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Query deeply nested Objects in MongoDB
To query deeply nested objects, use dot(.) notation in MongoDB. Let us create a collection with documents −
> db.demo350.insertOne(
... {
... id:101,
... Name: "Chris",
... details: [
... {
... _id: 1,
... ClientNumber: "10001",
... ClientDetails: [
.
... {
... Name:"David",
... Age:29
... },
... {
... Name:"Bob",
... Age:31
... }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e553a68f8647eb59e5620b8")
}
> db.demo350.insertOne(
... {
... id:102,
... Name: "David",
... details: [
... {
... _id: 2,
... ClientNumber: "10002",
... ClientDetails: [
... {
... Name:"Carol",
... Age:42
... },
... {
... Name:"John",
... Age:37
... }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e553a8ff8647eb59e5620b9")
}Display all documents from a collection with the help of find() method −
> db.demo350.find();
This will produce the following output −
{ "_id" : ObjectId("5e553a68f8647eb59e5620b8"), "id" : 101, "Name" : "Chris", "details" : [ { "_id" : 1, "ClientNumber" : "10001", "ClientDetails" : [ { "Name" : "David", "Age" : 29 }, { "Name" : "Bob", "Age" : 31 } ] } ] }
{ "_id" : ObjectId("5e553a8ff8647eb59e5620b9"), "id" : 102, "Name" : "David", "details" : [ { "_id" : 2, "ClientNumber" : "10002", "ClientDetails" : [ { "Name" : "Carol", "Age" : 42 }, { "Name" : "John", "Age" : 37 } ] } ] }Following is how to query deeply nested objects −
> db.demo350.find({"details.ClientDetails.Name":"John"});This will produce the following output −
{ "_id" : ObjectId("5e553a8ff8647eb59e5620b9"), "id" : 102, "Name" : "David", "details" : [ { "_id" : 2, "ClientNumber" : "10002", "ClientDetails" : [ { "Name" : "Carol", "Age" : 42 }, { "Name" : "John", "Age" : 37 } ] } ] }
Updated on: 02-Apr-2020
1K+ Views
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