python - 为什么这个 django 表单无效？

Question

为什么此表单未通过验证？它甚至没有调用 clean() 方法。

表单.py:

class SingleSampleForm(forms.Form):

    sample_id = forms.CharField(label='Sample ID:')

    class Meta:
        fields = ('sample_id',)

    def __init__(self, *args, **kwargs):
        super(SingleSampleForm, self).__init__()

        self.helper = FormHelper()
        self.helper.layout = Layout(
            Field('sample_id',
            css_class="search-form-label",),
            Submit('submit', 'Search sample', css_class='upload-btn')
        )

        self.helper.form_method = 'POST'


    def clean(self):
        print('CLEAN')
        sample_id = self.cleaned_data['sample_id']
        if sample_id:
            return sample_id
        raise ValidationError('This field is required')

views.py:

class SampleView(View):

    sample_form = SingleSampleForm

    def get(self, request, *args, **kwargs):

        sample_form = self.sample_form()

        self.context = {'sample_form': sample_form,}

        return render(request,
                    'results/single_sample_search.html',
                    self.context)


    def post(self, request, *args, **kwargs):

        self.sample_form = self.sample_form(request.POST)

        if self.sample_form.is_valid():
            print('Valid')
        else:
            print('not valid')

        self.context = {
                'sample_form': self.sample_form,
            }


        return render(request,
                'results/single_sample_search.html',
                self.context)

我不明白为什么它甚至不调用 clean() 方法。我有另一种几乎相同的形式可以验证。当我在通过 request.POST 指令后执行 print dir(self.sample_form) 时，它指出 validation=unknown。为什么是这样？如何检查未验证的原因？

Answer 1

调用super()时需要传递*args和**kwargs:

def __init__(self, *args, **kwargs):
    super(SingleSampleForm, self).__init__(*args, **kwargs)

目前，不带任何*args 或**kwargs 调用__init__ 相当于调用data=None。表单未绑定(bind)，因此永远不会有效。