迭代通过PyMongo Cursor作为键值对

Question

是否可以将pymongo Cursor作为键值对迭代，如dict？我正在使用python 2.6和pymongo 1.9。

我试过这个：

import pymongo
mongo = pymongo.Connection('localhost')
mongo_db = mongo['my_database']
mongo_coll = mongo_db['my_collection']
cursor = mongo_coll.find()
records = dict([(record_id, record) for record_id, record in mongo_cursor])

但我收到错误：

ValueError: too many values to unpack

Answer 1

尝试：

records = dict((record['_id'], record) for record in cursor)

Answer 2

这是python中的一个函数，我用它来构建一个来自MongoDB游标的JSON响应

def build_contacts_cursor(cursor):
    ''' Builds a JSON response for a given cursor
    '''
    response = json.loads('{}')
    response_to_append_to = response['results'] = []

    for idx, bp in enumerate(cursor):
        response_to_append_to.append(bp)

    return response