Andrey Smakotin
39ab474a3c
The error occurred because: 1. OrderForm.save(commit=False) was calling reset_delivery_cost() 2. reset_delivery_cost() uses DeliveryCostCalculator which accesses order.items 3. But items don't exist yet when order is not saved to DB Solution: - OrderForm.save() now only calls reset_delivery_cost() when commit=True - order_create() explicitly calls reset_delivery_cost() AFTER saving items - This ensures items exist in DB before delivery cost calculation Error was: 'Order' instance needs to have a primary key value before this relationship can be used.