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Combine update and query parts to form the upserted document in MongoDB?
You need to use $set operator along with upsert:true. Let us first create a collection with documents −
> db.updateWithUpsertDemo.insertOne({"StudentFirstName":"John","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a61c345990cee87fd890") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"Larry","StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a624345990cee87fd891") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"David","StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a62c345990cee87fd892") }
Following is the query to display all documents from a collection with the help of find() method −
> db.updateWithUpsertDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Larry", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }
Following is the query to combine update and query parts to form the upserted document −
> db.updateWithUpsertDemo.update({_id: ObjectId("5cd2a624345990cee87fd891")},{"$set": {"StudentFirstName": "Chris"}}, {upsert:true}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Let us check whether the field “StudentFirstName” has been changed or not −
> db.updateWithUpsertDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Chris", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }
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