属性没有被传递到modelform构造函数，当modelformset_factory

Question

我有一个表单，我试图限制出现在字段'问题'（在这种情况下，我只想要用户创建的问题）的选择。这种方法与其他形式的工作，但它不工作这一次 - 可能是因为它是一个ModelFormset，而不仅仅是一个的ModelForm

确切的错误是 - “NoneType”对象有没有属性“用户名”，我怀疑这意味着'用户'对象没有被传递给AnswerForm的构造函数。问题是，我不知道为什么它没有被通过

#views.py 
def add_answer(request): 
     a_form = modelformset_factory(Answer, form=AnswerForm(user=request.user), fields='__all__', min_num=2, max_num=4, validate_min=True) 
     if request.method == "POST": 
      form = a_form(request.POST) 
      if form.is_valid(): 
       #Do something 
     return render(request, 'site/addanswer.html', {'a_form': a_form}) 

#forms.py 
class AnswerForm(forms.ModelForm): 

    def __init__(self, *args, **kwargs): 
     self.user = kwargs.pop('user', None) 
     super(AnswerForm, self).__init__(*args, **kwargs) 
     self.fields['question'] = forms.ModelChoiceField(queryset=Question.objects.filter(user__username=self.user.username)) 

    class Meta: 
     model = Answer 
     fields = ('question', 'answer', 'correct') 

#models.py 
class Question(models.Model): 
    user = models.ManyToManyField(User) 
    test = models.ForeignKey(Test, on_delete=models.CASCADE) 
    question = models.TextField(max_length=1000) 

    def __str__(self): 
     return "{0}".format(self.question) 

class Answer(models.Model): 
    question = models.ForeignKey(Question) 
    answer = models.TextField(max_length=1000) 
    correct = models.BooleanField() 

    def __str__(self): 
     return "{0}".format(self.answer) 

Answer 1

也许self.user通过super得到覆盖。也无需查询user.username。

#forms.py 
class AnswerForm(forms.ModelForm): 

    def __init__(self, *args, **kwargs): 
     user = kwargs.pop('user', None) 
     super(AnswerForm, self).__init__(*args, **kwargs) 
     self.fields['question'] = forms.ModelChoiceField(queryset=Question.objects.filter(user=user)) 

    class Meta: 
     model = Answer 
     fields = ('question', 'answer', 'correct')