ModelType中的ForeignKey上的Queryset過濾

Question

保存模型表單時出現了一個奇怪的問題。我有一個表單，它由兩個模型表單組成，我試圖同時保存它們。爲了清楚起見，下面是我的代碼

Views.py

def create_user(request): 
    if request.method == 'POST': 
     user_form = UserForm(request.POST) 
     my_user_form = MyUsersForm(request.POST) 

     if user_form.is_valid() and my_user_form.is_valid(): 
      us = user_form.save() 
      my_us = my_user_form.save(commit=False) 
      my_us.user = us 
      my_us.save() 
      return HttpResponse('You have successfully created a user') 
     else: 
      return HttpResponse(' My_user_form is not validated') 

    else: 
     user_form = UserForm() 
     my_user_form = MyUsersForm(user=request.user) 
     return render(request, 'create_user.html', {'user_form': user_form, 'my_user_form': my_user_form}) 

當我重寫MyUsersForm的初始化方法來篩選外鍵的查詢集（CREATED_BY）my_user_form沒有得到證實，但在我不過濾查詢集，my_user_form被驗證，表單被保存。

我不明白的是，當我不過濾查詢集怎麼來my_user_form驗證？

通過request.post發送到my_user_form的數據在某種程度上丟失了（當我過濾查詢集時）。任何線索正確的方向是高度讚賞。感謝您提供寶貴意見。

Forms.py

class MyUsersForm(ModelForm): 

    class Meta: 
     model = MyUsers 
     fields = ['created_by', ] 

    def __init__(self, user=None, **kwargs): 
     super(MyUsersForm, self).__init__(**kwargs) 
     if user is not None: 
      self.fields['created_by'].queryset = User.objects.filter(username=user) 

Models.py

class MyUsers(models.Model): 
    user = models.OneToOneField(User, blank=True, null=True) 
    created_by = models.ForeignKey(User, related_name="created_by", blank=True, null=True) 

Answer 1

爲什麼my_user_form未通過驗證並保存。而不是在初始化修改查詢集我做到了在視圖本身使用語句

my_user_form.fields['created_by'] = forms.ModelChoiceField(User.objects.filter(username=request.user)) 

，這解決了我的問題。但我仍然不知道爲什麼它在MyUsersForm的init方法中不起作用？

Answer 2

def create_user(request): 
    if request.method == 'POST': 
     user_form = UserForm(request.POST) 
     my_user_form = MyUsersForm(request.POST) 

     if user_form.is_valid() and my_user_form.is_valid() and User.objects.filter(username=request.POST.get('user')).exists(): 
      us = user_form.save() 
      my_us = my_user_form.save(commit=False) 
      my_us.user = us 
      my_us.save() 
      return HttpResponse('You have successfully created a user') 
     else: 
      return HttpResponse(' My_user_form is not validated') 

    else: 
     user_form = UserForm() 
     my_user_form = MyUsersForm(user=request.user) 
     return render(request, 'create_user.html', {'user_form': user_form, 'my_user_form': my_user_form})