具有内联模型表单或formset的基于类的基于django的视图

Question

我有以下型号:

class Bill(models.Model):
    date = models.DateTimeField(_("Date of bill"),null=True,blank=True)

class Item(models.Model):
    name = models.CharField(_("Name"),max_length=100)
    price = models.FloatField(_("Price"))
    quantity = models.IntegerField(_("Quantity"))
    bill = models.ForeignKey("Bill",verbose_name=_("Bill"),
                             related_name="billitem")

我知道这是可能的:

from django.forms.models import inlineformset_factory
inlineformset_factory(Bill, Item)

然后通过标准视图处理.

现在我想知道,如果有一种方法可以实现相同的(意思是:使用内联来添加/编辑属于账单的项目)使用基于类的视图(而不是管理界面).

Answer 1

要点是:

1. FormSet在forms.py使用中生成的inlineformset_factory:

   BookImageFormSet = inlineformset_factory(BookForm, BookImage, extra=2)
   BookPageFormSet = inlineformset_factory(BookForm, BookPage, extra=5)
   

2. FormSet在一个CreateView班级中返回s views.py:

   def get_context_data(self, **kwargs):
       context = super(BookCreateView, self).get_context_data(**kwargs)
       if self.request.POST:
           context['bookimage_form'] = BookImageFormSet(self.request.POST)
           context['bookpage_form'] = BookPageFormSet(self.request.POST)
       else:
           context['bookimage_form'] = BookImageFormSet()
           context['bookpage_form'] = BookPageFormSet()
       return context
   

3. 用于form_valid保存表单和formset:

    def form_valid(self, form):
        context = self.get_context_data()
        bookimage_form = context['bookimage_formset']
        bookpage_form = context['bookpage_formset']
        if bookimage_form.is_valid() and bookpage_form.is_valid():
            self.object = form.save()
            bookimage_form.instance = self.object
            bookimage_form.save()
            bookpage_form.instance = self.object
            bookpage_form.save()
            return HttpResponseRedirect('thanks/')
        else:
            return self.render_to_response(self.get_context_data(form=form))
   

Answer 2

在查看了一些预先制作的CBV后,我刚刚添加了自己的版本.我特别需要multiple formsets -> one parent在单个视图中进行控制,每个视图都有单独的保存功能.

我基本上将FormSet数据绑定填充到一个get_named_formsets由get_context_dataand 调用的函数中form_valid.

在那里,我检查所有表单集是否有效,并且还查找一个方法,formset.save()在每个表单集的基础上覆盖普通旧表单以进行自定义保存.

模板通过渲染formset

{% with named_formsets.my_specific_formset as formset %}
 {{ formset }}
 {{ formset.management_form }}
{% endwith %}

我想我会定期使用这个系统.

class MyView(UpdateView): # FormView, CreateView, etc
  def get_context_data(self, **kwargs):
        ctx = super(MyView, self).get_context_data(**kwargs)
        ctx['named_formsets'] = self.get_named_formsets()
        return ctx

    def get_named_formsets(self):
        return {
            'followup': FollowUpFormSet(self.request.POST or None, prefix='followup'),
            'action': ActionFormSet(self.request.POST or None, prefix='action'),
        }

    def form_valid(self, form):
        named_formsets = self.get_named_formsets()
        if not all((x.is_valid() for x in named_formsets.values())):
            return self.render_to_response(self.get_context_data(form=form))

        self.object = form.save()

        # for every formset, attempt to find a specific formset save function
        # otherwise, just save.
        for name, formset in named_formsets.items():
            formset_save_func = getattr(self, 'formset_{0}_valid'.format(name), None)
            if formset_save_func is not None:
                formset_save_func(formset)
            else:
                formset.save()
        return http.HttpResponseRedirect('')

    def formset_followup_valid(self, formset):
        """
        Hook for custom formset saving.. useful if you have multiple formsets
        """
        followups = formset.save(commit=False) # self.save_formset(formset, contact)
        for followup in followups:
            followup.who = self.request.user
            followup.contact = self.object
            followup.save()

Answer 3

你应该试试django-extra-views.寻找CreateWithInlinesView和UpdateWithInlinesView.