Django：从CBV表单视图传递数据以形成CBV [英] Django: pass data from CBV form view to form CBV

问题描述

我有表单与 ModelChoiceField ，它被用作 form_class 在 FormView 中。

I have Form with a ModelChoiceField, which is being used as the form_class in a FormView.

选择字段必须填充绑定到请求对象。

The choice field has to be populated with information bound to the request object.

总结一下：

class MyFormView(FormView):
    # I need to pass `request.user` and a value 
    # derived from `request.GET['pk']` to the form
    form_class = MyForm

class MyForm(Form):
    choices = ModelChoiceField(queryset=MyChoice.objects.none())

    def __init__(self, user, number, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.fields['choices'] = MyChoice.objects(number=number, owner=user)

我需要做什么才能将数据传递给创建实例时的形式？

What would I need to do to pass that data to the form when its instance is created?

我尝试覆盖 get_form 但我不确定他是正确的方法：

I tried overriding get_form but I am unsure this is the proper way of doing this:

 def get_form(self, form_class):
        user = self.request.user
        number = SomeModel.objects.get(self.GET['pk']).number
        return form_class(user, number, **self.get_form_kwargs())

推荐答案

覆盖 get_form ，但更好的方法是覆盖 get_form_kwargs ，以便您不必从 get_form 方法

Overriding get_form would work, but a better approach would be to override get_form_kwargs, so that you don't have to duplicate code from the get_form method.

class MyFormView(FormView):
    form_class = MyForm

    def get_form_kwargs(self):
        kwargs = super(MyFormView, self).get_form_kwargs()
        kwargs['user'] = self.request.user
        kwargs['number'] = SomeModel.objects.get(self.GET['pk']).number
        return kwargs

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