Can this be updated to Rails 3.1?

[olimart]

I bought your book and I'd like to play a bit with this application unfortunately I receive:

pizzaria/app/views/carts/_cart.html.erb where line #6 raised:

undefined method `[]' for false:FalseClass Extracted source (around line #6):

Cart

• Trace of template inclusion: app/views/layouts/application.html.erb

  Application Trace | Framework Trace | Full Trace app/controllers/application_controller.rb:7:in current_cart' app/views/carts/_cart.html.erb:6:in_app_views_carts__cart_html_erb___1739811058910117597_70170754005660' app/views/layouts/application.html.erb:33:in _app_views_layouts_application_html_erb___891968134669836716_70170754710560' app/controllers/products_controller.rb:9:inindex'

[ccjr]

I'll try to update the application to Rails 3.1 in the next few days. I'll post the code, and add a comment here when it's done.

[olimart]

Any update?