its a bug, there's an isinstance(str) that should be
isinstance(basestring). please file a trac ticket.
On Mar 2, 2009, at 6:26 PM, Karlo Lozovina wrote:
>
> Hi guys! Here goes the code sample:
>
>
> from sqlalchemy import create_engine, MetaData
> from sqlalchemy import Table, Column, ForeignKey, Integer
> from sqlalchemy.orm import sessionmaker, mapper, relation
>
> metadata = MetaData()
> engine = create_engine('sqlite:///:memory:', echo=True)
>
> parent_table = Table('parent', metadata,
> Column('id', Integer, primary_key=True))
> child_table = Table('child', metadata,
> Column('id', Integer, primary_key=True),
> Column('parent_id', Integer, ForeignKey('parent.id')))
>
> class Parent(object): pass
> class Child(object): pass
>
> mapper(Parent, parent_table, properties={'children': relation(Child,
> backref=u'parent')})
> mapper(Child, child_table)
> metadata.create_all(engine)
> session = sessionmaker(bind=engine)()
> parentobj = Parent()
>
>
> Running this code fails with this error:
>
> .../SQLAlchemy-0.5.2-py2.6.egg/sqlalchemy/orm/properties.pyc in
> _post_init(self)
> 993
> 994 if self.backref is not None:
> --> 995 self.backref.compile(self)
> 996 elif not mapper.class_mapper(self.parent.class_,
> compile=False)._get_property(self.key, raiseerr=False):
> 997 raise sa_exc.ArgumentError("Attempting to assign a
> new relation '%s' to "
> AttributeError: 'unicode' object has no attribute 'compile'
>
> This line is the problem:
> mapper(Parent, parent_table, properties={'children': relation
> (Child, backref=u'parent')})
> or, to be precise, `backref=u'parent'`. With just `backref='parent'`,
> everything works just fine, it breaks down when using a unicode
> literal for backref name. Is this a bug, or somehow expected behavior?
>
> Thanks everyone...
> >
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