Use service in admin/orders/customer_details#update

app/controllers/spree/admin/orders/customer_details_controller_decorator.rb

@@ -6,7 +6,8 @@ Spree::Admin::Orders::CustomerDetailsController.class_eval do
       if params[:guest_checkout] == "false"
         @order.associate_user!(Spree.user_class.find_by_email(@order.email))
       end
-      while @order.next; end
+
+      AdvanceOrderService.new(@order).call
 
       @order.shipments.map &:refresh_rates
       flash[:success] = Spree.t('customer_details_updated')

spec/controllers/spree/admin/orders/customer_details_controller_spec.rb

@@ -39,6 +39,14 @@ describe Spree::Admin::Orders::CustomerDetailsController, type: :controller do
         login_as_enterprise_user [order.distributor]
       end
 
+      it "advances the order state" do
+        expect {
+          spree_post :update, order: { email: user.email, bill_address_attributes: address_params,
+                                       ship_address_attributes: address_params },
+                              order_id: order.number
+        }.to change { order.reload.state }.from("cart").to("complete")
+      end
+
       context "when adding details of a registered user" do
         it "redirects to shipments on success" do
           spree_post :update, order: { email: user.email, bill_address_attributes: address_params, ship_address_attributes: address_params }, order_id: order.number