I've been trying to migrate my code to to 0.4 and I'm getting stuck on
this error. I haven't been able to narrow down what property of my
schema or code triggers this, but I thought I'd ask the group in case
there was an easy answer.
Here Thing is a class that is mapped to a table with a single column.
It has a relation to an attribute table with (thing_id, key, value)
columns. I have a subclass of Thing called Server, that instead of
mapping directly to the table maps to a select on the thing table
where the thing has certain attributes from the attribute table. If I
create a Server then add attributes to it then flush the data I get no
errors. But if I try to query for a Server to which I tried to add
attributes I get the attached error. Adding attributes straight to
Things or querying for Servers that I didn't add attributes to does
not produce the error.
Not sure if any of that was clear, but it's a start. Any ideas?
-Ron
return Thing.query.filter(Thing.c.name == name).one()
File "/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.4.0-
py2.4.egg/sqlalchemy/orm/query.py", line 605, in one
ret = list(self[0:2])
File "/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.4.0-
py2.4.egg/sqlalchemy/orm/query.py", line 619, in __iter__
return self._execute_and_instances(context)
File "/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.4.0-
py2.4.egg/sqlalchemy/orm/query.py", line 624, in
_execute_and_instances
return iter(self.instances(result, querycontext=querycontext))
File "/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.4.0-
py2.4.egg/sqlalchemy/orm/query.py", line 685, in instances
context.attributes.get(('populating_mapper', instance),
object_mapper(instance))._post_instance(context, instance)
File "/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.4.0-
py2.4.egg/sqlalchemy/orm/mapper.py", line 1534, in _post_instance
post_processors = selectcontext.attributes[('post_processors',
self, None)]
KeyError: ('post_processors', <sqlalchemy.orm.mapper.Mapper object at
0xb78a18cc>, None)
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