MongoDB query to return only embedded document?

It is not possible to return only embedded document. However, it will return all the documents from a collection. Let us first implement the following query to create a collection with documents

>db.queryToEmbeddedDocument.insertOne({"UserName":"Larry","PostDetails":[{"UserMessage":"Hello","UserLikes":8},{"UserMessage":"Hi","UserLikes":6},{"UserMessage":"Good Morning","UserLikes":12},{"UserMessage":"Awesome","UserLikes":4}]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c988a9f330fd0aa0d2fe4bd") }

Following is the query to display all documents from a collection with the help of find() method

> db.queryToEmbeddedDocument.find().pretty();

This will produce the following output

{    "_id" : ObjectId("5c988a9f330fd0aa0d2fe4bd"),    "UserName" : "Larry",    "PostDetails" : [       {          "UserMessage" : "Hello",          "UserLikes" : 8       },       {          "UserMessage" : "Hi",          "UserLikes" : 6       },       {          "UserMessage" : "Good Morning",          "UserLikes" : 12       },       {          "UserMessage" : "Awesome",          "UserLikes" : 4       }    ] }

Following is the query to return all the documents from a collection

> db.queryToEmbeddedDocument.find({"PostDetails.UserLikes": {$gte: 8}},{PostDetails:1}).pretty();

This will produce the following output

{    "_id" : ObjectId("5c988a9f330fd0aa0d2fe4bd"),    "PostDetails" : [       {          "UserMessage" : "Hello",          "UserLikes" : 8       },       {          "UserMessage" : "Hi",          "UserLikes" : 6       },       {          "UserMessage" : "Good Morning",          "UserLikes" : 12       },       {          "UserMessage" : "Awesome",          "UserLikes" : 4       }    ] }

Look at the above sample output, we are getting all the documents while we want only those documents in which “UserLikes” are greater than or equal to 8.