MongoDB query to remove element from array as sub property

To remove, use $pull in MongoDB. Let us first create a collection with documents −

> db.demo388.insertOne( ...    { ...       _id: '101', ...       userDetails: { ...          isMarried: false, ...          userInfo: [ ...             { ...                Name:"Chris", ...                Age:21 ... ...             } ...          ] ...       } ...    } ... ); { "acknowledged" : true, "insertedId" : "101" }

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

> db.demo388.find();

This will produce the following output −

{ "_id" : "101", "userDetails" : { "isMarried" : false, "userInfo" : [ { "Name" : "Chris", "Age" : 21 } ] } }

Following is the query to remove element from array as sub property −

> db.demo388.update( ...    { "_id": "101" }, ...    { "$pull": { "userDetails.userInfo": { "Name":"Chris" } } ... }) WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

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

> db.demo388.find();

This will produce the following output −

{ "_id" : "101", "userDetails" : { "isMarried" : false, "userInfo" : [ ] } }