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How can I update child objects in MongoDB?
To update child objects, use $set operator. Let us first create a collection with document −
>db.updateChildObjectsDemo.insertOne({"StudentName":"Chris","StudentOtherDetails":{"StudentSubject":"MongoDB","StudentCountryName":"AUS"}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ce964e078f00858fb12e91f")
}Following is the query to display all documents from a collection with the help of find() method −
> db.updateChildObjectsDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5ce964e078f00858fb12e91f"),
"StudentName" : "Chris",
"StudentOtherDetails" : {
"StudentSubject" : "MongoDB",
"StudentCountryName" : "AUS"
}
}Following is the query to update child objects in MongoDB −
> db.updateChildObjectsDemo.update({"StudentName" : "Chris"},{$set:{"StudentOtherDetails.StudentCountryName":"UK"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the document once again −
> db.updateChildObjectsDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5ce964e078f00858fb12e91f"),
"StudentName" : "Chris",
"StudentOtherDetails" : {
"StudentSubject" : "MongoDB",
"StudentCountryName" : "UK"
}
}
Updated on: 30-Jul-2019
694 Views
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