Execute model's method in command console or with a cronjob

03 August 2015 
class Booking < ActiveRecord::Base      
  def self.pay_the_keepers        
    puts "It's time to pay the keepers!"      
  end
end

$ rails runner Booking.pay_the_keepers

whenever schedule task https://github.com/javan/whenever

every 1.day, at: '23:00' do
    runner 'Booking.pay_the_keepers"
end