Random record in Rails

random.rb

# Inspired from Sebastien Saunier

# models/production.rb
class Production < ActiveRecord::Base
  enum status: {active: 1, deactive: 0}
  validates_presence_of :status

  include Randomable
end

# app/models/concerns/randomable.rb
module Randomable
  extend ActiveSupport::Concern

  class_methods do
    def random(the_count = 1)
      records = offset(rand(count - the_count)).limit(the_count)
      the_count == 1 ? records.first : records
    end
  end
end

# rails console

2.2.0 :001 > Production.random
   (0.5ms)  SELECT COUNT(*) FROM "productions"
  Production Load (0.2ms)  SELECT  "productions".* FROM "productions"  ORDER BY "productions"."id" ASC LIMIT 1 OFFSET 1
 => #<Production id: 2, title: "abc", price: 23, description: nil, status: 1, created_at: "2015-11-04 05:58:43", updated_at: "2015-11-04 05:58:43">
 
2.2.0 :002 > Production.random(2)
   (0.2ms)  SELECT COUNT(*) FROM "productions"
  Production Load (0.4ms)  SELECT  "productions".* FROM "productions" LIMIT 2 OFFSET 1
 => #<ActiveRecord::Relation [#<Production id: 2, title: "abc", price: 23, description: nil, status: 1, created_at: "2015-11-04 05:58:43", updated_at: "2015-11-04 05:58:43">, #<Production id: 3, title: "def", price: nil, description: nil, status: 0, created_at: "2015-11-04 06:01:16", updated_at: "2015-11-04 06:01:16">]>