Add Spree::CheckoutController only to redirect to CheckoutController

I have not managed to make the spree checkout route, that paypal express uses, go to CheckoutController directly. According to the rails docs "to: '/checkout#edit'" should do it, but it doesnt work here.

app/controllers/spree/checkout_controller.rb

@@ -0,0 +1,8 @@
+module Spree
+  class CheckoutController < Spree::StoreController
+    def edit
+      flash.keep
+      redirect_to main_app.checkout_path
+    end
+  end
+end