{a: 1, b: 1, ratio: null}
how to I can update atomically ratio field, if ratio = a / b ?
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Hett
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@chridam tell me please, where is answer? Сan you copy the line of code here or remove duplicate flag? – Hett Jan 15 '19 at 09:27
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1See the answer - https://stackoverflow.com/a/14423151/1388513 – Ravi Kumar Gupta Jan 15 '19 at 09:31
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1`db.collection.aggregate( [ { "$addFields": { "ratio": { "$divide": [ "$a", "$b" ] } }}, { "$out": "collection" } ] )` Add checks for the `b` field to be non-zero or not null. – chridam Jan 15 '19 at 10:49
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@chridam thanks, but is it atomically? – Hett Jan 18 '19 at 06:21