persons_table = Table(u'persons', dbconfig.metadata,
Column(u'person_id', Integer(20), primary_key=True,
autoincrement=True, nullable=False, default=0),
Column(u'level', Integer(11), nullable=False, default=1),
autoload = False)
class Person(object):
pass
mapper(Person, persons_table)
stat_by_level = select([Person.level,
func.count(Person.level).label('count')],
order_by=[Person.level],
group_by=[Person.level]).alias('stats')
class StatByLevel(object):
pass
mapper(StatByLevel, stat_by_level)
desktop:~/Projects/test$ python model.py
Traceback (most recent call last):
File "model.py", line 58, in <module>
mapper(StatByLevel, stat_by_level)
File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.4.2dev_r3866-
py2.5.egg/sqlalchemy/orm/__init__.py", line 518, in mapper
return Mapper(class_, local_table, *args, **params)
File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.4.2dev_r3866-
py2.5.egg/sqlalchemy/orm/mapper.py", line 153, in __init__
self._compile_pks()
File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.4.2dev_r3866-
py2.5.egg/sqlalchemy/orm/mapper.py", line 421, in _compile_pks
if len(self._pks_by_table[self.mapped_table]) == 0:
KeyError: <sqlalchemy.sql.expression.Alias object at 0x842c98c>
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