您可以覆盖内联表单集以实现所需的功能。在表单集的clean方法中，您可以通过“实例”成员访问Shopping实例。因此，您可以使用购物模型暂时存储计算出的总数，并使表单集进行通信。在models.py中：
class Shopping(models.Model):
shop_name = models.CharField(max_length=200)
def __init__(self, *args, **kwargs)
super(Shopping, self).__init__(*args, **kwargs)
self.__total__ = None
在admin.py中：
from django.forms.models import BaseInlineFormSet
class ItemInlineFormSet(BaseInlineFormSet):
def clean(self):
super(ItemInlineFormSet, self).clean()
total = 0
for form in self.forms:
if not form.is_valid():
return #other errors exist, so don't bother
if form.cleaned_data and not form.cleaned_data.get('DELETE'):
total += form.cleaned_data['cost']
self.instance.__total__ = total
class BuyerInlineFormSet(BaseInlineFormSet):
def clean(self):
super(BuyerInlineFormSet, self).clean()
total = 0
for form in self.forms:
if not form.is_valid():
return #other errors exist, so don't bother
if form.cleaned_data and not form.cleaned_data.get('DELETE'):
total += form.cleaned_data['cost']
#compare only if Item inline forms were clean as well
if self.instance.__total__ is not None and self.instance.__total__ != total:
raise ValidationError('Oops!')
class ItemInline(admin.TabularInline):
model = Item
formset = ItemInlineFormSet
class BuyerInline(admin.TabularInline):
model = Buyer
formset = BuyerInlineFormSet
这是您可以做到的唯一干净方法（据我所知），一切都放置在应有的位置。
添加了 if form.cleaned_data 检查，因为表单也包含空内联。请让我知道它如何为您服务！
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