Actually, I think the problem here is that ObjectStore extends
SessionContext but it proxies all attribute access to the current
session. I was actually surprised that the implementation of
ObjectStore.__getattr__ even works that way (the reasons for my
suspicions are a bit convoluted so I won't go into detail here).
I think we should change ObjectStore to use containment rather than
extension. Here's an alternate impl that should work (untested):
class ObjectStore(object):
def __init__(self, *args, **kwargs):
self._context = SessionContext(*args, **kwargs)
def __getattr__(self, name):
return getattr(self._context.current, name)
This makes ObjectStore a proxy to the thread-local session
(objectstore is what session evolved from) rather than both a session-
proxy and a SessionContext at the same time.
~ Daniel
On Jun 30, 2006, at 12:35 PM, Michael Bayer wrote:
> take a look at SessionContext (source code as well as docs on the
> site). "current" is a property accessor that hits a registry
> function; it creates the session via a callable function passed to
> its constructor. there should never be a case where no session is
> available since it knows how to create one if needed.
>
>
> On Jun 30, 2006, at 12:11 PM, Charles Duffy wrote:
>
>> After seeing some infinite-recursion issues, I modified
>> activemapper.Objectstore as follows:
>>
>> class Objectstore(SessionContext):
>> def __getattr__(self, key):
>> assert hasattr(self, 'current'), 'No session-specific
>> context
>> object available'
>> return getattr(self.current, key)
>> def get_session(self):
>> return self.current
>>
>> I'm now seeing the following exception:
>>
>> Traceback (most recent call last):
>> File
>> "/pkgs/Python-2.4.2/lib/python2.4/site-packages/CherryPy-2.2.1-
>> py2.4.egg/cherrypy/_cpserver.py",
>> line 78, in _start
>> Engine._start(self)
>> File
>> "/pkgs/Python-2.4.2/lib/python2.4/site-packages/CherryPy-2.2.1-
>> py2.4.egg/cherrypy/_cpengine.py",
>> line 108, in _start
>> func()
>> File "/home/ccd/VC/turbogears/turbogears/startup.py", line 222, in
>> startTurboGears
>> ext.start_extension()
>> File "/home/ccd/VC/turbogears/turbogears/visit/api.py", line
>> 64, in
>> start_extension
>> _manager= _create_visit_manager( timeout )
>> File "/home/ccd/VC/turbogears/turbogears/visit/api.py", line
>> 47, in
>> _create_visit_manager
>> plugin= entrypoint.load()
>> File
>> "/pkgs/Python-2.4.2/lib/python2.4/site-packages/setuptools-0.6a11-
>> py2.4.egg/pkg_resources.py",
>> line 1830, in load
>> entry = __import__(self.module_name, globals(),globals(),
>> ['__name__'])
>> File "/home/ccd/VC/turbogears/turbogears/visit/savisit.py", line
>> 64, in ?
>> class TG_Visit(ActiveMapper):
>> File "/home/ccd/VC/sqlalchemy/lib/sqlalchemy/ext/activemapper.py",
>> line 229, in __init__
>> assign_mapper(objectstore, cls, cls.table)
>> File "/home/ccd/VC/sqlalchemy/lib/sqlalchemy/ext/assignmapper.py",
>> line 31, in assign_mapper
>> extension = ctx.mapper_extension
>> File "/home/ccd/VC/sqlalchemy/lib/sqlalchemy/ext/
>> sessioncontext.py",
>> line 39, in _get_mapper_extension
>> return self._extension
>> File "/home/ccd/VC/sqlalchemy/lib/sqlalchemy/ext/activemapper.py",
>> line 24, in __getattr__
>> assert hasattr(self, 'current'), 'No session-specific context
>> object available'
>> AssertionError: No session-specific context object available
>>
>>
>> So... somehow, I'm not getting a current object in my Objectstore.
>> How
>> and where is this supposed to be created?
>>
>>
>> Using Tomcat but need to do more? Need to support web services,
>> security?
>> Get stuff done quickly with pre-integrated technology to make your
>> job easier
>> Download IBM WebSphere Application Server v.1.0.1 based on Apache
>> Geronimo
>> http://sel.as-us.falkag.net/sel?
>> cmd=lnk&kid=120709&bid=263057&dat=121642
>> _______________________________________________
>> Sqlalchemy-users mailing list
>> Sqlalchemy-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/sqlalchemy-users
>
>
> Using Tomcat but need to do more? Need to support web services,
> security?
> Get stuff done quickly with pre-integrated technology to make your
> job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?
> cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Sqlalchemy-users mailing list
> Sqlalchemy-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/sqlalchemy-users
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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