Question

我正在尝试将kwargs传递给我的forms.py文件，当表单加载时，我收到一条错误，说我的form_py文件中没有定义car_id。我知道这是因为下面的代码行，但我不知道如何解决它。

form = SelectCarModelForm（）

forms.py

def __init__(self, *args, **kwargs):
    self.car_id = kwargs.pop('car_id', None)
    super(SelectCarModelForm, self).__init__(*args, **kwargs)
    self.fields['car_model'] = forms.ModelChoiceField(
        empty_label = "Select a Model",
        queryset = CarModel.objects.filter(model=car_id),
        widget = Select(attrs={'class': 'span12 small-margin-top small-margin-bottom'}),
        required=True
    )

视图

    if request.method == "POST":

        form = SelectCarModelForm(request.POST)
        if form.is_valid():
            model = form.cleaned_data['car_model']




            # Go to the next form in the process.
            return redirect('view_car')


    # Initial form
    else:

        form = SelectCarModelForm()

    return render(
        request,
        template_name = 'cars/forms/view_car_models.html',
        dictionary = {
            'form':form,

        }
    )

Answer 1

你要么这样做：

# pass a `car_id` value when instantiating the form
form = SelectCarModelForm(car_id=<some_value>)

如果这不可行，也许这个：

def __init__(self, *args, **kwargs):
    self.car_id = kwargs.pop('car_id', None)
    super(SelectCarModelForm, self).__init__(*args, **kwargs)
    if self.car_id is not None:
        self.fields['car_model'] = forms.ModelChoiceField(
            empty_label = "Select a Model",
            queryset = CarModel.objects.filter(model=car_id),
            widget = Select(attrs={'class': 'span12 small-margin-top small-margin-bottom'}),
            required=True
        )
    else:
        self.fields['car_model'] = forms.ModelChoiceField(
            empty_label = "Select a Model",
            queryset = CarModel.objects.filter(model=<SOME-OTHER-CRITERIA),
            widget = Select(attrs={'class': 'span12 small-margin-top small-margin-bottom'}),
            required=True
        )

**之后的DeclarativeFieldsMetaclass对象参数必须是映射，而不是int

1 个答案: