all order routes

rake routes

--- a bunch of routes ---
                    new_order_checkout GET    /orders/:order_id/checkout/new(.:format)                                           {:controller=>"checkouts", :action=>"new"}
        paypal_checkout_order_checkout        /orders/:order_id/checkout/paypal_checkout(.:format)                               {:controller=>"checkouts", :action=>"paypal_checkout"}
         paypal_confirm_order_checkout        /orders/:order_id/checkout/paypal_confirm(.:format)                                {:controller=>"checkouts", :action=>"paypal_confirm"}
         paypal_payment_order_checkout        /orders/:order_id/checkout/paypal_payment(.:format)                                {:controller=>"checkouts", :action=>"paypal_payment"}
          paypal_finish_order_checkout        /orders/:order_id/checkout/paypal_finish(.:format)                                 {:controller=>"checkouts", :action=>"paypal_finish"}
                   edit_order_checkout GET    /orders/:order_id/checkout/edit(.:format)                                          {:controller=>"checkouts", :action=>"edit"}
                        order_checkout GET    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"show"}
                                       PUT    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"update"}
                                       DELETE /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"destroy"}
                                       POST   /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"create"}
                                orders GET    /orders(.:format)                                                                  {:controller=>"orders", :action=>"index"}
                                       POST   /orders(.:format)                                                                  {:controller=>"orders", :action=>"create"}
                             new_order GET    /orders/new(.:format)                                                              {:controller=>"orders", :action=>"new"}
                            edit_order GET    /orders/:id/edit(.:format)                                                         {:controller=>"orders", :action=>"edit"}
                                 order GET    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"show"}
                                       PUT    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"update"}
                                       DELETE /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"destroy"}

--- a bunch of routes ---

                                       GET    /orders/:order_id/checkout/new(.:format)                                           {:controller=>"checkouts", :action=>"new"}
    set_shipping_method_order_checkout        /orders/:order_id/checkout/set_shipping_method(.:format)                           {:controller=>"checkouts", :action=>"set_shipping_method"}
                                       GET    /orders/:order_id/checkout/edit(.:format)                                          {:controller=>"checkouts", :action=>"edit"}
                                       GET    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"show"}
                                       PUT    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"update"}
                                       DELETE /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"destroy"}
                                       POST   /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"create"}
               add_variant_only_orders POST   /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}
                                       GET    /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}
                                       GET    /orders(.:format)                                                                  {:controller=>"orders", :action=>"index"}
                                       POST   /orders(.:format)                                                                  {:controller=>"orders", :action=>"create"}
                                       GET    /orders/new(.:format)                                                              {:controller=>"orders", :action=>"new"}
                                       GET    /orders/:id/edit(.:format)                                                         {:controller=>"orders", :action=>"edit"}
              calculate_shipping_order GET    /orders/:id/calculate_shipping(.:format)                                           {:controller=>"orders", :action=>"calculate_shipping"}
                                       GET    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"show"}
                                       PUT    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"update"}
                                       DELETE /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"destroy"}
                                       POST   /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}
                                       GET    /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}
                                       GET    /orders(.:format)                                                                  {:controller=>"orders", :action=>"index"}
                                       POST   /orders(.:format)                                                                  {:controller=>"orders", :action=>"create"}
                                       GET    /orders/new(.:format)                                                              {:controller=>"orders", :action=>"new"}
                                       GET    /orders/:id/edit(.:format)                                                         {:controller=>"orders", :action=>"edit"}
                                       GET    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"show"}
                                       PUT    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"update"}
                                       DELETE /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"destroy"}

--- a bunch of routes ---

                      order_line_items GET    /orders/:order_id/line_items(.:format)                                             {:controller=>"line_items", :action=>"index"}
                                       POST   /orders/:order_id/line_items(.:format)                                             {:controller=>"line_items", :action=>"create"}
                   new_order_line_item GET    /orders/:order_id/line_items/new(.:format)                                         {:controller=>"line_items", :action=>"new"}
                  edit_order_line_item GET    /orders/:order_id/line_items/:id/edit(.:format)                                    {:controller=>"line_items", :action=>"edit"}
                       order_line_item GET    /orders/:order_id/line_items/:id(.:format)                                         {:controller=>"line_items", :action=>"show"}
                                       PUT    /orders/:order_id/line_items/:id(.:format)                                         {:controller=>"line_items", :action=>"update"}
                                       DELETE /orders/:order_id/line_items/:id(.:format)                                         {:controller=>"line_items", :action=>"destroy"}
                     order_creditcards GET    /orders/:order_id/creditcards(.:format)                                            {:controller=>"creditcards", :action=>"index"}
                                       POST   /orders/:order_id/creditcards(.:format)                                            {:controller=>"creditcards", :action=>"create"}
                  new_order_creditcard GET    /orders/:order_id/creditcards/new(.:format)                                        {:controller=>"creditcards", :action=>"new"}
                 edit_order_creditcard GET    /orders/:order_id/creditcards/:id/edit(.:format)                                   {:controller=>"creditcards", :action=>"edit"}
                      order_creditcard GET    /orders/:order_id/creditcards/:id(.:format)                                        {:controller=>"creditcards", :action=>"show"}
                                       PUT    /orders/:order_id/creditcards/:id(.:format)                                        {:controller=>"creditcards", :action=>"update"}
                                       DELETE /orders/:order_id/creditcards/:id(.:format)                                        {:controller=>"creditcards", :action=>"destroy"}
             order_creditcard_payments GET    /orders/:order_id/creditcard_payments(.:format)                                    {:controller=>"creditcard_payments", :action=>"index"}
                                       POST   /orders/:order_id/creditcard_payments(.:format)                                    {:controller=>"creditcard_payments", :action=>"create"}
          new_order_creditcard_payment GET    /orders/:order_id/creditcard_payments/new(.:format)                                {:controller=>"creditcard_payments", :action=>"new"}
         edit_order_creditcard_payment GET    /orders/:order_id/creditcard_payments/:id/edit(.:format)                           {:controller=>"creditcard_payments", :action=>"edit"}
              order_creditcard_payment GET    /orders/:order_id/creditcard_payments/:id(.:format)                                {:controller=>"creditcard_payments", :action=>"show"}
                                       PUT    /orders/:order_id/creditcard_payments/:id(.:format)                                {:controller=>"creditcard_payments", :action=>"update"}
                                       DELETE /orders/:order_id/creditcard_payments/:id(.:format)                                {:controller=>"creditcard_payments", :action=>"destroy"}
                                       GET    /orders(.:format)                                                                  {:controller=>"orders", :action=>"index"}
                                       POST   /orders(.:format)                                                                  {:controller=>"orders", :action=>"create"}
                                       GET    /orders/new(.:format)                                                              {:controller=>"orders", :action=>"new"}
                                       GET    /orders/:id/edit(.:format)                                                         {:controller=>"orders", :action=>"edit"}
                    address_info_order GET    /orders/:id/address_info(.:format)                                                 {:controller=>"orders", :action=>"address_info"}
                                       GET    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"show"}
                                       PUT    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"update"}
                                       DELETE /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"destroy"}
                       order_shipments GET    /orders/:order_id/shipments(.:format)                                              {:controller=>"shipments", :action=>"index"}
                                       POST   /orders/:order_id/shipments(.:format)                                              {:controller=>"shipments", :action=>"create"}
                    new_order_shipment GET    /orders/:order_id/shipments/new(.:format)                                          {:controller=>"shipments", :action=>"new"}
                   edit_order_shipment GET    /orders/:order_id/shipments/:id/edit(.:format)                                     {:controller=>"shipments", :action=>"edit"}
        shipping_method_order_shipment GET    /orders/:order_id/shipments/:id/shipping_method(.:format)                          {:controller=>"shipments", :action=>"shipping_method"}
                        order_shipment GET    /orders/:order_id/shipments/:id(.:format)                                          {:controller=>"shipments", :action=>"show"}
                                       PUT    /orders/:order_id/shipments/:id(.:format)                                          {:controller=>"shipments", :action=>"update"}
                                       DELETE /orders/:order_id/shipments/:id(.:format)                                          {:controller=>"shipments", :action=>"destroy"}
                                       GET    /orders/:order_id/checkout/new(.:format)                                           {:controller=>"checkouts", :action=>"new"}
               register_order_checkout        /orders/:order_id/checkout/register(.:format)                                      {:controller=>"checkouts", :action=>"register"}
                                       GET    /orders/:order_id/checkout/edit(.:format)                                          {:controller=>"checkouts", :action=>"edit"}
                                       GET    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"show"}
                                       PUT    /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"update"}
                                       DELETE /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"destroy"}
                                       POST   /orders/:order_id/checkout(.:format)                                               {:controller=>"checkouts", :action=>"create"}
                                       GET    /orders(.:format)                                                                  {:controller=>"orders", :action=>"index"}
                                       POST   /orders(.:format)                                                                  {:controller=>"orders", :action=>"create"}
                                       GET    /orders/new(.:format)                                                              {:controller=>"orders", :action=>"new"}
                                       GET    /orders/:id/edit(.:format)                                                         {:controller=>"orders", :action=>"edit"}
                  fatal_shipping_order GET    /orders/:id/fatal_shipping(.:format)                                               {:controller=>"orders", :action=>"fatal_shipping"}
                                       GET    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"show"}
                                       PUT    /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"update"}
                                       DELETE /orders/:id(.:format)                                                              {:controller=>"orders", :action=>"destroy"}

--- a bunch of routes ---

rake routes | grep add_variant_only

      add_variant_only_orders POST   /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}
                                       GET    /orders/add_variant_only(.:format)                                                 {:controller=>"orders", :action=>"add_variant_only"}

site_extension.rb

    OrdersController.class_eval do
      skip_before_filter :verify_authenticity_token, :only => [:add_variant_only]
      def add_variant_only
        begin
          order = find_order
          variants = param[:variants].map{|variant_id, quant|[Variant.find(key), quant]}.each do |item|
            order.add_variant item[0], item[1]
          end
        rescue ActiveRecord::RecordNotFound => rnf
          flash[:error] = "Product does not exist"
          render :template => "orders/edit" 
        end          
      end
    end