get number of views

Hey guys, I just build a social app where users can post videos, share image and text, users can like, share and comment on post, but I want a situation to show the numbers of view on a post.

Please how do I achieve this?

Everytime the post comes in to view, check if the currenr user has already "seen" it. If not, add a new item. Incrementing count on every seen would inflate the view count exponentially due to duplicity.

Maybe add an array attribute in the same post document, or create a relation with a collection or a complete separate collection for the same.

An array based attribute could get harder to manage though if the size grows substantially.