Before this schedules were being deleted when the Checkout Options step of editing order cycles was saved because this step wasn't sending the :schedule_ids parameter. It's more awkard for API users if they always need to explicity send the :schedule_ids parameter even if they don't want to add/remove any of the schedules, for example if they just want to update an order cycle name.
Before if a shipping method was shared between multiple distributors it could only be disabled/enabled on that order cycle for all the distributors which have that shipping method e.g. you couldn't select that shipping method for one distributor but disable it for another.
Before the OrderCycleShippingMethod had a validation which checked the shipping method belonged to the order cycle distributor. Instead of this validation this just ignores shipping methods which don't belong to one of the order cycle's distributors when they are being attached in the OrderCycleForm service. This pattern is already being used in the OrderCycleForm service for ignoring Schedules that the person doesn't own.
Co-authored-by: Maikel <maikel@email.org.au>
It's a clearer name because 'preferred' implies there could be other unpreferred shipping methods available as well.
Co-authored-by: Maikel <maikel@email.org.au>
It makes things much simpler if we return all shipping methods by default without needing OrderCycleShippingMethod records to be added to the database.
Co-authored-by: Maikel <maikel@email.org.au>
