__init __（）在使用get_form_kwargs时获得了一个意想不到的关键字参数 [英] __init__() got an unexpected keyword argument when using get_form_kwargs

问题描述

作为表单向导的一部分，我试图将表单向导中的get_form_kwargs方法的参数传递给我的表单，然后再转到模型模型。我已经看了很多关于SO的例子（例如这里，此处和此处）

as part of a form wizard I'm trying to pass an argument from the get_form_kwargs method within form wizard to my form, and then onto a modelformset. I've looked at numerous examples on SO (e.g. here, here and here)

代码看起来对我好（初学者），但它仍然产生这个错误：

The code looks ok to me (beginner), but it's still generating this error:

异常类型：TypeError

异常值：__init __（）得到一个意想不到的关键字参数'parent'

相关的views.py提取：

relevant views.py extract:

def get_form_kwargs(self, step=None):
        kwargs = {}
        if self.steps.current == 'assign_child':
            kwargs = super(checkout, self).get_form_kwargs(step)
            kwargs.update({
                'parent': self.request.user,
                })
            return kwargs

forms.py摘录：

forms.py extract:

class bindBookingItems(ModelForm):
    class Meta:
        model = BookingItem
        fields = ('assignedKids',)
        widgets = {
                    'assignedKids': Select(attrs={'class': 'form-control',}),
            }
    def __init__(self, *args, **kwargs):
        parent = kwargs.pop('parent', None)
        super(bindBookingItems, self).__init__(*args, **kwargs)
        form.fields['assignedKids'].queryset = getChildren(parent.id)

checkout_bindBookingItemsFormSet = modelformset_factory(
        BookingItem, 
        form = bindBookingItems, 
        fields=('assignedKids', ),
        extra=0, max_num=5, can_delete=False)

我目前的想法是，这个问题在forms.py的某个地方。自从抱怨以来，这个争论显然是被接受的。但是，我认为我在超级声明之前正确地弹出kwarg。

My current thinking is that the problem lies somewhere in forms.py. The argument is obviously being picked up since it's complaining about it. However, I think i'm popping the kwarg correctly before the super statement.

我做错了什么？

更新的问题是，混合中有一个模型模型。请放弃此信息。

更新为追溯：

Traceback:
File "D:\Python27\Lib\site-packages\django\core\handlers\base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "D:\Python27\Lib\site-packages\django\views\generic\base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)
File "D:\Python27\Lib\site-packages\django\contrib\formtools\wizard\views.py" in dispatch
  237.         response = super(WizardView, self).dispatch(request, *args, **kwargs)
File "D:\Python27\Lib\site-packages\django\views\generic\base.py" in dispatch
  87.         return handler(request, *args, **kwargs)
File "D:\Python27\Lib\site-packages\django\contrib\formtools\wizard\views.py" in get
  255.         return self.render(self.get_form())
File "D:\Python27\Lib\site-packages\django\contrib\formtools\wizard\views.py" in get_form
  419.         return form_class(**kwargs)
File "D:\Python27\Lib\site-packages\django\forms\models.py" in __init__
  558.         super(BaseModelFormSet, self).__init__(**defaults)

Exception Type: TypeError at /checkout/
Exception Value: __init__() got an unexpected keyword argument 'parent'

推荐答案

这是一个辉煌示例说明如何正确覆盖 get_form_kwargs 。

Here is a brilliant example illustrating how to correctly override get_form_kwargs.

我很困惑，因为我找不到SO的下降例子到目前为止。

I was very confused since I could not find a descent example in S.O. so far.

假设这种形式：

from django import forms

from .models import MyModel


class MyForm(forms.ModelForm):

    class Meta:
        model = MyModel

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

        # set the user_id as an attribute of the form
        self.user_id = user_id

现在窗体被定义，视图需要从django.views.generic导入注入用户标识的表单：

Now that the form is defined, the view needs to inject the form with the user id:

from django.views.generic import UpdateView

# this assumes that django-braces is installed
from braces.views import LoginRequiredMixin

from .forms import MyForm
from .models import MyModel


class MyUpdateView(LoginRequiredMixin, UpdateView):
    model = MyModel
    form_class = MyForm
    success_url = "/someplace/"

    def get_form_kwargs(self):
        """This method is what injects forms with their keyword
            arguments."""
        # grab the current set of form #kwargs
        kwargs = super(MyUpdateView, self).get_form_kwargs()
        # Update the kwargs with the user_id
        kwargs['user_id'] = self.request.user.pk
        return kwargs

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