Why I am getting “Not Implemented Error: Database objects do not implement truth value testing or bool().” while running makemigration cmd in django

I am trying to connect Django with MongoDB using Djongo. I have changed the Database parameter but I am getting this error Not Implemented Error: Database objects do not implement truth value testing or bool(). when I am running makemigration command.

Please can anybody explain why I am getting this error and how to resolve it?

I have include settings.py file, error log and mongodb compass setup image.

settings.py

"""
Django settings for Chatify project.

Generated by 'django-admin startproject' using Django 3.2.9.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""

from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-1k4mo05el_0112guspx^004n-i&3h#u4gyev#27u)tkb8t82_%'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'api.apps.ApiConfig',
]

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',
]

ROOT_URLCONF = 'Chatify.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'Chatify.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

# DATABASES = {
#     'default': {
#         'ENGINE': 'django.db.backends.sqlite3',
#         'NAME': BASE_DIR / 'db.sqlite3',
#     }
# }
DATABASES = {
       'default': {
           'ENGINE': 'djongo',
           'NAME': 'users',
       }
}


# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = '/static/'

# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

Error Log

File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangocoremanagement__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangocoremanagement__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangocoremanagementbase.py", line 367, in run_from_argv
    connections.close_all()
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangodbutils.py", line 213, in close_all
    connection.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangoutilsasyncio.py", line 33, in inner
    return func(*args, **kwargs)
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjangodbbackendsbasebase.py", line 294, in close
    self._close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagesdjongobase.py", line 208, in _close
    if self.connection:
  File "C:UsersDELLAppDataLocalProgramsPythonPython37libsite-packagespymongodatabase.py", line 829, in __bool__
    raise NotImplementedError("Database objects do not implement truth "
NotImplementedError: Database objects do not implement truth value testing or bool(). Please compare with None instead: database is not None

MongoDBCompass MongoDB Local Database Image

Answer

The problem is with the new version of pymongo (4.0 from 29.11.2021) which is not supported by Djongo 1.3.6. You need to install pymongo 3.12.1. I had the same problem 2 hours ago.