Database
[{"postId":"123","authorId":"1","post":{"authorName":"Hafiz",heading:"Dhaka Tribune","message":"They did this","likes":2,"likedUsers":["2"]}},{"postId":"124","authorId":"2","post":{"authorName":"Hafiz",heading:"Dhaka Tribune","message":"They did this","likes":1,"likedUsers":["1","5"]}}]
Query
db.collection.update({postId:"123",authorId:"1"},{$inc:{"post.likes":1},$push:{"post.likedUsers":"3"}})