hi there,
I am using sqlalchemy 0.5.3
with the following declaration:
# membership
class tblMembershiptype(Base2):
__table__ = tables2["tblMembershiptype"]
company_members = relation(
tblCompany,
secondary=tables2["tblMembership"],
backref='membershiptyp',
)
person_members = relation(
tblPerson,
secondary=tables2["tblMembership"],
backref='membershiptyp',
)
I get a traceback as follows, pretending that
tblMembershiptype.person_members': property of that name exists on mapper
'Mapper|tblPerson|tblPerson'
why is that so? I add the relation to two different tables, so the backref
should not be added to the same class.
thanks for any help
robert
Traceback (most recent call last):
File "transfer.py", line 803, in ?
main()
File "transfer.py", line 774, in main
updateProfileMembership()
File "transfer.py", line 664, in updateProfileMembership
h = tblTeveHandler(howmany=1000)
File "transfer.py", line 427, in __init__
q = self.tevesession.query(tblTeve)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/session.py",
line 908, in query
return self._query_cls(entities, self, **kwargs)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/query.py",
line 95, in __init__
self.__setup_aliasizers(self._entities)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/query.py",
line 109, in __setup_aliasizers
mapper, selectable, is_aliased_class = _entity_info(entity)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/util.py",
line 466, in _entity_info
mapper = class_mapper(entity, compile)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/util.py",
line 543, in class_mapper
mapper = mapper.compile()
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/mapper.py",
line 679, in compile
mapper._post_configure_properties()
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/mapper.py",
line 701, in _post_configure_properties
prop.init(key, self)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/interfaces.py",
line 404, in init
self.do_init()
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/properties.py",
line 579, in do_init
self._post_init()
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/properties.py",
line 838, in _post_init
self.backref.compile(self)
File
"/usr/local/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc4-py2.4.egg/sqlalchemy/orm/properties.py",
line 995, in compile
raise sa_exc.ArgumentError("Error creating backref '%s' on relation '%s': "
sqlalchemy.exc.ArgumentError: Error creating backref 'membershiptyp' on relation
'tblMembershiptype.person_members': property of that name exists on mapper
'Mapper|tblPerson|tblPerson'
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