Add the /admin/orders/:number route

Very handy when switching from an order on the storefront to
the /admin bu just prepending "/admin" to the path.

backend/app/controllers/spree/admin/orders_controller.rb

@@ -10,6 +10,10 @@ class OrdersController < Spree::Admin::BaseController
       rescue_from Spree::Order::InsufficientStock, with: :insufficient_stock_error
       respond_to :html
 
+      def show
+        redirect_to action: :edit
+      end
+
       def index
         params[:q] ||= {}
         params[:q][:completed_at_not_null] ||= '1' if Spree::Config[:show_only_complete_orders_by_default]

backend/config/routes.rb

@@ -70,7 +70,7 @@
 
     delete '/product_properties/:id', to: "product_properties#destroy", as: :product_property
 
-    resources :orders, except: [:show] do
+    resources :orders do
       member do
         get :cart
         put :advance

backend/spec/controllers/spree/admin/orders_controller_spec.rb

@@ -159,6 +159,13 @@
       end
     end
 
+    describe "#show" do
+      it "redirects to :edit" do
+        get :show, params: { id: order.number }
+        expect(response).to redirect_to(spree.edit_admin_order_path(order.number))
+      end
+    end
+
     describe '#advance' do
       subject do
         put :advance, params: { id: order.number }