RuntimeError: Model class django.contrib.sessions.models.Session doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS

[khaliullin]

Does this library support Django 3.2.6?

I did the following steps according to documentation:

• In setting.py INSTALLED_APPS block I replaced django.contrib.sessions to user_sessions
• In setting.py MIDDLEWARE replaced django.contrib.sessions.middleware.SessionMiddleware to user_sessions.middleware.SessionMiddleware
• In setting.py added
  SESSION_ENGINE = 'user_sessions.backends.db'
SILENCED_SYSTEM_CHECKS = ['admin.E410']
• In projects main urls.py added path('', include('user_sessions.urls', namespace='user_sessions'))
  When I am making python manage.py migrate I get the following error:
  RuntimeError: Model class django.contrib.sessions.models.Session doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

Difference in versions

Latest version in release notes is 2.0.0
But in pypi.org the latest version is 1.7.1.

I have installed 1.7.1 using pip. How can I get the 2.0.0 version? Maybe this would fix the error I get.

• Python version: 3.8.10
• Django version: 3.2.6
• django-otp version:
• django-user-sessions version: 1.7.1

[WhyNotHugo]

Looks like you're trying to use django.contrib.sessions.models.Session, but this model is provided by the contrib-app that is replaced by this one.

Can you post the full traceback?

[khaliullin]

@WhyNotHugo
I removed default django session app and middleware.

Here is my full log

Starting the server

/user/app/.venv/bin/python /user/app/manage.py runserver 8000 
Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/integrations/threading.py", line 69, in run
    reraise(*_capture_exception())
  File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/_compat.py", line 54, in reraise
    raise value
  File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/integrations/threading.py", line 67, in run
    return old_run_func(self, *a, **kw)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/user/app/.venv/lib/python3.8/site-packages/django/core/management/commands/runserver.py", line 110, in inner_run
    autoreload.raise_last_exception()
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 87, in raise_last_exception
    raise _exception[1]
  File "/user/app/.venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute
    autoreload.check_errors(django.setup)()
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/user/app/.venv/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/user/app/.venv/lib/python3.8/site-packages/django/apps/registry.py", line 122, in populate
    app_config.ready()
  File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/apps.py", line 27, in ready
    self.module.autodiscover()
  File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/__init__.py", line 24, in autodiscover
    autodiscover_modules('admin', register_to=site)
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/module_loading.py", line 47, in autodiscover_modules
    import_module('%s.%s' % (app_config.name, module_to_search))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 848, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/user/app/landing/admin.py", line 13, in <module>
    from settings.admin import SettingsAdmin
  File "/user/app/settings/admin.py", line 39, in <module>
    class GlobalSettingsAdmin(SettingsAdmin):
  File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/decorators.py", line 100, in _model_admin_wrapper
    admin_site.register(models, admin_class=admin_class)
  File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 141, in register
    self._registry[model] = admin_class(model, self)
  File "/user/app/settings/admin.py", line 27, in __init__
    model.load()
  File "/user/app/core/models.py", line 3682, in load
    return cls.objects.get_or_create()[0]
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 581, in get_or_create
    return self.get(**kwargs), False
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 431, in get
    num = len(clone)
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 262, in __len__
    self._fetch_all()
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 1324, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 47, in __iter__
    db = queryset.db
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 1253, in db
    return self._db or router.db_for_write(self.model, **self._hints)
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/utils.py", line 239, in _route_db
    for router in self.routers:
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/utils.py", line 230, in routers
    router = import_string(r)()
  File "/user/app/.venv/lib/python3.8/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/user/app/main/dbrouters/primary_router.py", line 6, in <module>
    from django.contrib.sessions.models import Session
  File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/sessions/models.py", line 10, in <module>
    class Session(AbstractBaseSession):
  File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/base.py", line 113, in __new__
    raise RuntimeError(
RuntimeError: Model class django.contrib.sessions.models.Session doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

[WhyNotHugo]

On Sat, 24 Dec 2022, at 19:24, Sagit Khaliullin wrote: @WhyNotHugo <https://github.com/WhyNotHugo> I removed default django session app and middleware. Here is my full log Starting the server `/user/app/.venv/bin/python /user/app/manage.py runserver 8000 Watching for file changes with StatReloader Exception in thread django-main-thread: Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner self.run() File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/integrations/threading.py", line 69, in run reraise(*_capture_exception()) File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/_compat.py", line 54, in reraise raise value File "/user/app/.venv/lib/python3.8/site-packages/sentry_sdk/integrations/threading.py", line 67, in run return old_run_func(self, *a, **kw) File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run self._target(*self._args, **self._kwargs) File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 64, in wrapper fn(*args, **kwargs) File "/user/app/.venv/lib/python3.8/site-packages/django/core/management/commands/runserver.py", line 110, in inner_run autoreload.raise_last_exception() File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 87, in raise_last_exception raise _exception[1] File "/user/app/.venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute autoreload.check_errors(django.setup)() File "/user/app/.venv/lib/python3.8/site-packages/django/utils/autoreload.py", line 64, in wrapper fn(*args, **kwargs) File "/user/app/.venv/lib/python3.8/site-packages/django/__init__.py", line 24, in setup apps.populate(settings.INSTALLED_APPS) File "/user/app/.venv/lib/python3.8/site-packages/django/apps/registry.py", line 122, in populate app_config.ready() File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/apps.py", line 27, in ready self.module.autodiscover() File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/__init__.py", line 24, in autodiscover autodiscover_modules('admin', register_to=site) File "/user/app/.venv/lib/python3.8/site-packages/django/utils/module_loading.py", line 47, in autodiscover_modules import_module('%s.%s' % (app_config.name, module_to_search)) File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1014, in _gcd_import File "<frozen importlib._bootstrap>", line 991, in _find_and_load File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 671, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 848, in exec_module File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed File "/user/app/landing/admin.py", line 13, in <module> from settings.admin import SettingsAdmin File "/user/app/settings/admin.py", line 39, in <module> class GlobalSettingsAdmin(SettingsAdmin): File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/decorators.py", line 100, in _model_admin_wrapper admin_site.register(models, admin_class=admin_class) File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 141, in register self._registry[model] = admin_class(model, self) File "/user/app/settings/admin.py", line 27, in __init__ model.load() File "/user/app/core/models.py", line 3682, in load return cls.objects.get_or_create()[0] File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 581, in get_or_create return self.get(**kwargs), False File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 431, in get num = len(clone) File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 262, in __len__ self._fetch_all() File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 1324, in _fetch_all self._result_cache = list(self._iterable_class(self)) File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 47, in __iter__ db = queryset.db File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/query.py", line 1253, in db return self._db or router.db_for_write(self.model, **self._hints) File "/user/app/.venv/lib/python3.8/site-packages/django/db/utils.py", line 239, in _route_db for router in self.routers: File "/user/app/.venv/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__ res = instance.__dict__[self.name] = self.func(instance) File "/user/app/.venv/lib/python3.8/site-packages/django/db/utils.py", line 230, in routers router = import_string(r)() File "/user/app/.venv/lib/python3.8/site-packages/django/utils/module_loading.py", line 17, in import_string module = import_module(module_path) File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "/user/app/main/dbrouters/primary_router.py", line 6, in <module> from django.contrib.sessions.models import Session`

Your issue is on the above line. You’re importing the Session type from the Django app that’s being replaced by this one.

` File "/user/app/.venv/lib/python3.8/site-packages/django/contrib/sessions/models.py", line 10, in <module> class Session(AbstractBaseSession): File "/user/app/.venv/lib/python3.8/site-packages/django/db/models/base.py", line 113, in __new__ raise RuntimeError( RuntimeError: Model class django.contrib.sessions.models.Session doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

`

…

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[blag]

@khaliullin Any objections to closing this?

[WhyNotHugo]

My above message is garbled up, but to sumarise:

The error message ends with:

RuntimeError: Model class django.contrib.sessions.models.Session doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

This says django.contrib.sessions.models.Session. That's not the model provided by this library, it's the one provided by django.contrib.sessions. You're importing the wrong model.