Django ModelChoiceField未使用新数据更新

使用Django 1.7，我有一个

modelcooicefield

，当基础数据更新时，它不会得到更新。要显示新的数据行，我需要重新启动web服务器

Django表单、字段、视图：

class JobsModelChoiceField(forms.ModelChoiceField):

    def __init__(self, *args, **kwargs):
        super(JobsModelChoiceField, self).__init__(*args, **kwargs)
        groups = groupby(sorted(kwargs['queryset'], key=attrgetter('company')), attrgetter('company'))
        self.choices = [(company, [(t.id, self.label_from_instance(t)) for t in title])
                        for company, title in groups]

    def label_from_instance(self, job):
        return u'{} {}'.format(job.id, job.title)

class NewApplicationForm(forms.Form):
    id = JobsModelChoiceField(queryset=Job.objects.all(),
                                widget=forms.Select(attrs={'class':'chosen-select'}))
    first_name = forms.CharField(label='First Name')
    last_name = forms.CharField(label='Last Name')
    email = forms.EmailField(label='Email')
    phone_number = forms.CharField(label='Phone Number', max_length=42, required=False)
    resume = forms.FileField()

    def save(self):
        # save data

class NewApplicationView(SuccessMessageMixin, FormView):

    template_name = 'applicants/new_application.html'
    form_class = NewApplicationForm
    success_url = reverse_lazy('applicants:add')
    success_message = "Job Application was created successfully"

    def form_valid(self, form):
        # This method is called when valid form data has been POSTed.
        # It should return an HttpResponse.
        form.save()
        return super(NewApplicationView, self).form_valid(form)

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我遇到的问题的一个例子是，如果我在jobs表中添加新行，那么新行在重新启动web服务器之前不会显示在form choice字段中。

这是因为表单字段是静态填充的，而不是动态填充的（即不是每次实例化表单时）。您应该在form

\uuu init\uu

方法中指定form queryset，如下所示：

class NewApplicationForm(forms.Form):
    id = JobsModelChoiceField(queryset=Job.objects.none(), ...)

...


    def __init__(self, *args, **kwargs):
        super(NewApplicationForm, self).__init__(*args, **kwargs)
        self.fields['id'].queryset = Job.objects.all()

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我很想知道为什么这个答案被否决而没有发表评论…：-？这是正确的答案，这是我的工作，我投赞成票，谢谢！