How to get the document with max value for a field with map-reduce in pymongo?

Question

How do I find the document with the maximum uid field with map-reduce in pymongo?

I have tried the following but it prints out blanks:

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Answer 1

You can use find_one to find the doc with the maximum uid by sorting on that field descending:

db.things.find_one(sort=[("uid", -1)])

or using the defined constant:

db.things.find_one(sort=[("uid", pymongo.DESCENDING)])