Return specific MongoDB embedded document

Use $unwind twice for specific embedded document in MongoDB. Let us create a collection with documents −

> db.demo631.insert( ...    { ...       id: "101", ...       Info1: [ ...          { ...             CountryName : "US", ...             Info2 : [ ...                { ...                   Name:"Chris", ...                   Age:24 ...                },{ ... ...                      Name:"Bob", ..                     . Age:22 ...                } ...             ] ...          } ...       ] ...    } ... ); WriteResult({ "nInserted" : 1 })

Display all documents from a collection with the help of find() method −

> db.demo631.find();

This will produce the following output −

{ "_id" : ObjectId("5e9b0eb16c954c74be91e6bf"), "id" : "101", "Info1" : [ { "CountryName" : "US", "Info2" : [ { "Name" : "Chris", "Age" : 24 }, { "Name" : "Bob", "Age" : 22 } ] } ] }

Following is the query to return specific MongoDB embedded document −

> db.demo631.aggregate([ ...    { "$unwind": "$Info1" }, ...    { "$unwind": "$Info1.Info2" }, ...    { "$match": { "Info1.Info2.Age": 22 } } ... ])

This will produce the following output −

{ "_id" : ObjectId("5e9b0eb16c954c74be91e6bf"), "id" : "101", "Info1" : { "CountryName" : "US", "Info2" : { "Name" : "Bob", "Age" : 22 } } }