Sql Alchemy > TypeError: '实例方法'对象不支持项赋值
我这边有一些代码：
from sqlalchemy import *
from sqlalchemy.orm import *
from web.models.card import *
connectionString = "postgresql://www:www@localhost/prod"
databaseEngine = create_engine(connectionString)
sessionFactory = sessionmaker(autoflush = True, autocommit = False, bind = databaseEngine)
session = sessionFactory()
CardsCollection = session.query(card).all()
_content = {}
for index in range(0, len(CardsCollection)):
c = CardsCollection[index]
_content[index] = c
print json.dumps(_content)
然后我遇到了这个错误：
Traceback (most recent call last):
File "/home/src/py/raspberry/src/dictionaryTest.py", line 15, in
CardsCollection = session.query(card).all()
File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/query.py", line 1453, in all
return list(self)
File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/query.py", line 1676, in instances
rows = [process[0](row, None) for row in fetch]
File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/mapper.py", line 2234, in _instance
populate_state(state, dict_, row, isnew, only_load_props)
File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/mapper.py", line 2113, in populate_state
populator(state, dict_, row)
File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/strategies.py", line 127, in new_execute
dict_[key] = row[col]
TypeError: 'instancemethod' object does not support item assignment
有没有人能帮我一下？我试过几种方法，也查了一些字典是怎么工作的……但就是没搞明白。
[为了奇怪的解决方案而编辑] 原来，在卡片模型上重写 self.__dict__(self) 方法就是导致这个问题的原因。不过，我也不太明白为什么会这样。