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How to add an extra field in a sub document in MongoDB?
You can use update(). Let us first create a collection with documents −
> db.addExtraFieldDemo.insertOne(
{
"_id": 1,
"UserName": "Larry" ,
"UserOtherDetails":[
{
"UserCountryName": "US",
"UserAge":23
},
{
"UserCountryName": "UK",
"UserAge":24
}
]
}
);
{ "acknowledged" : true, "insertedId" : 1 }Following is the query to display all documents from a collection with the help of find() method −
> db.addExtraFieldDemo.find().pretty();
This will produce the following output −
{
"_id" : 1,
"UserName" : "Larry",
"UserOtherDetails" : [
{
"UserCountryName" : "US",
"UserAge" : 23
},
{
"UserCountryName" : "UK",
"UserAge" : 24
}
]
}Following is the query to add an extra field in a sub document in MongoDB −
> db.addExtraFieldDemo.update({ "_id":1},{ "$set":{ "UserOtherDetails.0.isMarried_" : true }});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the documents once again −
> db.addExtraFieldDemo.find().pretty();
This will produce the following output −
{
"_id" : 1,
"UserName" : "Larry",
"UserOtherDetails" : [
{
"UserCountryName" : "US",
"UserAge" : 23,
"isMarried_" : true
},
{
"UserCountryName" : "UK",
"UserAge" : 24
}
]
}
Updated on: 30-Jul-2019
411 Views
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