Django 如何对多对多字段进行批量add？

Question

ValueError: "<OrderShipping: OS-180623085540>" needs to have a value for field "id" before this many-to-many relationship can be used.

class OrderGoodsInfo(models.Model):
    ...
....

class OrderShipping(models.Model):
    order = models.ManyToManyField(OrderGoodsInfo, blank=True, verbose_name="物流ID")
....

views.py

container_orders_id = [] 
for order in container_obj.orders.all():
    container_orders_id.append(order.id)
order_goods = OrderGoodsInfo.objects.filter(id__in=container_orders_id)
order_shipping = OrderShipping(user=request.user)
form = OrdershippingForm(request.POST, instance=order_shipping) 
if form.is_valid():
   osp = form.save(commit=False)
   osp.order.add(*order_goods)
   osp.save()

Answer 1

osp = form.save(commit=True)
osp.order.add(*order_goods) 
# osp.save()

m2m 关系只有当两边都在数据库中存在时才能添加