Hi, I upgraded from Django 1.7.x to 1.9.5 and now get sporadic errors like this that come from the django.contrib.sessions module (the full stack trace is below):
Exception Type: ValueError at /subscriptions/ Exception Value: make_aware expects a naive datetime, got 2016-04-21 23:26:19.247888+00:00 Sporadic in the sense that when I visit the site and get the error, I can refresh and it is gone. If I wait for a while (e.g. the next day) and go to the site again, the error is back once and then goes away again if I refresh. I haven't figured out the timespan I need to wait before the error reappears yet, but assume it has to do with caching. I think it cannot be a problem with my own code, as the stack trace only contains stock Django functionality and my own code doesn't directly access or meddle with the Session models. If I understand correctly, Session objects are selected from the database with a filter on their expire_date, and at some point, this expire_date datetime object should be converted from native to aware, which fails because it is aware already. My first assumption was that there was a change from Django 1.7 to 1.9 and that the objects already saved in the database with Django 1.7 code are no longer compatible with Django 1.9. So I deleted all Session objects from the database and then start a new session by logging in again. However, the resulting Session object also has an expire_date which is aware already, so it would run into the same problem again. I use sqlite as the database backend, if that's relevant. Any idea what the problem might be? Thanks in advance! Jens -- ValueError at /subscriptions/ make_aware expects a naive datetime, got 2016-04-21 23:26:19.247888+00:00 Request Method: GET Request URL: https://.../subscriptions/ Django Version: 1.9.5 Python Executable: /usr/bin/python Python Version: 2.7.3 Python Path: ['/root/.virtualenvs/django19/lib/python2.7/site-packages', '/var/www/MYAPP', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/pymodules/python2.7'] Server time: Fri, 15 Apr 2016 21:02:49 +0200 Installed Applications: ('django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django.contrib.sites', 'MYAPP', 'django_extensions', 'debug_toolbar') Installed Middleware: ('django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware') Traceback: File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 149. response = self.process_exception_by_middleware(e, request) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 147. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view 22. if test_func(request.user): File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in <lambda> 46. lambda u: u.is_authenticated(), File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/utils/functional.py" in inner 204. self._setup() File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/utils/functional.py" in _setup 351. self._wrapped = self._setupfunc() File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/middleware.py" in <lambda> 22. request.user = SimpleLazyObject(lambda: get_user(request)) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/middleware.py" in get_user 10. request._cached_user = auth.get_user(request) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/__init__.py" in get_user 167. user_id = _get_user_session_key(request) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/auth/__init__.py" in _get_user_session_key 59. return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY]) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py" in __getitem__ 48. return self._session[key] File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py" in _get_session 198. self._session_cache = self.load() File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/contrib/sessions/backends/db.py" in load 33. expire_date__gt=timezone.now() File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/manager.py" in manager_method 122. return getattr(self.get_queryset(), name)(*args, **kwargs) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/query.py" in get 381. num = len(clone) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/query.py" in __len__ 240. self._fetch_all() File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all 1074. self._result_cache = list(self.iterator()) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/query.py" in __iter__ 68. for row in compiler.results_iter(results): File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in results_iter 808. row = self.apply_converters(row, converters) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in apply_converters 792. value = converter(value, expression, self.connection, self.query.context) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/db/backends/sqlite3/operations.py" in convert_datetimefield_value 216. value = timezone.make_aware(value, self.connection.timezone) File "/root/.virtualenvs/django19/lib/python2.7/site-packages/django/utils/timezone.py" in make_aware 369. "make_aware expects a naive datetime, got %s" % value) Exception Type: ValueError at /subscriptions/ Exception Value: make_aware expects a naive datetime, got 2016-04-21 23:26:19.247888+00:00 -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/3b385124-3df2-4f89-bce7-65d10e61bf93%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
