Mean Stack: How To Update A Function's Result To The Database?

I'm having a commenting system and I need to store the upvotes in the database whenever the upvote icon is clicked. The function I have increases the number but as soon as I refres

Solution 1:

You need to create a c.update(comment) method in your service that takes a comment to update and then calls a corresponding $http.put() method in your API to update the comment when the upvote button is clicked.

Update: One more potential issue - if you are not specifically creating a comment.upvotes property and setting it to 0 by default then your comment.upvotes += 1 might be adding one to null or undefined and not really adding one.