ActiveRecord: Enhanced Query Objects

ar_enhanced_query_objects.rb

# Hamed Asghari post: http://hasghari.github.io/2013/09/15/active-record-enhanced-query-objects.html

class PopularProductQuery
  def initialize(relation = Product.scoped)
    @relation = relation.extending(Scopes)
  end

  def popular(time)
    @relation.with_recent_activity(time).with_available_reviews
  end

  module Scopes
    def with_recent_activity(time)
      joins(:reviews).where(reviews: { created_at: time..Time.now })
    end

    def with_available_reviews
      joins(:reviews).where(reviews: { available: true })
    end
  end
end