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How to pop a single value in MongoDB?
You can use pop() for this. Let us first create a collection with documents −
> db.persistChangeDemo.insertOne({"Name" : "Larry", "CreditScore": [500,700,760,100]}); { "acknowledged" : true, "insertedId" : ObjectId("5cdfc52cbf3115999ed51203") }
Following is the query to display all documents from a collection with the help of find() method −
> db.persistChangeDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cdfc52cbf3115999ed51203"), "Name" : "Larry", "CreditScore" : [ 500, 700, 760, 100 ] }
Following is the query to pop a value −
> myDocument.CreditScore.pop(); 100
Let us save the above document −
> db.persistChangeDemo.save(myDocument); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Let us check the document once again −
> db.persistChangeDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cdfc52cbf3115999ed51203"), "Name" : "Larry", "CreditScore" : [ 500, 700, 760 ] }
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