各位，
我只是花了很多时间试图查找这个 - 我应该错过一些基本的东西。
我有一个 python 对象，我想做的就是将这个对象插入到 mondodb 中。
这就是我所拥有的：
from pymongo import Connection
import json
conn = Connection()
db = conn.cl_database
postings = db.postings_collection
class Posting(object):
def __init__(self, link, found=None, expired=None):
self.link = link
self.found = found
self.expired = expired
posting = Posting('objectlink1')
value = json.dumps(posting, default=lambda x:x.__dict__)
postings.insert(value)
抛出这个错误：
Traceback (most recent call last):
File "./mongotry.py", line 21, in <module>
postings.insert(value)
File "build/bdist.macosx-10.7-intel/egg/pymongo/collection.py", line 302, in insert
File "build/bdist.macosx-10.7-intel/egg/pymongo/database.py", line 252, in _fix_incoming
File "build/bdist.macosx-10.7-intel/egg/pymongo/son_manipulator.py", line 73, in transform_incoming
TypeError: 'str' object does not support item assignment
似乎是因为 json.dumps() 返回一个字符串。
现在，如果我在插入之前加载该值，它就可以正常工作：
posting = Posting('objectlink1')
value = json.dumps(posting, default=lambda x:x.__dict__)
value = json.loads(value)
postings.insert(value)
最直接的做法是什么？
Thanks!
