Question

根据Django文档，ChoiceField接受an iterable of two tuples, "or a callable that returns such an iterable"作为该字段的选择。

我已在表单中定义ChoiceFields：

class PairRequestForm(forms.Form):
    favorite_choices = forms.ChoiceField(choices=[], widget=RadioSelect, required=False)

以下是我尝试传递自定义选项元组的视图：

class PairRequestView(FormView):
    form_class = PairRequestForm

    def get_initial(self):
        requester_obj = Profile.objects.get(user__username=self.request.user)
        accepter_obj = Profile.objects.get(user__username=self.kwargs.get("username"))

        # `get_favorites()` is the object's method which returns a tuple.
        favorites_set = requester_obj.get_favorites()

        initial = super(PairRequestView, self).get_initial()

        initial['favorite_choices'] = favorites_set

        return initial

在我的models.py中，这是上面使用的返回元组的方法：

def get_favorites(self):
        return (('a', self.fave1), ('b', self.fave2), ('c', self.fave3))

根据我的理解，如果我想预先填充表单，我会通过覆盖get_initial()来传递数据。我尝试使用可调用的方式设置表单favorite_choices的初始数据。可调用的是favorites_set。

使用当前代码，我收到错误'tuple' object is not callable

如何根据自己的选择预先填充RadioSelect ChoiceField？

编辑：我还尝试设置initial['favorite_choices'].choices = favorites_set

Answer 1

使用get_initial方法填充表单字段的初始值。不要设置可用的choices或修改字段属性。

要成功将您的选择从视图传递到表单，您需要在视图中实现get_form_kwargs方法：

class PairRequestView(FormView):
    form_class = PairRequestForm

    def get_form_kwargs(self):
        """Passing the `choices` from your view to the form __init__ method"""

        kwargs = super().get_form_kwargs()

        # Here you can pass additional kwargs arguments to the form.
        kwargs['favorite_choices'] = [('choice_value', 'choice_label')]

        return kwargs

在您的表单中，从__init__方法中的kwargs参数中选择并在字段上设置选项：

class PairRequestForm(forms.Form):

    favorite_choices = forms.ChoiceField(choices=[], widget=RadioSelect, required=False)

    def __init__(self, *args, **kwargs):
        """Populating the choices of  the favorite_choices field using the favorites_choices kwargs"""

        favorites_choices = kwargs.pop('favorite_choices')

        super().__init__(*args, **kwargs)

        self.fields['favorite_choices'].choices = favorites_choices

瞧！

Answer 2

另一种简单的方法是：

class PairRequestView(FormView):
    form_class = PairRequestForm

    def get_form(self, *args, **kwargs):
         requester_obj = Profile.objects.get(user__username=self.request.user)
         favorites_set = requester_obj.get_favorites()
         form = super().get_form(*args, **kwargs)
         form.fields['favorite_choices'].choices = favorites_set
         return form

Answer 3

您应该将选择内容封装在表单构造者的适当参数中。假设您有一个“组”下拉菜单，并且想传递“组选择”：

class CreateAccountForm(forms.Form):

   def __init__(self, groupChoices_, *args, **kwargs):
      super(CreateAccountForm, self).__init__(*args, **kwargs)
      self.fields['group'].choices = groupChoices_

   group = forms.ChoiceField()

在您看来，始终将groupChoices_用作第一个参数，例如：

groupChoices = [
  (2, 'A'),
  (4, 'B'),
]
form = CreateAccountForm(groupChoices, request_.POST)

无需担心kwargs的可怕性！

从View中，我如何通过自定义＆＃34;选择＆＃34;进入一个表格的ChoiceField？

3 个答案: