关于python：内联formset is_valid错误：列表索引超出范围

inline formset is_valid error: list index out of range

尊敬的Django专家：

将内联表单集与基于类的视图合并，通过列表索引的异常无效，超出范围。

我想我的代码相当严格。

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#view.py
class EntityUpdate(updateView):
def post(self, request, *args, **kwargs):
self.object=None
form_class = self.get_form_class()
form = self.get_form(form_class)
form =myforms.add_place(request.POST)
print(form.instance)
urls_form = myforms.url_formset(self.request.POST , instance = form.instance)
if form.is_valid() and urls_form.is_valid():
return self.form_valid(form , urls_form)
else:
return self.form_invalid(form, urls_form)

#forms.py
#inlineformset definition
url_formset = inlineformset_factory(parent_model=Place,model=Urls , extra=1 )

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Traceback:
File"/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
114. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File"/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in view
69. return self.dispatch(request, *args, **kwargs)
File"/usr/local/lib/python2.7/dist-packages/braces/views.py" in dispatch
140. request, *args, **kwargs)
File"/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in dispatch
87. return handler(request, *args, **kwargs)
File"/home/ramez/code/eventsrun-project/eventsrun/eventsrunapp/views.py" in post
483. if form.is_valid() and urls_form.is_valid():
File"/usr/local/lib/python2.7/dist-packages/django/forms/formsets.py" in is_valid
292. err = self.errors
File"/usr/local/lib/python2.7/dist-packages/django/forms/formsets.py" in errors
267. self.full_clean()
File"/usr/local/lib/python2.7/dist-packages/django/forms/formsets.py" in full_clean
314. form = self.forms[i]
File"/usr/local/lib/python2.7/dist-packages/django/utils/functional.py" in __get__
49. res = instance.__dict__[self.func.__name__] = self.func(instance)
File"/usr/local/lib/python2.7/dist-packages/django/forms/formsets.py" in forms
133. forms = [self._construct_form(i) for i in xrange(self.total_form_count())]
File"/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in _construct_form
848. form = super(BaseInlineFormSet, self)._construct_form(i, **kwargs)
File"/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in _construct_form
572. kwargs['instance'] = self.get_queryset()[i]
File"/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in __getitem__
115. return self._result_cache[k]

Exception Type: IndexError at /places/Place-formset/edit/
Exception Value: list index out of range

号

知道这是什么吗？

提前谢谢

编辑：我还尝试跳过验证(is_valid())，但在.save()中仍然出现相同的错误。