Just a question about a generic social app. Using mongodb , 3 entities ,like comment and post . how do I display posts in feeds with comment count and like count . since its mongodb I can't do joins . the other way is to maintain a data structure on the server side . or yet another way would be making 2 extra queries to db for retrieving like and comments count . Any other way this is possible or is it possible to form a query in mongo db to retrieve all 3 at the same time???