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How to only get the data of the nested JSON object in MongoDB?
To get the data of the nested JSON object in MongoDB, use findOne(). Let us create a collection with documents −
> db.demo109.insertOne(
... {
... "Name" : "Chris",
... "Subjects" : [
... {
... "Id" : "100",
... "Name":"MySQL",
... "InstructorDetails" : [
... {
... "Name" : "John"
... }
... ]
... },
... {
... "Id" : "101",
... "Name":"MongoDB",
... "InstructorDetails" : [
... {
... "Name" : "Mike"
... }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2ee7df9fd5fd66da21447a")
}Display all documents from a collection with the help of find() method −
> db.demo109.find();
This will produce the following output −
{
"_id" : ObjectId("5e2ee7df9fd5fd66da21447a"), "Name" : "Chris", "Subjects" : [
{ "Id" : "100", "Name" : "MySQL", "InstructorDetails" : [ { "Name" : "John" } ] },
{ "Id" : "101", "Name" : "MongoDB", "InstructorDetails" : [ { "Name" : "Mike" } ] }
]
}Following is the query to only get the data of the nested JSON object in MongoDB −
> db.demo109.findOne(
... { Name: "Chris"}
... , { 'Subjects': { $elemMatch:{'Id':"100"} } }
... , function (err, doc) { console.log(doc) });This will produce the following output −
{
"_id" : ObjectId("5e2ee7df9fd5fd66da21447a"),
"Subjects" : [
{
"Id" : "100",
"Name" : "MySQL",
"InstructorDetails" : [
{
"Name" : "John"
}
]
}
]
}
Updated on: 30-Mar-2020
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