Объект формы UsertypeALogin не имеет атрибута get_user

У меня многопользовательское приложение с типами пользователей a и b. Я пытаюсь создать форму входа, используя представления на основе классов, делая большую часть моей логики лежащей в forms.py вот как выглядит мой код

forms.py

class UsertypeALogin(forms.Form):
    username = forms.CharField(required=True)
    password = forms.CharField(widget=forms.PasswordInput)

    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request', None)
        super().__init__(*args, **kwargs)

    def clean(self):
        username = self.cleaned_data.get("username")
        password = self.cleaned_data.get("password")
        try:
            user = models.User.objects.get(username=username)
            if user.user_a:
                if user.check_password(password):
                    return self.cleaned_data
                else:
                    self.add_error("password", forms.ValidationError("Password is wrong."))
        except models.User.DoesNotExist:
            self.add_error("email", forms.ValidationError("User does not exist."))

views.py

class UsertypeaView(LoginView):
    template_name = 'login.html'
    form_class = UsertypeALogin
    success_url = reverse_lazy("dash")

трассировка ошибки

Это ошибка, которую я получаю

 Internal Server Error: /app/pm/signin/
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/views/decorators/debug.py", line 89, in sensitive_post_parameters_wrapper
    return view(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/contrib/auth/views.py", line 63, in dispatch
    return super().dispatch(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/views/generic/edit.py", line 142, in post
    return self.form_valid(form)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/contrib/auth/views.py", line 92, in form_valid
    auth_login(self.request, form.get_user())
AttributeError: 'UsertypeALogin' object has no attribute 'get_user'
[12/Dec/2021 17:46:39] "POST /signin/ HTTP/1.1" 500 109571

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