How to specify readConcern in Motor 0.6.2 / PyMongo 2.8 ?

[Andrew]

Hello!

I'm using MongoDB 3.2 and current stable version of Motor.

Can "readConcern" option be specified as a keyword argument in motor.motor_tornado.MotorCollection methods?

How to make sure that readConcern option is applied on MongoDB side? I have not found any mention of readConcern in MongoDB log.

Thanks.

[A. Jesse Jiryu Davis]

Motor wraps PyMongo 2.8, which does not have built in support for read concern. If you tell me which operations specifically you need to apply read concern to--find, count, aggregate, or whatever--I can show you how to pass read concern manually.

[Andrew]

I basically just need to specify readConcern for "find_one" and "find" operations.

Correct me if I'm wrong, but I think that MotorDatabase.command is suitable in this case, so instead of "db.collection.find()" I could use:

doc = await db.command(
    'find',

    'collection',
    filter={'_id': _id},
    readConcern={'level': 'majority'},
    singleBatch=True)

[A. Jesse Jiryu Davis]

Yes exactly! Let me know if you need anything more from me.

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