Filtering MongoDB data on the front end

I have little problems with MongoDb. I have 2 collections: Auctions and Users. In the "Users" i store obviously the users (mail, name...etc) In the Auctions i store products (creationdate, createdBy, FollowedBy, Invitations, image). Now, i want to show in every user's dashboard, only the products that he follows (his name is stored in the ""FOllowedBy" when he clicks on the botton Follow). If I have to filter on the backend, all it's clear, instead i want to load all the data from the DB and then filter that on the front end with angularJs.

With a simple field like createdBy it's easy: If i Have an user called "Alex"(for example) i can show the data only if createdBy match with Alex (or every other user). But the same thing doesn't work with an array field like "FollowedBy". If in the product "Table" createdby: "Mark", FollowedBy: "Alex" and "Jack", i can easy filter all the product to show only Mark's product, but i don't understand how to show only the products followed by Alex, cause this field is an array.

via Marco Pagano