Sort MongoDB Collection by Array value?

To sort MongoDB collection by Array value, use aggregate() along with $sort. Let us create a collection with documents −

> db.demo577.insertOne( ...    { ... ...       "student": { ...          "details": [ ...             { ...                Name:"Chris", ...                Score:45 ...             }, ...             { ...                Name:"Bob", ...                Score:33 ...             }, ...             { ...                Name:"David", ...                Score:48 ...             } ...          ] ...       } ...    } ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5e916ff1581e9acd78b427ff") }

Display all documents from a collection with the help of find() method −

> db.demo577.find();

This will produce the following output −

{ "_id" : ObjectId("5e916ff1581e9acd78b427ff"), "student" : { "details" : [    { "Name" : "Chris", "Score" : 45 },    { "Name" : "Bob", "Score" : 33 },    { "Name" : "David", "Score" : 48 } ] } }

Following is the query to sort the collection by array value −

> db.demo577.aggregate([ ...    {$unwind:"$student"}, ...    {$unwind:"$student.details"}, ... ...    {$sort:{"student.details.Score":-1}} ... ]);

This will produce the following output −

{ "_id" : ObjectId("5e916ff1581e9acd78b427ff"), "student" : { "details" : { "Name" : "David", "Score" : 48 } } } { "_id" : ObjectId("5e916ff1581e9acd78b427ff"), "student" : { "details" : { "Name" : "Chris", "Score" : 45 } } } { "_id" : ObjectId("5e916ff1581e9acd78b427ff"), "student" : { "details" : { "Name" : "Bob", "Score" : 33 } } }