[Sqlalchemy-tickets] Issue #3143: UnicodeEncodeError in StatementError (zzzeek/sqlalchemy)

[kodemi <iss...@bi...>]

New issue 3143: UnicodeEncodeError in StatementError
https://bitbucket.org/zzzeek/sqlalchemy/issue/3143/unicodeencodeerror-in-statementerror

kodemi:

My models contains unicode fields. From time to time I get this error when quering records:

```
#!python

File "/usr/local/services/app/flights_handler.py", line 99, in fetch_flights_from_db
    flights = self.session.query(Flight).all()
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2286, in all
    return list(self)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2398, in __iter__
    return self._execute_and_instances(context)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2411, in _execute_and_instances
    close_with_result=True)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2402, in _connection_from_session
    **kw)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 843, in connection
    close_with_result=close_with_result)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 847, in _connection_for_bind
    return self.transaction._connection_for_bind(engine)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 298, in _connection_for_bind
    self._assert_active()
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 210, in _assert_active
    % self._rollback_exception
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/exc.py", line 242, in __str__
    repr(self.statement), repr(params_repr)
  File "/home/fidsadm/.virtualenvs/vipport-services/local/lib/python2.7/site-packages/sqlalchemy/sql/util.py", line 254, in __repr__
    return repr(self.params)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-8: ordinal not in range(128)
```