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Update an array element matching a condition using $push in MongoDB
For this, use update command and $push. Let us first create a collection with documents −
>db.demo9.insertOne({"StudentDetails":[{"StudentName":"Chris","ListOfSubject":["MySQL","Java"]}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e0f6438d7df943a7cec4f94")
}Following is the query to display all documents from a collection with the help of find() method −
> db.demo9.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e0f6438d7df943a7cec4f94"),
"StudentDetails" : [
{
"StudentName" : "Chris",
"ListOfSubject" : [
"MySQL",
"Java"
]
}
]
}Following is the query to update an array element matching a condition using $push −
> db.demo9.update( { "StudentDetails.StudentName":"Chris"}, {$push:{"StudentDetails.$.ListOfSubject":"MongoDB"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Following is the query to display all documents from a collection with the help of find() method −
> db.demo9.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e0f6438d7df943a7cec4f94"),
"StudentDetails" : [
{
"StudentName" : "Chris",
"ListOfSubject" : [
"MySQL",
"Java",
"MongoDB"
]
}
]
}
Updated on: 01-Apr-2020
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