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Combine update and query parts to form the upserted document in MongoDB?
<p>You need to use $set operator along with upsert:true. Let us first create a collection with documents −</p><pre class="prettyprint notranslate">> db.updateWithUpsertDemo.insertOne({"StudentFirstName":"John","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a61c345990cee87fd890") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"Larry","StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a624345990cee87fd891") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"David","StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a62c345990cee87fd892") }</pre><p>Following is the query to display all documents from a collection with the help of find() method −</p><pre class="prettyprint notranslate">> db.updateWithUpsertDemo.find().pretty();</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Larry", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }</pre><p>Following is the query to combine update and query parts to form the upserted document −</p><pre class="prettyprint notranslate">> db.updateWithUpsertDemo.update({_id: ObjectId("5cd2a624345990cee87fd891")},{"$set": {"StudentFirstName": "Chris"}}, {upsert:true}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })</pre><p>Let us check whether the field “StudentFirstName” has been changed or not −</p><pre class="prettyprint notranslate">> db.updateWithUpsertDemo.find().pretty();</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Chris", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }</pre>
Updated on 30-Jul-2019 22:30:26
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