我的 __init__ ModelForm 中未定义名称“实例”

Question

为什么他在我的 ModelForm 中无法识别我的视图实例“访问”？

我有这个错误：name 'instance' is not defined

我的表格：

class ReplyForm(forms.ModelForm):

    def __init__(self, *args,**kwargs):
        super (ReplyForm,self ).__init__(*args,**kwargs)
        self.fields['question'].queryset = Question.objects.get(page=instance)

    class Meta:
        model = Reply

还有我的views.py：

def access(request, instance):
    length_questions = len(questions)
    ReplyFormSet = modelformset_factory(model=Reply, form=ReplyForm, extra=length_questions, can_delete=True)
    formset = ReplyFormSet(request.POST)
    if request.method == 'POST':  
        formset = ReplyFormSet(request.POST, request.FILES)
        if formset.is_valid():
            new_instances = formset.save(commit=False)
            for new_instance in new_instances:
                new_instance.user = logged_user
                new_instance.save()
            return HttpResponseRedirect('/baseVisite/')
        else:
            return render_to_response('polls/error.html', context_instance=RequestContext(request))
    else:
        formset = ReplyFormSet(queryset=Reply.objects.none())
    return render_to_response('polls/access.html', {
 'formset': formset,
 'questions':questions,
 'logged_user':logged_user,
 'numPages' : numPages
 })

编辑网址：

url(r'^access/(?P<instance>[0-9]+)/$', views.access),

Answer 1

变量instance 仅在您的view 中定义。 如果你想在你的Form 的__init__ 方法中使用它，你必须明确地传递它。

我没有使用modelformset_factory 的经验，但如果没有它，它可能看起来像这样：

表格：

class ReplyForm(forms.ModelForm):

    def __init__(self, *args,**kwargs):
        instance = kwargs.pop('instance')
        super (ReplyForm,self ).__init__(*args,**kwargs)
        self.fields['question'].queryset = Question.objects.get(page=instance)

    class Meta:
        model = Reply

查看：

def access(request, instance):
    ...
    # explicitly pass instance as keyword argument to ReplyForm
    form  = ReplyForm(request.POST, instance=instance)
    ...