I just upgraded to 0.4.2, and tried to take advantage of the fix
available, but I'm confused. I have this code:
mapper(Resource, resources,
polymorphic_on=resources.c.type,
polymorphic_identity="empty",
column_prefix='_',
properties={
'id': resources.c.id,
'url': synonym('_url', map_column=True),
'children': relation(Resource, backref=backref("_parent",
remote_side=[resources.c.id])),
'parent': synonym('_parent', map_column=True),
'name': synonym('_name', map_column=True),
'type': resources.c.type,
# NOTE: Remember to add here other columns that don't need
# a custom property accessor, like the id. Otherwise, they
# be available as _column_name, not column_name.
},
save_on_init=False,
)
Each of (url, parent, name) is a property in my class, as such:
class Resource(object):
def _get_url(self):
"""My docstring"""
return self._url
def _set_url(self, url):
self._url = url
url = property(_get_url, _set_url)
Of course, the logic in the property code is much more complex than
that.
But when I try to import that module, it says this:
[...]
File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.4.2-py2.5.egg/
sqlalchemy/orm/mapper.py", line 685, in _compile_property
raise exceptions.ArgumentError("Can't compile synonym '%s': no column
on table '%s' named '%s'" % (prop.name,
self.select_table.description, key))
sqlalchemy.exceptions.ArgumentError: Can't compile synonym '_parent':
no column on table 'resources' named 'parent'
It seems that the problem is _only_ with 'parent'.
Any ideas? And by the way, what does map_column do?
Thanks.
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