rails g devise:views <scope>

This will generate app/views/devise/sessions/new.html.erb which is the only view you need for this to work. Just copy it to app/views/my_sessions/new.html.erb and it will work.