id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 27544,F() Expressions updating dates in .update() field fails,Gary Graham,nobody,"Upon upgrading from 1.8 -> 1.10, I noticed that some code I had written now threw an error. Specifically, attempting to update datetime field's via F expression. Branch with test showing regression -> https://github.com/tadgh/django/commit/c31133261c68b10525b8e3b34e6895a0c6ece4d0 Bisected to ed83881e648771d22658f21b939f66e75c499864: Fixed #23820 -- Supported per-database time zone. Stacktrace from failure: {{{ ====================================================================== ERROR: test_F_expression_fails (timezones.test_regression.ProveRegression) ---------------------------------------------------------------------- Traceback (most recent call last): File ""/home/tadgh/Projects/django/tests/timezones/test_regression.py"", line 22, in test_F_expression_fails self.timestamp.refresh_from_db() File ""/home/tadgh/Projects/django/django/db/models/base.py"", line 585, in refresh_from_db db_instance = db_instance_qs.get() File ""/home/tadgh/Projects/django/django/db/models/query.py"", line 381, in get num = len(clone) File ""/home/tadgh/Projects/django/django/db/models/query.py"", line 240, in __len__ self._fetch_all() File ""/home/tadgh/Projects/django/django/db/models/query.py"", line 1061, in _fetch_all self._result_cache = list(self.iterator()) File ""/home/tadgh/Projects/django/django/db/models/query.py"", line 68, in __iter__ for row in compiler.results_iter(results): File ""/home/tadgh/Projects/django/django/db/models/sql/compiler.py"", line 806, in results_iter row = self.apply_converters(row, converters) File ""/home/tadgh/Projects/django/django/db/models/sql/compiler.py"", line 790, in apply_converters value = converter(value, expression, self.connection, self.query.context) File ""/home/tadgh/Projects/django/django/db/backends/sqlite3/operations.py"", line 159, in convert_datetimefield_value value = timezone.make_aware(value, self.connection.timezone) File ""/home/tadgh/Projects/django/django/utils/timezone.py"", line 364, in make_aware return timezone.localize(value, is_dst=is_dst) File ""/home/tadgh/.venvs/django_env/lib/python3.4/site-packages/pytz/__init__.py"", line 227, in localize raise ValueError('Not naive datetime (tzinfo is already set)') ValueError: Not naive datetime (tzinfo is already set) }}}",Bug,new,"Database layer (models, ORM)",1.10,Normal,,F(),,Unreviewed,0,0,0,0,0,0