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Push and slice multiple times in MongoDB?
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" ] }
Updated on: 13-May-2020
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