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Push new key element into subdocument of MongoDB?
You can use $set operator for this. Following is the syntax −
db.yourCollectionName.update({"_id" : yourObjectId },{$set: { "yourOuterFieldName.anyInnerFieldName": yourValue}});Let us first create a collection with documents −
> db.pushNewKeyDemo.insertOne({"UserId":100,"UserDetails":{}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cda58f5b50a6c6dd317adbf")
}Following is the query to display all documents from a collection with the help of find() method −
> db.pushNewKeyDemo.find();
This will produce the following output −
{ "_id" : ObjectId("5cda58f5b50a6c6dd317adbf"), "UserId" : 100, "UserDetails" : { } }Following is the query to push new key element into subdocument of MongoDB −
> db.pushNewKeyDemo.update({"_id" : ObjectId("5cda58f5b50a6c6dd317adbf")},{$set: {
"UserDetails.UserName": "David Miller"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the document once again −
> db.pushNewKeyDemo.find();
This will produce the following output −
{ "_id" : ObjectId("5cda58f5b50a6c6dd317adbf"), "UserId" : 100, "UserDetails" : { "UserName" : "David Miller" } }
Updated on: 30-Jul-2019
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