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Editorial Team
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Asked: 2026-05-27T04:19:29+00:00

In Mongo shell, after running a mapreduce on collection DEPS with output named STATS:

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In Mongo shell, after running a mapreduce on collection DEPS with output named STATS:

>show collections
DEPS
STATS
system.indexes

So I see both collections, no problem. However:

>db.DEPS.findOne()    <--  returns a DEPS record
>db.STATS.findOne()   <--  returns err msg "db.stats.findOne is not a function"

So to see stats data I need to type:

>db.getCollection("STATS").findOne()

This is not a problem, in so far as I can see all the data I need to see. But as a matter of understanding Mongo, why is it that the first collection (created via mongoimport) comes with a findOne method, and the second (created via mapreduce) does not ?

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1 Answer

  1. Editorial Team

    Interesting. Maybe the collection name conflicts with the db.stats() command (which gives you database statistics). I’d not have expected case insensitity here, though.

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