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Using find() to search for nested keys in MongoDB?
For find() to search for nested keys in MongoDB, you can use dot(.) notation. Following is the syntax
db.yourCollectionName.find({"yourOuterFieldName.yourInnerFieldName":"yourValue"}).pretty();Let us first create a collection with documents:
>db.searchForNestedKeysDemo.insertOne({"ClientName":"Larry","ClientAge":28,"ClientExtra
Details":{"isEducated":true,"CountryName":"US"}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca20e8b66324ffac2a7dc64")
}
>db.searchForNestedKeysDemo.insertOne({"ClientName":"Chris","ClientAge":29,"ClientExtra
Details":{"isEducated":false,"CountryName":"UK"}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca20ea366324ffac2a7dc65")
}
>db.searchForNestedKeysDemo.insertOne({"ClientName":"David","ClientAge":39,"ClientExtra
Details":{"isEducated":true,"CountryName":"AUS"}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca20eba66324ffac2a7dc66")
}Following is the query to display all documents from a collection with the help of find() method
> db.searchForNestedKeysDemo.find().pretty();
This will produce the following output
{
"_id" : ObjectId("5ca20e8b66324ffac2a7dc64"),
"ClientName" : "Larry",
"ClientAge" : 28,
"ClientExtraDetails" : {
"isEducated" : true,
"CountryName" : "US"
}
}
{
"_id" : ObjectId("5ca20ea366324ffac2a7dc65"),
"ClientName" : "Chris",
"ClientAge" : 29,
"ClientExtraDetails" : {
"isEducated" : false,
"CountryName" : "UK"
}
}
{
"_id" : ObjectId("5ca20eba66324ffac2a7dc66"),
"ClientName" : "David",
"ClientAge" : 39,
"ClientExtraDetails" : {
"isEducated" : true,
"CountryName" : "AUS"
}
}Following is the query to search for nested keys in MongoDB
> db.searchForNestedKeysDemo.find({"ClientExtraDetails.CountryName":"UK"}).pretty();This will produce the following output
{
"_id" : ObjectId("5ca20ea366324ffac2a7dc65"),
"ClientName" : "Chris",
"ClientAge" : 29,
"ClientExtraDetails" : {
"isEducated" : false,
"CountryName" : "UK"
}
}
Updated on: 30-Jul-2019
600 Views
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