django编辑内联表单集数据

Question

我有一个部门表单，其中包含部门IP列表的嵌入式表单集。 我试图显示现有部门及其IP，并在需要时对其进行编辑，但是当我提交表单时，form的change_data可以正常工作，但是formset.has_changed总是返回true。

我可以在另一个模板中使用此表单和表单集添加部门，并且一切正常。 但在这里我想编辑表单（添加/删除或编辑ips）。

models.py

class Department(models.Model):
    name = models.CharField(unique=True, max_length=100)
    username = models.CharField(max_length=100)
    password = models.CharField(max_length=200)
    class Meta:
        managed = False
        db_table = 'department'

class DepartmentIps(models.Model):
    department = models.ForeignKey(Department, models.DO_NOTHING)
    department_ip_from = models.CharField(unique=True, max_length=15)
    department_ip_to = models.CharField(unique=True, max_length=15)

    class Meta:
        managed = False
        db_table = 'department_ips'

表格

class DepartmentForm(ModelForm):
    class Meta:
        model = Department

DepartmentIPFormset = inlineformset_factory(Department, DepartmentIps, exclude=('department',),
                                            widgets={'department_ip_from': forms.TextInput(
                                                attrs={'size': '6', 'class': 'form-control'),
                                                'department_ip_to': forms.TextInput(
                                                    attrs={'size': '6', 'class': 'form-control'), },
                                            extra=0, can_delete=True, validate_min=True, min_num=1)

views.py

def setting_department(request, department=1):

    currnet_d = Department.objects.get(id=department)
    if request.method == "POST":
        if 'add-department' in request.POST:
            department_form = DepartmentForm(request.POST)
            department_formset = DepartmentIPFormset(request.POST or None, instance=department_form.instance)
            if department_form.is_valid() and department_formset.is_valid():
                    new_department = department_form.save()
                    department_formset.save()
        if 'edit-department' in request.POST:
            department_form = DepartmentForm(request.POST,  prefix='edit', instance=currnet_d)
            department_formset = DepartmentIPFormset(request.POST or None, prefix='editips')

            print(department_formset.has_changed())
            for formss in department_formset:
                print(formss.changed_data)
            print(department_form.has_changed())

    department_form = DepartmentForm()
    department_formset = DepartmentIPFormset()

    edit_department_form = DepartmentForm(initial=initial_department, prefix='edit')
    edit_department_formset = DepartmentIPFormset(instance=currnet_d, prefix='editips')

    return render(request, 'config.html', locals())

在department_formsets.errors中，对于未更改的每个字段，我都会得到一个重复的字段。

如何检测数据是否已更改？ 有什么办法可以访问formset的changed_data？

提前致谢。