You can use aggregate framework to create an alias. Let us first create a collection with documents −
> db.creatingAliasDemo.insertOne({_id:101,"Name":"John Doe"});
{ "acknowledged" : true, "insertedId" : 101 }
> db.creatingAliasDemo.insertOne({_id:102,"Name":"David Miller"});
{ "acknowledged" : true, "insertedId" : 102 }
> db.creatingAliasDemo.insertOne({_id:103,"Name":"Sam Williams"});
{ "acknowledged" : true, "insertedId" : 103 }Following is the query to display all documents from the collection with the help of find() method −
> db.creatingAliasDemo.find().pretty();
This will produce the following output −
{ "_id" : 101, "Name" : "John Doe" }
{ "_id" : 102, "Name" : "David Miller" }
{ "_id" : 103, "Name" : "Sam Williams" }Following is the query to create alias in a query −
> db.creatingAliasDemo.aggregate(
... [
... {
... $project: {
... _id:1,
... "FullName":"$Name"
... }
... }
... ]
... );This will produce the following output −
{ "_id" : 101, "FullName" : "John Doe" }
{ "_id" : 102, "FullName" : "David Miller" }
{ "_id" : 103, "FullName" : "Sam Williams" }
