How to get field of Mongodb document?

Question

Python

There are many documents of the same type with the "number" field in the meringue on the server. The task is to get the sum of all "number". Tried to do like this:

nums = db.events.find({"eventName" : "Number Hard"})
num = 0
for numbers in nums:
    num = num + int((numbers, {"number": 1, "_id": 0}))

but it doesn't work. Can you suggest how to do it? It is advisable not to use Mongo commands in a loop because it takes a lot of time.

Answer 1

aggregate framework:
stackoverflow.com/questions/18969916/mongodb-sum-query
https://docs.mongodb.com/manual/reference/operator...

Answer 2

use map/reduce https://docs.mongodb.com/manual/core/map-reduce/