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Cannot push into an array from MongoDB?
To push into an array with MongoDB, use $push. Let us create a collection with documents −
> db.demo445.insertOne({"ListOfFriends":["Robert","Mike","Sam","Carol","David","Mike"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e78f099bbc41e36cc3caec2")
}Display all documents from a collection with the help of find() method −
> db.demo445.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e78f099bbc41e36cc3caec2"),
"ListOfFriends" : [
"Robert",
"Mike",
"Sam",
"Carol",
"David",
"Mike"
]
}Following is the query to push into an array −
> db.demo445.update(
... { _id: ObjectId("5e78f099bbc41e36cc3caec2") },
... { $push: { ListOfFriends: "Chris Brown" } }
... )
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo445.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e78f099bbc41e36cc3caec2"),
"ListOfFriends" : [
"Robert",
"Mike",
"Sam",
"Carol",
"David",
"Mike",
"Chris Brown"
]
}
Updated on: 06-Apr-2020
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