Question

I have the model

class Article < ActiveRecord::Base
  belongs_to :category
end

class Category < ActiveRecord::Base
  has_one :article
end

In the controller I am fetching all category names

@categories = Category.order('name')

How could I fetch all categories and sort them by the count of most used?

Answer 1

I think you should change has_one :article to has_many :articles.

So my version:

Category.joins(:articles)
        .select("categories.*, count(articles.id) as counter")
        .order("counter")