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TypeError:__ init __()在Django Form&Formset中得到了一个意外的关键字参数

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"Passing custom parameters to formset forms"上关注Django文档后,我得到以下内容:

__init__() got an unexpected keyword argument 'choices'


File "/Users/emilepetrone/Envs/kishikoi/lib/python3.6/site-packages/django/utils/functional.py" in __get__
  35.         res = instance.__dict__[self.name] = self.func(instance)

File "/Users/emilepetrone/Envs/kishikoi/lib/python3.6/site-packages/django/forms/formsets.py" in forms
  144.                  for i in range(self.total_form_count())]

File "/Users/emilepetrone/Envs/kishikoi/lib/python3.6/site-packages/django/forms/formsets.py" in <listcomp>
  144.                  for i in range(self.total_form_count())]

File "/Users/emilepetrone/Envs/kishikoi/lib/python3.6/site-packages/django/forms/formsets.py" in _construct_form
  182.         form = self.form(**defaults)

File "/Users/emilepetrone/Sites/kishikoi/kishikoi/transactions/forms.py" in __init__
  119.         super(SoldTransactionForm, self).__init__(*args, **kwargs)

Exception Type: TypeError at /transactions/create/sell/transactions/31tmhqsplg41jc8c/
Exception Value: __init__() got an unexpected keyword argument 'choices'

这是我的观点,我按照文档并在formset form_kwargs中传递'choices' .

class SellTransactionsView(LoginRequiredMixin, SetHeadlineMixin, UpdateView):
    model = Transaction
    template_name = "transactions/soldtransaction_form.html"
    headline = "Sell Transaction"
    fields = ['num_shares']

    def get_object(self):
        return Transaction.objects.get(
            user=self.request.user,
            identifier=self.kwargs['identifier']
        )

    def get_choices(self):
        transaction = self.get_object()
        choices = Transaction.objects.filter(
            user=transaction.user,
        ).exclude(identifier=transaction.identifier)
        return choices

    def get_context_data(self, *args, **kwargs):
        context = super(SellTransactionsView, self).get_context_data(
            *args, **kwargs)
        choices = self.get_choices()
        formset = SoldFormset(form_kwargs={'choices': choices})
        context.update({
            "formset": formset,
        })
        return context

我的表单和表单集 - 我正在使用forms.Form,因为我将使用这些字段来更新form.is_valid()中的其他字段 .

class SoldTransactionForm(forms.Form):

    old_transaction = forms.ChoiceField()

    num_shares = forms.IntegerField(
        min_value=0
    )

    class Meta:
        fields = [
            'old_transaction',
            'num_shares',
        ]

    def __init__(self, *args, **kwargs):
        super(SoldTransactionForm, self).__init__(*args, **kwargs)
        self.fields['old_transaction'].queryset = kwargs.pop('choices')

SoldFormset = forms.formset_factory(
    SoldTransactionForm,
    formset=forms.BaseFormSet,
    extra=2
)

SOLUTION

对于其他人来说,kwargs.pop('choices')确实需要高于表格中的Super() . init

这解决了错误,但随后呈现了一个formset而没有在ChoiceField中加载数据 . 我将字段更改为ModelChoiceField并设置queryset = None(要在 init 中更改 . 这解决了问题 .

1 回答

  • 3

    在你致电 super 之前弹出:

    def __init__(self, *args, **kwargs):
    
            queryset = kwargs.pop('choices')
    
            super(SoldTransactionForm, self).__init__(*args, **kwargs)
    
            self.fields['old_transaction'].queryset = queryset
    

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