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I have collection of Users with unique property UserName. I need to insert in this collection array of Users. But if UserNames are equal I need to replace old document with the new one. (for each user) Can be done this by one operation?

Ravi Shankar Bharti
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Astemir Almov
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  • Possible duplicate of [MongoDB update many if exist and create if not. Node API](http://stackoverflow.com/questions/43218310/mongodb-update-many-if-exist-and-create-if-not-node-api) – Mikey Apr 18 '17 at 14:23
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    Yeah they are doing the same thing but NOT with one operation. They essentially used a loop of queries – itsundefined Apr 18 '17 at 14:24
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    Possible duplicate of [Bulk upsert in MongoDB using mongoose](http://stackoverflow.com/questions/25285232/bulk-upsert-in-mongodb-using-mongoose) – ponury-kostek Apr 18 '17 at 14:41

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