Michael Bayer wrote:
> use backref=backref(somename, lazy=False, <otherargs>).
I tried changing backrefs to "backref=backref('middle', lazy=False)" in
the above test script, but
hit another issue then:
Traceback (most recent call last):
File "C:\svn\devel\utils\eagerload.py", line 66, in ?
test(False) # will work fine
File "C:\svn\devel\utils\eagerload.py", line 57, in test
obj = session.query(Left).get_by(tag='tag1')
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\query.py", line 95, in
get_by
x = self.select_whereclause(self.join_by(*args, **params), limit=1)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\query.py", line 256, in
select_whereclause
return self._select_statement(statement, params=params)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\query.py", line 372, in
_select_statement
return self.execute(statement, params=params, **kwargs)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\query.py", line 304, in
execute
return self.instances(result, **kwargs)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\query.py", line 323, in
instances
self.mapper._instance(context, row, result)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1177, in
_instance
self.populate_instance(context, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1212, in
populate_instance
prop.execute(selectcontext, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\interfaces.py", line 77,
in execute
self._get_context_strategy(selectcontext).process_row(selectcontext,
instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\strategies.py", line 489,
in process_row
instance.__dict__[self.key] = self.mapper._instance(selectcontext,
decorated_row, None)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1177, in
_instance
self.populate_instance(context, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1212, in
populate_instance
prop.execute(selectcontext, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\interfaces.py", line 77,
in execute
self._get_context_strategy(selectcontext).process_row(selectcontext,
instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\strategies.py", line 511,
in process_row
self.mapper._instance(selectcontext, decorated_row, result_list)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1177, in
_instance
self.populate_instance(context, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1212, in
populate_instance
prop.execute(selectcontext, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\interfaces.py", line 77,
in execute
self._get_context_strategy(selectcontext).process_row(selectcontext,
instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\strategies.py", line 489,
in process_row
instance.__dict__[self.key] = self.mapper._instance(selectcontext,
decorated_row, None)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1177, in
_instance
self.populate_instance(context, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\mapper.py", line 1212, in
populate_instance
prop.execute(selectcontext, instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\interfaces.py", line 77,
in execute
self._get_context_strategy(selectcontext).process_row(selectcontext,
instance, row, identitykey, isnew)
File "c:\svn\sqlalchemy\lib\sqlalchemy\orm\strategies.py", line 505,
in process_row
result_list = selectcontext.attributes[(instance, self.key)]
KeyError: (<__main__.Middle object at 0x00D7A910>, 'left')
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