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How to push new items to an array inside of an object in MongoDB?
You can use $elemMatch operator for this. Let us first create a collection with documents −
> db.pushNewItemsDemo.insertOne(
{
"_id" :1,
"StudentScore" : 56,
"StudentOtherDetails" : [
{
"StudentName" : "John",
"StudentFriendName" : [
"Bob",
"Carol"
]
},
{
"StudentName" : "David",
"StudentFriendName" : [
"Mike",
"Sam"
]
}
]
}
);
{ "acknowledged" : true, "insertedId" : 1 }Following is the query to display all documents from a collection with the help of find() method −
> db.pushNewItemsDemo.find();
This will produce the following output −
{ "_id" : 1, "StudentScore" : 56, "StudentOtherDetails" : [ { "StudentName" : "John", "StudentFriendName" : [ "Bob", "Carol" ] }, { "StudentName" : "David", "StudentFriendName" : [ "Mike", "Sam" ] } ] }Following is the query to push new items to an array inside of an object −
>db.pushNewItemsDemo.update({"_id":1,"StudentOtherDetails":{"$elemMatch":{"StudentName":"David"}}},
{"$push":{"StudentOtherDetails.$.StudentFriendName":"James"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the documents once again −
> db.pushNewItemsDemo.find();
This will produce the following output −
{ "_id" : 1, "StudentScore" : 56, "StudentOtherDetails" : [ { "StudentName" : "John", "StudentFriendName" : [ "Bob", "Carol" ] }, { "StudentName" : "David", "StudentFriendName" : [ "Mike", "Sam", "James" ] } ] }
Updated on: 30-Jul-2019
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