scopes_antipattern.rb

# BAD: details of computing review goodness is exposed to controller
class MoviesController < ApplicationController
  def movies_with_good_reviews
    @movies = Movie.joins(:reviews).group(:movie_id).
      having('AVG(reviews.potatoes) > 3')
  end
  def movies_for_kids
    @movies = Movie.where('rating in ?', %w(G PG))
  end
end