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How to add a sub-document to sub-document array in MongoDB?
Use the $push operator to add a sub-document. Let us first create a collection with documents −
> db.subDocumentToSubDocumentDemo.insertOne(
{
"_id" :101,
"StudentName" : "Larry",
"StudentAge" : 21,
"StudentDetails" : [
{
"StudentCountryName" : "US",
"StudentFavouriteSubjectList" : [ ]
}
]
}
);
{ "acknowledged" : true, "insertedId" : 101 }Following is the query to display all documents from a collection with the help of find() method −
> db.subDocumentToSubDocumentDemo.find().pretty();
This will produce the following output −
{
"_id" : 101,
"StudentName" : "Larry",
"StudentAge" : 21,
"StudentDetails" : [
{
"StudentCountryName" : "US",
"StudentFavouriteSubjectList" : [ ]
}
]
}Following is the query to add a sub-document to sub-document array in MongoDB −
> db.subDocumentToSubDocumentDemo.update(
{ "_id": 101 },
{
"$push": {
"StudentDetails": {
"StudentCountryName" : "UK",
"StudentFavouriteSubjectList" : ["MongoDB","Java" ]
}
}
}
);
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check all the documents once again −
> db.subDocumentToSubDocumentDemo.find().pretty();
This will produce the following output −
{
"_id" : 101,
"StudentName" : "Larry",
"StudentAge" : 21,
"StudentDetails" : [
{
"StudentCountryName" : "US",
"StudentFavouriteSubjectList" : [ ]
},
{
"StudentCountryName" : "UK",
"StudentFavouriteSubjectList" : [
"MongoDB",
"Java"
]
}
]
}
Updated on: 30-Jul-2019
1K+ Views
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