屬性沒有被傳遞到modelform構造函數，當modelformset_factory

Question

我有一個表單，我試圖限制出現在字段'問題'（在這種情況下，我只想要用戶創建的問題）的選擇。這種方法與其他形式的工作，但它不工作這一次 - 可能是因爲它是一個ModelFormset，而不僅僅是一個的ModelForm

確切的錯誤是 - 「NoneType」對象有沒有屬性「用戶名」，我懷疑這意味着'用戶'對象沒有被傳遞給AnswerForm的構造函數。問題是，我不知道爲什麼它沒有被通過

#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

也許self.user通過super得到覆蓋。也無需查詢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')