信息：
我想创建嵌套表单，通过以下位置提供的示例进行最好的描述：
http://yergler.net/blog/2009/09/27/nested-formsets-with-django/ http://yergler.net/blog/2009/09/27/nested-formsets-with-django/
此页面上的教程似乎相当不错&&它正在尝试解决我遇到的确切问题。
当没有 POST 请求数据时（即我们正在从数据库执行初始填充），views.py 文件中的此实现似乎存在问题。
可以在上面提供的 URL 中看到代码（如果需要，我可以发布一些代码，但我担心它会剥夺此处提供的信息）。
这是失败的views.py 代码（以粗体显示）：
block = get_object_or_404(models.Block, id=block_id)
if request.method == 'POST':
formset = forms.BuildingFormset(request.POST, instance=block)
if formset.is_valid():
rooms = formset.save_all()
return redirect('block_view', block_id=block.id)
else:
formset = forms.BuildingFormset(instance=block) #This is the line that is throwing the ValidationError
我收到的错误消息是：
ValidationError at "urlName":
[u'ManagementForm data is missing or has been tampered with']
我进行了更深入的挖掘，看来此故障发生在 site-packages/django/forms/formsets.py 行
The is_valid()检查失败，因为某些管理表单所需的数据（form-TOTAL_FORMS、form-INITIAL_FORMS 和 form-MAX_NUM_FORMS）无效。以下是 self.errors 的实际输出：
{u'TOTAL_FORMS': [u'This field is required.'], u'INITIAL_FORMS': [u'This field is required.']}
Code:
edit_building.html：
{{ Buildings.management_form }}
{% for Buildings.forms %}
{{ building }}
{% if building.nested %}
{% for formset in building.nested %}
{{ formset.as_table }}
{% endfor %}
{% endif %}
{% 结束 %}
视图.py：
def should_delete(self, form):
"""Convenience method for determining if the form’s object will
be deleted; cribbed from BaseModelFormSet.save_existing_objects."""
if self.can_delete:
raw_delete_value = form._raw_value(DELETION_FIELD_NAME)
should_delete = form.fields[DELETION_FIELD_NAME].clean(raw_delete_value)
return should_delete
return False
def save_all(self, commit=True):
"""Save all formsets and along with their nested formsets."""
# Save without committing (so self.saved_forms is populated)
# — We need self.saved_forms so we can go back and access
# the nested formsets
objects = self.save(commit=False)
# Save each instance if commit=True
if commit:
for o in objects:
o.save()
# save many to many fields if needed
if not commit:
self.save_m2m()
# save the nested formsets
for form in set(self.initial_forms + self.saved_forms):
if self.should_delete(form): continue
for nested in form.nested:
nested.save(commit=commit)
形式.py：
def should_delete(self, form):
"""Convenience method for determining if the form’s object will
be deleted; cribbed from BaseModelFormSet.save_existing_objects."""
if self.can_delete:
raw_delete_value = form._raw_value(DELETION_FIELD_NAME)
should_delete = form.fields[DELETION_FIELD_NAME].clean(raw_delete_value)
return should_delete
return False
def save_all(self, commit=True):
"""Save all formsets and along with their nested formsets."""
# Save without committing (so self.saved_forms is populated)
# — We need self.saved_forms so we can go back and access
# the nested formsets
objects = self.save(commit=False)
# Save each instance if commit=True
if commit:
for o in objects:
o.save()
# save many to many fields if needed
if not commit:
self.save_m2m()
# save the nested formsets
for form in set(self.initial_forms + self.saved_forms):
if self.should_delete(form): continue
for nested in form.nested:
nested.save(commit=commit)
Notes:
问题：
如果没有POST数据，而表单只是从数据库生成，那么如何正确填写'form-TOTAL_FORMS' && 'form-INITIAL_FORMS'数据来解决此故障？
