为什么这个django形式无效？

Question

为什么这个表格没有验证？它甚至没有调用该clean()方法.

forms.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没有调用该clean()方法.我有另一种几乎相同的形式,它有效.在我print dir(self.sample_form)通过该request.POST词典后,当我这样做时,它说明了这一点validation=unknown.为什么是这样？如何查看未验证的原因？

Answer 1

你需要传递*args和**kwargs当你调用super():

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

此刻,呼叫__init__没有任何*args或**kwargs等同于呼叫data=None.表单未绑定,因此永远无效.