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Using positional operator with hierarchies in MongoDB?
Let us create a collection with documents −
> db.demo324.insertOne({"ListOfValues":[10,20,30]}); { "acknowledged" : true, "insertedId" : ObjectId("5e516349f8647eb59e562073") }
Display all documents from a collection with the help of find() method −
> db.demo324.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e516349f8647eb59e562073"), "ListOfValues" : [ 10, 20, 30 ] }
Here is the query displaying how to use positional operator −
> db.demo324.update({"ListOfValues":[10,20,30]},{ $set: { "ListOfValues.$[]": "MongoDB" } }, { upsert: true } ); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo324.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e516349f8647eb59e562073"), "ListOfValues" : [ "MongoDB", "MongoDB", "MongoDB" ] }
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