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Make nested queries in MongoDB 4 to fetch a specific document
For nested queries, let us first create a collection with documents −
> db.demo492.insertOne({
... "ProductDetails" :
... {
... "StockDetails" : [
... { "ProductName" : "Product-1" },
... {"ProductName" : "Product-2"},
... { "ProductName" : "Product-3"}
...
... ]
...
... }
... });
{
"acknowledged" : true,
"insertedId" : ObjectId("5e849db8b0f3fa88e22790c2")
}
>
>
>
> db.demo492.insertOne({
... "ProductDetails" :
... {
... "StockDetails" : [
... { "ProductName" : "Product-4" },
... {"ProductName" : "Product-5"},
... { "ProductName" : "Product-6"}
...
... ]
...
... }
... });
{
"acknowledged" : true,
"insertedId" : ObjectId("5e849dceb0f3fa88e22790c3")
}Display all documents from a collection with the help of find() method −
> db.demo492.find();
This will produce the following output −
{ "_id" : ObjectId("5e849db8b0f3fa88e22790c2"), "ProductDetails" : { "StockDetails" : [ {
"ProductName" : "Product-1" }, { "ProductName" : "Product-2" }, { "ProductName" : "Product3" } ] } }
{ "_id" : ObjectId("5e849dceb0f3fa88e22790c3"), "ProductDetails" : { "StockDetails" : [ {
"ProductName" : "Product-4" }, { "ProductName" : "Product-5" }, { "ProductName" : "Product6" } ] } }Following displays nested queries in MongoDB using dot notation to fetch a specific document −
> db.demo492.find({ "ProductDetails.StockDetails.ProductName":"Product-1"});This will produce the following output −
{ "_id" : ObjectId("5e849db8b0f3fa88e22790c2"), "ProductDetails" : { "StockDetails" : [ {
"ProductName" : "Product-1" }, { "ProductName" : "Product-2" }, { "ProductName" : "Product3" } ] } }
Updated on: 13-May-2020
311 Views
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