fix 500 in shop prepare dashboard

shop/admin.py

@@ -306,6 +306,9 @@ class OrderAdmin(admin.ModelAdmin):
         urls = super().get_urls()
         custom_urls = [
             path('dashboard/', self.admin_site.admin_view(self.dashboard_view), name='shop_order_dashboard'),
+            path('prepare-all/', self.admin_site.admin_view(self.prepare_all_orders), name='prepare_all_orders'),
+            path('<int:order_id>/prepare/', self.admin_site.admin_view(self.prepare_order), name='prepare_order'),
+            path('<int:order_id>/cancel-refund/', self.admin_site.admin_view(self.cancel_and_refund_order), name='cancel_and_refund_order'),
         ]
         return custom_urls + urls