Question

My application has a user model with two integer columns, :votes and :badges, in addition to the usual :id and :timestamp columns.

Currently, the default scope for users is:

default_scope order: 'users.created_at DESC'

How can I update the default scope to order by a ranking algorithm made up of :votes :badges?

My algorithm is:

ranking = 2 * votes + badges

What is the best way to do this?

I expected to be able to create a method in the model as follows, but this doesn’t work

def ranking
  2 * self.votes + self.badges
end

Do I need to create a ranking column in my database?
Thanks very much for your help!

Answer 1

You should be able to write

default_scope order("votes * 2 + badges")