It's not used only on the decorator. That's why I added the method here. The idea was that for now `ensure_updated_shipments` would keep logic related to trigger the creation of new updated shipments. We need that trigger every where spree updates line items, `Spree::OrdersController` and on the `update_line_items` method on the api Order decorator. We could as well just repeat that line instead of creating a method but then we'd not focus that logic in one single place. Makes sense?