Django Formset:有没有可能在CreateView的post()方法中添加缺少的字段内容？

from django.forms import formset_factory
from django.views.generic.edit import CreateView
from .models import MyModel
from .forms import MyForm

class MyCreateView(CreateView):
    model = MyModel
    form_class = MyForm
    template_name = 'my_template.html'
    success_url = '/success/'

    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)
        Formset = formset_factory(MyForm, extra=2)
        formset = Formset()
        data['formset'] = formset
        return data

    def post(self, request, *args, **kwargs):
        form = self.get_form()
        formset = formset_factory(MyForm, extra=2)(request.POST)

        if form.is_valid() and formset.is_valid():
            # 处理主表单数据
            self.object = form.save()

            # 处理Formset中的表单数据
            for sub_form in formset:
                if sub_form.has_changed():
                    # 添加缺少的字段内容
                    if 'missing_field' not in sub_form.cleaned_data:
                        sub_form.cleaned_data['missing_field'] = 'default_value'

                    # 保存表单数据
                    sub_form.instance = self.object
                    sub_form.save()

            return self.form_valid(form)

        return self.form_invalid(form)