【发布时间】：2015-06-19 17:16:36
【问题描述】：
我正在使用 Flask 构建一个网站，其中我使用 MongoDB 和 MongoEngine ORM。为了重新开始，我现在升级了我的 ubuntu 14.04 开发机器上的所有 apt 和 pip 包。不幸的是，这中断了我与 MongoDB 的联系：
Traceback (most recent call last):
File "./run.py", line 4, in <module>
from app import app, socketio
File "/home/kr65/beta/app/__init__.py", line 21, in <module>
mongoDb = MongoEngine(app)
File "/usr/local/lib/python2.7/dist-packages/flask_mongoengine/__init__.py", line 33, in __init__
self.init_app(app)
File "/usr/local/lib/python2.7/dist-packages/flask_mongoengine/__init__.py", line 66, in init_app
self.connection = mongoengine.connect(**conn_settings)
File "/usr/local/lib/python2.7/dist-packages/mongoengine/connection.py", line 164, in connect
return get_connection(alias)
File "/usr/local/lib/python2.7/dist-packages/mongoengine/connection.py", line 126, in get_connection
raise ConnectionError("Cannot connect to database %s :\n%s" % (alias, e))
mongoengine.connection.ConnectionError: Cannot connect to database default :
False is not a read preference.
我检查了 MongoDB 是否启动：
$ sudo service mongodb status
mongodb start/running, process 781
如果我可以进入交互式命令行：
$ mongo
MongoDB shell version: 2.4.9
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
Server has startup warnings:
Tue Apr 14 09:14:10.267 [initandlisten]
Tue Apr 14 09:14:10.267 [initandlisten] ** WARNING: You are running in OpenVZ. This is known to be broken!!!
Tue Apr 14 09:14:10.267 [initandlisten]
>
我没有对代码或密码或类似的东西进行任何更改。我重新启动并重新启动了 mongoDB，但没有任何效果。我的设置是这样的：
MONGODB_SETTINGS = {
'db': 'mydatabasename'
}
我像这样实例化连接（以前有效）：
app = Flask(__name__)
app.config.from_object('config')
mongoDb = MongoEngine(app)
由于我没有真正改变任何东西，我有点不确定在哪里寻找解决方案。有没有人有任何提示我可以解决这个问题？
[编辑] 有了@lapinkoira 的提示，我的 MongoDB 现在可以正确启动，但现在查询时出现以下错误。任何想法如何解决这个问题？
File "/home/kr65/beta/app/views/webviews.py", line 476, in getDoc
userDoc = UserDocument.objects(id=docId).first()
File "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 309, in first
result = queryset[0]
File "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 160, in __getitem__
return queryset._document._from_son(queryset._cursor[key],
File "/usr/local/lib/python2.7/dist-packages/mongoengine/queryset/base.py", line 1410, in _cursor
**self._cursor_args)
File "/usr/local/lib/python2.7/dist-packages/pymongo/collection.py", line 924, in find
return Cursor(self, *args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'snapshot'
【问题讨论】：
-
你有哪个版本的pymongo，你现在有哪个版本？
标签： python mongodb flask mongoengine flask-mongoengine