Django：如何在构建表单之后添加一个额外的表单？ [英] Django: How to add an extra form to a formset after it has been constructed?

问题描述

这大概是我想要做的：

  def post（request）：
 VehicleFormSet = formset_factory（StaffVehicleForm）
如果request.method =='POST'：
 vehicle_formset = VehicleFormSet（request.POST）
如果在request.POST中为'add_vehicle'.POST：
如果为vehicle_formset。 is_valid（）：
 form_count = vehicle_formset.total_form_count（）
 vehicle_formset.forms.append（vehicle_formset._construct_form（form_count））
  

基本上，如果用户点击添加按钮，并且其条目有效，我想将另一个空白表单添加到表单集中，并隐藏上一个。

上面的代码的问题是我无法弄清楚如何增加 total_form_count（）。我现在有这样的方式，它将一直工作 ，然后如果再次按下它，则不会发生任何事情，大概是因为 form_count 是一样的。我也不喜欢调用 _construct_form 并依赖于内部。

解决方案

pre> class RequiredFormSet（BaseFormSet）：
def add_form（self，** kwargs）：
＃添加窗体
tfc = self.total_form_count（）
self.forms.append（self._construct_form（tfc，** kwargs））
self.forms [tfc] .is_bound = False

＃使数据可变
self.data = self.data.copy（）

＃增加隐藏表单计数
total_count_name ='％s-％s'％（self.management_form.prefix，TOTAL_FORM_COUNT）
initial_count_name ='％s-％s'％（self.management_form.prefix，INITIAL_FORM_COUNT）
self.data [total_count_name] = self.management_form.cleaned_data [TOTAL_FORM_COUNT] + 1
self.data [ initial_count_name] = self.management_form.cleaned_data [INITIAL_FORM_COUNT] + 1

def add_fields（self，form，index）：
super （RequiredFormSet，self）.add_fields（form，index）
form.empty_permitted = False


那会做到只花了7个小时才弄清楚。而我仍然不知道为什么我需要 .is_bound = False 使初始值不会松动。

This is roughly what I'm trying to do:

def post(request):
    VehicleFormSet = formset_factory(StaffVehicleForm)
    if request.method == 'POST':
        vehicle_formset = VehicleFormSet(request.POST)
        if 'add_vehicle' in request.POST:
            if vehicle_formset.is_valid():
                form_count = vehicle_formset.total_form_count()
                vehicle_formset.forms.append(vehicle_formset._construct_form(form_count))

Basically, if a user clicks the "Add" button and their entry is valid, I want to add another blank form to the formset, and hide the previous one.

The problem with the code above is that I can't figure out how to increase total_form_count(). The way I have it now, it will work once, and then if you press it again, nothing will happen, presumably because form_count is the same. I also don't like calling _construct_form and relying on the internals.

解决方案

class RequiredFormSet(BaseFormSet):
    def add_form(self, **kwargs):
        # add the form
        tfc = self.total_form_count()
        self.forms.append(self._construct_form(tfc, **kwargs))
        self.forms[tfc].is_bound = False

        # make data mutable
        self.data = self.data.copy()

        # increase hidden form counts
        total_count_name = '%s-%s' % (self.management_form.prefix, TOTAL_FORM_COUNT)
        initial_count_name = '%s-%s' % (self.management_form.prefix, INITIAL_FORM_COUNT)
        self.data[total_count_name] = self.management_form.cleaned_data[TOTAL_FORM_COUNT] + 1
        self.data[initial_count_name] = self.management_form.cleaned_data[INITIAL_FORM_COUNT] + 1

    def add_fields(self, form, index):
        super(RequiredFormSet, self).add_fields(form, index)
        form.empty_permitted = False

That will do it. Only took 7 hours to figure out. And I still don't know why I need .is_bound = False to make the initial values not screw up.

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