How do you update a MongoDB document while replacing the entire document?

Let us first create a collection with a document −

>db.replacingEntireDocumentDemo.insertOne({"StudentFirstName":"John","StudentLastName":"Smith","StudentCountryName":"US"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd3119bb64f4b851c3a13e8") }

Following is the query to display document from a collection with the help of find() method −

> db.replacingEntireDocumentDemo.find().pretty();

This will produce the following output −

{    "_id" : ObjectId("5cd3119bb64f4b851c3a13e8"),    "StudentFirstName" : "John",    "StudentLastName" : "Smith",    "StudentCountryName" : "US" }

Following is the query to update a MongoDB document while replacing the entire document −

>db.replacingEntireDocumentDemo.update({"StudentFirstName":"John","StudentLastName":"Smith","StudentCountryName":"US"}, {"StudentFirstName":"David","StudentLastName":"Miller","StudentCountryName":"AUS"}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

Let us display all the records from the collection once again −

> db.replacingEntireDocumentDemo.find().pretty();

This will produce the following output −

{    "_id" : ObjectId("5cd3119bb64f4b851c3a13e8"),    "StudentFirstName" : "David",    "StudentLastName" : "Miller",    "StudentCountryName" : "AUS" }