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

Don't use insert.

Use update with upsert=true. Update will look for the document that matches your query, then it will modify the fields you want and then, you can tell it upsert:True if you want to insert if no document matches your query.

db.collection.update(
   ,
   ,
  {
    upsert: ,
     multi: ,
    writeConcern: 
   }
  )

So, for your example, you could use something like this:

db.collection.update(doc, doc, {upsert:true})