How to stop insertion of Duplicate documents in a mongodb collection

Question

Let us have a MongoDB collection which has three docs..

db.collection.find()

 { _id:\'...\', user: \'A\', title: \'Physics\',   Bank: \'         


        

Answer 1

Maybe this is a bit slower than other ways but it works too. It can be used inside a loop:

db.collection.replaceOne(query, data, {upsert: true})

The query may be something like:

{ _id: '5f915390950f276680720b57' }

https://docs.mongodb.com/manual/reference/method/db.collection.replaceOne