Question

我正在研究python / django应用程序。在我的应用程序中有2个表Store和Ad。这有很多很多关系。

Class Store:
    ads = models.ManyToManyField(Ad, null=True, blank=True)

Class Store:
    ads = models.ManyToManyField(Ad)

我已经使用上面给出的两种实现测试了它，但是当我在没有选择广告的情况下保存我的商店时，它给了我错误：

广告：此字段是必填字段。

如何在这里设置广告可选???

查看：

class StoreView(FormView):
form_class = StoreForm
success_url = "/"
template_name = 'store.html'

def __init__(self):
    super(StoreView, self).__init__()
    self.store = None

def get_form_kwargs(self):
    kwargs = super(StoreView, self).get_form_kwargs()
    kwargs['current_user'] = self.request.user
    if 'store_id' in self.kwargs:
        self.store = Store.objects.get(id=self.kwargs['store_id'])
        kwargs['instance'] = self.store
    kwargs['request'] = self.request
    return kwargs

def get_context_data(self, **kwargs):
    context = super(StoreView, self).get_context_data(**kwargs)
    context['store_info'] = self.store
    return context

@method_decorator(login_required)
def dispatch(self, *args, **kwargs):
    return super(StoreView, self).dispatch(*args, **kwargs)

def form_invalid(self, form):
    return super(StoreView, self).form_invalid(form)

def form_valid(self, form):
    self.object = form.save()
    return super(StoreView, self).form_valid(form)

形式：

class StoreForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
    self.fields['ads'] = forms.ModelMultipleChoiceField(
        queryset=Ad.objects.filter(type=13),
        widget=forms.CheckboxSelectMultiple,
        label='Ads associated with this store'
    )

def save(self, commit=False):
    store = super(StoreForm, self).save(commit=True)
    return store

class Meta:
    model = Store

Answer 1

在表单的定义required=False字段中添加ads。覆盖模型表单中的字段时，不会从模型继承任何属性。您必须添加所有约束，例如max_length，required等。

如何设置django多对多字段以接受null

1 个答案: