Why can't rake routes be more helpful
new_edition GET    /editions/new(.:format)           editions#new
     edit_edition GET    /editions/:id/edit(.:format)      editions#edit
         edition GET    /editions/:id(.:format)           editions#show
                 PUT    /editions/:id(.:format)           editions#update
              DELETE /editions/:id(.:format)           editions#destroy

edition GET    /editions/:id(.:format)  editions#show  edition_path()

link_to 'Edit', [:edit, @user]     # instead of edit_user_path(@user)
redirect_to Product                # instead of products_path
form_for [@order, @product] do |f| # instead of order_product_path(@order, @product)
visit url_for [:preview, @invoice] # instead of preview_invoice_path(@invoice)