Hello,
According to docs, I can use class level methods and variables with
the ScopedSession:
Since theSession()
<http://www.sqlalchemy.org/docs/orm/session.html#sqlalchemy.orm.session.Session>constructor
now returns the sameSession
<http://www.sqlalchemy.org/docs/orm/session.html#sqlalchemy.orm.session.Session>object
every time within the current thread, the object returned
byscoped_session()
<http://www.sqlalchemy.org/docs/orm/session.html#sqlalchemy.orm.scoped_session>also
implements most of theSession
<http://www.sqlalchemy.org/docs/orm/session.html#sqlalchemy.orm.session.Session>methods
and properties at the "class" level, such that you don't even need to
instantiateSession()
<http://www.sqlalchemy.org/docs/orm/session.html#sqlalchemy.orm.session.Session>
However, when I tried this on 0.6.5 and 0.6.6 - it did not work. Looks
like not all expected variables are exposed, or they were renamed and
ScopedSession object was not behaving as would one expect from Session
object.
Basically, here is sample stack trace:
File
"C:\Python26\lib\site-packages\sqlalchemy-0.6.6-py2.6.egg\sqlalchemy\orm\query.py",
line 1646, in one
ret = list(self)
File
"C:\Python26\lib\site-packages\sqlalchemy-0.6.6-py2.6.egg\sqlalchemy\orm\query.py",
line 1688, in __iter__
self.session._autoflush()
AttributeError: 'ScopedSession' object has no attribute '_autoflush'
So, I decided to add all missing attributes by monkey patching the
ScopedSession class for now.
Essentially this did the trick:
def patch_sqlalchemy():
from sqlalchemy.orm.scoping import ScopedSession, makeprop
for prop in ('_autoflush', 'hash_key', '_finalize_loaded'):
setattr(ScopedSession, prop, makeprop(prop))
patch_sqlalchemy()
I don't know if it right solution, or class-level attributes are no
longer supported, etc.
Please advice.
Thank you,
Serge.
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