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How do I add a field to existing record in MongoDB?
You can use update command to add a field to existing record. Let us first create a collection with documents −
> db.addAFieldToEveryRecordDemo.insertOne({"ClientName":"Chris","ClientAge":34}); { "acknowledged" : true, "insertedId" : ObjectId("5cd00e32588d4a6447b2e061") } > db.addAFieldToEveryRecordDemo.insertOne({"ClientName":"Robert","ClientAge":36}); { "acknowledged" : true, "insertedId" : ObjectId("5cd00e59588d4a6447b2e062") }
Following is the query to display all documents from a collection with the help of find() method −
> db.addAFieldToEveryRecordDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd00e32588d4a6447b2e061"), "ClientName" : "Chris", "ClientAge" : 34 } { "_id" : ObjectId("5cd00e59588d4a6447b2e062"), "ClientName" : "Robert", "ClientAge" : 36 }
Here is the query to add a field to every record. We are adding ClientDetails −
>db.addAFieldToEveryRecordDemo.update({},{$set:{"ClientDetails.ClientCountryName":""}},true,true); WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })
Let us check all documents have been added with new record or not −
> db.addAFieldToEveryRecordDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd00e32588d4a6447b2e061"), "ClientName" : "Chris", "ClientAge" : 34, "ClientDetails" : { "ClientCountryName" : "" } } { "_id" : ObjectId("5cd00e59588d4a6447b2e062"), "ClientName" : "Robert", "ClientAge" : 36, "ClientDetails" : { "ClientCountryName" : "" } }
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