Django2.1 : Queryset ModelChoice in a ModelForm 然后保存两个表单

Question

我希望当前登录的用户能够创建和保存这两个表单。第二种形式具有 ManyToManyField 和 ForeignKey 关系，如下所示。

目前，我已尝试从模型窗体查询当前用户ChatGroupUser。

使用当前的代码，一旦我尝试访问该页面，Django 就会引发以下错误：

__init__() missing 1 required positional argument: 'user'

它说错误来自第 88 行，即：

form_user = ChatGroupUserForm() 

完整回溯

Traceback (most recent call last):
File "/Users/macadmin/Documents/Django_fun4/Groupixx/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/Users/macadmin/Documents/Django_fun4/Groupixx/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/macadmin/Documents/Django_fun4/Groupixx/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/macadmin/Documents/Django_fun4/Groupixx/groupixx/core/views.py", line 88, in create_group
form_user = ChatGroupUserForm()
TypeError: __init__() missing 1 required positional argument: 'user'

models.py

class ChatGroup(models.Model):
name = models.CharField(max_length=100, blank=True, null=True)
group_admin = models.ForeignKey(User, on_delete=models.CASCADE, related_name='chat_group_admins')
is_active = models.BooleanField(default=True, null=True)
is_current = models.BooleanField(default=False, null=True)
class ChatGroupUser(models.Model):
user = models.ManyToManyField(User)
chat_group = models.ForeignKey(ChatGroup, on_delete=models.CASCADE, related_name='chat_group_users')

forms.py

from django.contrib.auth import get_user_model
User = get_user_model()
class ChatGroupForm(forms.ModelForm):
class Meta:
model = ChatGroup
fields = ['name',]
class ChatGroupUserForm(forms.ModelForm):
class Meta:
model = ChatGroupUser
fields = ['user']
def __init__(self, user, *args, **kwargs):
super(ChatGroupUserForm, self).__init__(*args, **kwargs)
self.fields['user'].queryset = User.objects.filter(user=user)

views.py

def create_group(request):
if request.method == 'POST':
form_group = ChatGroupForm(request.POST)
form_user = ChatGroupUserForm(request.POST)
if form_group.is_valid():
create_form = form_group.save(commit=False)
create_form.group_admin = request.user
create_form.save()
form_user.save(commit=False)
form_user.user = user
form_user.save()
return redirect('core:group_list')
else:
form_group = ChatGroupForm()
form_user = ChatGroupUserForm()
context = {
'form_group':form_group,
'form_user': form_user
}
return render(request, 'core/create-group.html', context)

我将不胜感激任何帮助，我不确定为什么 django 会抛出错误以及为什么我无法创建和保存这两种形式。

Answer 1

这是因为您的init函数具有参数user，
而您的视图没有通过user。

以下是在您的视图中修复它
的方法：
form_user = ChatGroupUserForm(user=request.user)

然后在您的表格中：

class ChatGroupUserForm(forms.ModelForm):
class Meta:
model = ChatGroupUser
fields = ['user']
def __init__(self, *args, **kwargs):
self.user = kwargs.pop('user')
super(ChatGroupUserForm, self).__init__(*args, **kwargs)
self.fields['user'].queryset = User.objects.filter(user=self.user)

希望它能:)