用 django form 提交表单怎么批量对 m2m 字段进行保存啊？？

用 django form 提交表单怎么批量对 m2m 字段进行保存啊？？

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() 

写成这样不行啊。。。。