To push and slice in MongoDB, use $push and $slice. Let us create a collection with documents −
> db.demo656.insertOne({Name:"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5ea060264deddd72997713cf") }
Display all documents from a collection with the help of find() method −
> db.demo656.find();
This will produce the following output −
{ "_id" : ObjectId("5ea060264deddd72997713cf"), "Name" : "John" }
Here is the query to push and slice in MongoDB−
> db.demo656.update({Name:"John"}, {"$push":{"ListOfName": {"$each": ["John"], "$slice": -9}}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo656.find();
This will produce the following output −
{ "_id" : ObjectId("5ea060264deddd72997713cf"), "Name" : "John", "ListOfName" : [ "John" ] }
Following is the query to push and slice once again −
> db.demo656.update({Name:"John"}, {"$push":{"ListOfName": {"$each": ["David"], "$slice": -9}}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo656.find();
This will produce the following output −
{ "_id" : ObjectId("5ea060264deddd72997713cf"), "Name" : "John", "ListOfName" : [ "John", "David" ] }