Rails-按模型方法结果订购记录

Question

I have the User model with the following method:

def like_dislike_proportion
  self.likes.to_f / self.dislikes.to_f
end

Where self.likes and self.dislikes both return an Integer. I want to make a ranking with the top 10 users with the biggest like/dislike proportion, and the bottom 10, with the lowest proportion.

I tried using

User.order('like_dislike_proportion DESC').limit(10)

But it doesn't work, because the like_dislike_proportion is not a persistent attribute in the database.

How can I solve this?

Answer 1

ranking = User.all.map { |u| 
    {name: u.name, proportion: (u.likes.to_f/u.dislikes.to_f)} 
}.sort_by { |r| r[:proportion] }