To change the field name, use the $project. Let us create a collection with documents −
> db.demo517.insertOne({"Name":"Chris Brown"});{ "acknowledged" : true, "insertedId" : ObjectId("5e88a2a2987b6e0e9d18f595") } > db.demo517.insertOne({"Name":"David Miller"});{ "acknowledged" : true, "insertedId" : ObjectId("5e88a2ab987b6e0e9d18f596") } > db.demo517.insertOne({"Name":"John Doe"});{ "acknowledged" : true, "insertedId" : ObjectId("5e88a2b1987b6e0e9d18f597") }
Display all documents from a collection with the help of find() method −
> db.demo517.find();
This will produce the following output −
{ "_id" : ObjectId("5e88a2a2987b6e0e9d18f595"), "Name" : "Chris Brown" } { "_id" : ObjectId("5e88a2ab987b6e0e9d18f596"), "Name" : "David Miller" } { "_id" : ObjectId("5e88a2b1987b6e0e9d18f597"), "Name" : "John Doe" }
Following is the query to change the field name −
> db.demo517.aggregate([{$project:{FullName:"$Name"}}]);
This will produce the following output −
{ "_id" : ObjectId("5e88a2a2987b6e0e9d18f595"), "FullName" : "Chris Brown" } { "_id" : ObjectId("5e88a2ab987b6e0e9d18f596"), "FullName" : "David Miller" } { "_id" : ObjectId("5e88a2b1987b6e0e9d18f597"), "FullName" : "John Doe" }