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How to delete document from a collection in MongoDB using deleteOne() method?
To delete document from a collection in MongoDB, you can use the deleteOne() method. Let us first create a collection and insert some documents to it:
> db.deleteDocumentsDemo.insert({"Name":"Larry","Age":23}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Mike","Age":21}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Sam","Age":24}); WriteResult({ "nInserted" : 1 })
Now display all the documents from the collection. The query is as follows:
> db.deleteDocumentsDemo.find().pretty();
The following is the output:
{ "_id" : ObjectId("5c6ab0e064f3d70fcc914805"), "Name" : "Larry", "Age" : 23 } { "_id" : ObjectId("5c6ab0ef64f3d70fcc914806"), "Name" : "Mike", "Age" : 21 } { "_id" : ObjectId("5c6ab0f864f3d70fcc914807"), "Name" : "Sam", "Age" : 24 }
Now use the deleteOne() command. The name suggests that it will delete only one document from collection. The query is as follows:
> db.deleteDocumentsDemo.deleteOne({"Name":"Larry"});
The following is the output:
{ "acknowledged" : true, "deletedCount" : 1 }
Now display the documents from the collection with the help of find() command. The query is as follows:
> db.deleteDocumentsDemo.find().pretty();
The following is the output:
{ "_id" : ObjectId("5c6ab0ef64f3d70fcc914806"), "Name" : "Mike", "Age" : 21 } { "_id" : ObjectId("5c6ab0f864f3d70fcc914807"), "Name" : "Sam", "Age" : 24 }
Look at the above sample output, there is no document with the field Name: “Larry”.
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