信息：
我想创建嵌套表单，如通过以下示例提供的最佳描述：
http://yergler.net/blog/2009/09/27/nested-formsets-with-django/
此页面上的教程似乎非常好 && 它试图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。
代码可以在上面提供的 URL 中看到（如果需要，我可以发布一些代码，但我担心它会从这里提供的信息中删除）。
这是失败的views.py代码（粗体）：
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']
我已经深入挖掘，看来这个失败发生在 site-packages/django/forms/formsets.py
检查失败，is_valid()因为一些管理表单所需的数据（form-TOTAL_FORMS、form-INITIAL_FORMS 和 form-MAX_NUM_FORMS）无效。下面是 self.errors 的实际输出：
{u'TOTAL_FORMS': [u'This field is required.'], u'INITIAL_FORMS': [u'This field is required.']}
代码：
edit_building.html：
{{ building.management_form }}
{% for building.forms %}
{{ building }} {% if building.nested %} {% for formset in building.nested %} {{ formset.as_table }} {% endfor %} {% endif %}{% endfor %}
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)
表格.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)
笔记：
我已经查看了https://docs.djangoproject.com/en/dev/topics/forms/formsets/#understanding-the-managementform上的 django 文档，并没有发现任何有用的东西来讨论这些值是如何自动填充的由 DJANGO
我正在使用 Django V1.5
问题：
如果没有 POST 数据，并且表单是完全从数据库生成的，如何正确填写 'form-TOTAL_FORMS' && 'form-INITIAL_FORMS' 数据以解决此故障？