/ 'AnonymousUser' 对象的 AttributeError 没有属性 '_meta'

Question

I was trying to use signin page but this error shows up.

Image of error while running in Mozilla web browser localhost

I had tried the solution using this link and ended up mixing auth model to the chatbot model.

this is the link of my whole views.py file of chatbot app.

https://pastebin.com/2E7mgyuR

    def get(self, request):
        return render(request, 'chatbot/signin.html')

    def post(self, request):
        context = {
            'data': request.POST,
            'has_error': False
        }
        username = request.POST.get('username')
        password = request.POST.get('pass1')
        if username == '':
            messages.add_message(request, messages.ERROR,
                                 'Username is required')
            context['has_error'] = True
        if password == '':
            messages.add_message(request, messages.ERROR,
                                 'Password is required')
            context['has_error'] = True
        user = authenticate(request, username=username, password=password)

        # if not user and not context['has_error']:
        #     messages.add_message(request, messages.ERROR, 'Invalid login')
        #     context['has_error'] = True

        if context['has_error']:
            return render(request, 'chatbot/signin.html', status=401, context=context)
        login(request, user)
        return redirect('chatpage')

and This is my models.py of chatbot

from django.db import models
from django.contrib.auth import get_user_model
# Create your models here.

Mod = get_user_model()

class User(Mod):
    is_email_verified = models.BooleanField(default=False)

def __str__(self):
    return self.email

and this is what it is showing in terminal

Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
June 27, 2022 - 09:27:56
Django version 4.0.5, using settings 'Eva_Chatbot.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
[27/Jun/2022 09:28:04] "GET / HTTP/1.1" 200 64086
Internal Server Error: /
Traceback (most recent call last):
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/views/generic/base.py", line 84, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/views/generic/base.py", line 119, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/aman/Documents/chatbotEva/Eva_Chatbot/chatbot/views.py", line 141, in post
    login(request, user)
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/contrib/auth/__init__.py", line 138, in login
    request.session[SESSION_KEY] = user._meta.pk.value_to_string(user)
  File "/home/aman/anaconda3/envs/chatbot/lib/python3.10/site-packages/django/utils/functional.py", line 259, in inner
    return func(self._wrapped, *args)
AttributeError: 'AnonymousUser' object has no attribute '_meta'
[27/Jun/2022 09:28:09] "POST / HTTP/1.1" 500 83583

What causing this error? and How to solve this?

and also my email verification is also not working for some reason I had tried solving it and ended with this error. If anybody know any kind of tutorial for this or email verification for forgot password page please comment the link.

Answer 1

It is because you try to login(request, user) even if authenticate returns None instead of User object. Simpliest fix is:

if not user:
    # render/redirect as you please - user=None means that given credentials didn't pass to any User
else:
    login(request, user)