Ошибка входа в систему: Исключение Значение: Невозможно принудительное обновление в save() без первичного ключа

Я использую django с mongo db для создания сайта социальных сетей, но при входе в систему я столкнулся со следующей ошибкой:

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/signin

Django Version: 3.2.16
Python Version: 3.7.2
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'core']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/sparshbohra/django-social/django-social-media-website/core/views.py", line 230, in signin
    login(request, user)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/contrib/auth/__init__.py", line 135, in login
    user_logged_in.send(sender=user.__class__, request=request, user=user)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 182, in send
    for receiver in self._live_receivers(sender)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 182, in <listcomp>
    for receiver in self._live_receivers(sender)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/contrib/auth/models.py", line 22, in update_last_login
    user.save(update_fields=['last_login'])
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/contrib/auth/base_user.py", line 67, in save
    super().save(*args, **kwargs)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/db/models/base.py", line 740, in save
    force_update=force_update, update_fields=update_fields)
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/db/models/base.py", line 778, in save_base
    force_update, using, update_fields,
  File "/Users/sparshbohra/django-social/venv/lib/python3.7/site-packages/django/db/models/base.py", line 841, in _save_table
    raise ValueError("Cannot force an update in save() with no primary key.")

Exception Type: ValueError at /signin
Exception Value: Cannot force an update in save() with no primary key.

Мой views.py импортирует и функцию входа в систему:

from django.shortcuts import render, redirect
from django.contrib.auth.models import User, auth
from django.contrib.auth import authenticate, logout, login
from django.contrib import messages
from django.http import HttpResponse
from django.contrib.auth.decorators import login_required
from .models import Profile, Post, LikePost, FollowersCount
from itertools import chain
import random

def signin(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']

        user = authenticate(username=username, password=password)

        if user is not None:
            login(request, user)
            return redirect('/')
        else:
            messages.info(request, 'Credentials Invalid')
            return redirect('signin')

    else:
        return render(request, 'signin.html')

Мой models.py импортирует и модель пользователя:

from djongo import models
from django.contrib.auth import get_user_model
import uuid
from datetime import datetime

User = get_user_model()

settings.py:

DATABASES = {
    'default': {
        'ENGINE': 'djongo',
        'CLIENT': {
            'host': 'mongodb+srv://reunion:reunion@cluster0.21arjcf.mongodb.net/?retryWrites=true&w=majority',
            'name': 'reunion',
            'authMechanism': 'SCRAM-SHA-1' # for Atlas cloud db
        }
    }
}

Пожалуйста, скажите мне, почему я получаю эту ошибку и как ее исправить. Я уже пробовал makemigrations и migrate.

User = get_user_model()

def authenticate(request, username=None, password=None, **kwargs):
    _, _ = request, kwargs
    try:
        if User.objects.get(username=username).check_password(password):
            return user
    except User.DoesNotExist:
        pass
    return None 

from django.urls import path
from rest_framework_simplejwt import views as jwt_views


urlpatterns = [
    path('token/obtain/', jwt_views.TokenObtainPairView.as_view(), name='obtain_token'),
    path('token/refresh/', jwt_views.TokenRefreshView.as_view(), name='refresh_token'),
]