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How can I delete an item from an Object in MongoDB?
To delete an item from an object in MongoDB, use $unset. Let us create a collection with documents −
> db.demo467.insertOne(
... {
... _id:101,
... "Information":{"Name":"Chris"}
... }
... );
{ "acknowledged" : true, "insertedId" : 101 }
> db.demo467.insertOne(
... {
... _id:102,
... "Information":{"Name":"David"}
... }
... );
{ "acknowledged" : true, "insertedId" : 102 }Display all documents from a collection with the help of find() method −
> db.demo467.find();
This will produce the following output −
{ "_id" : 101, "Information" : { "Name" : "Chris" } }
{ "_id" : 102, "Information" : { "Name" : "David" } }Following is the query to delete an item from an Object −
> db.demo467.update({_id:102},{$unset: {"Information.Name":1}},{multi: true});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo467.find();
This will produce the following output −
{ "_id" : 101, "Information" : { "Name" : "Chris" } }
{ "_id" : 102, "Information" : { } }
Updated on: 11-May-2020
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