在mongodb中插入python对象

Question

伙计们,我只是花了很多时间试着看一下 - 我应该遗漏一些基本的东西.

我有一个python对象,我想要做的就是在mondodb中插入这个对象.

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)

抛出此错误:

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,如果我在插入之前做了大量的值,它可以正常工作:

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？

谢谢!

Answer 1

是什么value在你最初的代码？

它应该dict不是类实例

这应该工作:

postings.insert(posting.__dict__)