[Sqlalchemy-tickets] Issue #3836: potential 1.1 regression re: query (zzzeek/sqlalchemy)

[Michael B. <iss...@bi...>]

New issue 3836: potential 1.1 regression re: query
https://bitbucket.org/zzzeek/sqlalchemy/issues/3836/potential-11-regression-re-query

Michael Bayer:

looks like an illegal attribute access:

```
#!python


Traceback (most recent call last):
  File "barbican/tests/cmd/test_db_cleanup.py", line 32, in project_wrapper
    test_result = test_func(self, *args, **kwargs)
  File "barbican/tests/cmd/test_db_cleanup.py", line 291, in test_soft_deleting_expired_secrets
    clean.soft_delete_expired_secrets(current_time)
  File "barbican/model/clean.py", line 293, in soft_delete_expired_secrets
    update_count = _soft_delete_expired_secrets(threshold_date)
  File "barbican/model/clean.py", line 198, in _soft_delete_expired_secrets
    synchronize_session='fetch')
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 3286, in update
    update_op.exec_()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 1158, in exec_
    self._do_post_synchronize()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 1404, in _do_post_synchronize
    target_mapper = self.query._mapper_zero()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 294, in _mapper_zero
    return self._entities[0].mapper
AttributeError: '_ColumnEntity' object has no attribute 'mapper'
```
 
this is openstack barbican need to figure out what they are doing.  http://paste.debian.net/884819/