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How to re-map the fields of a MongoDB collection?
To re-map the fields of a MongoDB collection, use update() along with $rename. Let us first create a collection with documents −
> db.demo171.insertOne( { "Name": "Chris", "Details": { "SubjectName": "MySQL", "CountryName": "US" } } );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3837 399e4f06af551997e0")
}Display all documents from a collection with the help of find() method −
> db.demo171.find();
This will produce the following output −
{ "_id" : ObjectId("5e3837399e4f06af551997e0"), "Name" : "Chris", "Details" : { "SubjectName" : "MySQL", "CountryName" : "US" } }Following is the query to re-map the fields of a MongoDB collection −
> db.demo171.update({}, { $rename : { 'Name' : 'StudentName'} }, false, true);
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo171.find();
This will produce the following output −
{ "_id" : ObjectId("5e3837399e4f06af551997e0"), "Details" : { "SubjectName" : "MySQL", "CountryName" : "US" }, "StudentName" : "Chris" }
Updated on: 27-Mar-2020
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