PyMongo 3.7.0 Released

[shane....@10gen.com]

Version 3.7.0 of the MongoDB Python driver has been released. Highlights include support for MongoDB 4.0 - including transactions, change stream enhancements, wire protocol compression, SCRAM-SHA-256 authentication and a whole lot more.

To see the full list of resolved issues in this release, check out our release notes in Jira: https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10004&version=19287 

Downloads - https://pypi.python.org/pypi/pymongo/3.7.0

Docs - https://api.mongodb.org/python/3.7.0/
Changelog - https://api.mongodb.org/python/3.7.0/changelog.html

Thank you to everyone who contributed to this release!

- The PyMongo dev team

[yar...@sureapp.com]

Bug report:
(I dislike jira)

Python Version: 3.5.2

pymongo 3.7.0

Traceback:  

File "/usr/local/lib/python3.5/dist-packages/pymongo/database.py" in authenticate
  1274.             connect=True)

File "/usr/local/lib/python3.5/dist-packages/pymongo/mongo_client.py" in _cache_credentials
  604.             raise OperationFailure('Another user is already authenticated '

Exception Type: OperationFailure
Exception Value: Another user is already authenticated to this database. You must logout first.

This does not happen on pymongo 3.6.1

[shane....@10gen.com]

Hi Yarden, 

The exception that you're seeing is raised by PyMongo when you attempt to authenticate two users against the same database. For example:

>>> import pymongo

>>> c = pymongo.MongoClient()

>>> c.admin.add_user('admin', 'pass')

>>> c.admin.authenticate('admin', 'pass')

True

>>> c.admin.add_user('other_admin', 'pass')

>>> c.admin.authenticate('other_admin', 'pass')

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "pymongo/database.py", line 1274, in authenticate

    connect=True)

  File "pymongo/mongo_client.py", line 604, in _cache_credentials

    raise OperationFailure('Another user is already authenticated '

pymongo.errors.OperationFailure: Another user is already authenticated to this database. You must logout first.

So there's not enough information for me to diagnose why you're seeing this error only on 3.7.0 and not 3.6.1. Could you please provide your MongoDB version, how you are calling Database.authenticate (please redact usernames/passwords but please include the mechanism you're using), and what databases you are authenticating to?

Thank you,
Shane

[Edward Atkins]

Hi,

I just thought I would raise that I was also experiencing this issue, using the 'mongoengine' library. I was only able to resolve the issue, by forcing mongoengine to use pymongo 3.6.1 under the hood.

I have only one database user, and I was connecting like so:

from mongoengine import connect
connect(mongodb://<dbuser>:<dbpassword>@xxxxxx-xx.xxxx.xxx.mlab.com:35597,xxxxxx-xx.xxxxx.xxxxx.mlab.com:35597/<dbname>?replicaSet=xx-xxxxx7&ssl=true)

MongoDB version 3.6.5 FYI

[Nguyen Thanh]

You saved my day!

Thanks!

[a...@princeton.edu]

I had this issue too. I was connecting to an MLAB instance on Heroku using MONGODB_URI

https://stackoverflow.com/questions/51220364/mongoengine-another-user-is-already-authenticated-to-this-database-you-must-l/51226629#51226629

[shane....@10gen.com]

Thank you all! We're working on a fix for this issue. Feel free to follow along here: https://jira.mongodb.org/browse/PYTHON-1609.

[Bernie Hackett]

A fix has been committed to the master branch for this issue. Please try it and let us know if it resolves your issue. We'll do a 3.7.1 release with this fix backported.