signaes

require 'active_support/testing/time_helpers'

# the class below could have any name
class Tempo 
  include ActiveSupport::Testing::TimeHelpers
end

# any desidered date
desired_date = Date.today - 2.days

synth

class AddFieldsToDelayedJobs < ActiveRecord::Migration
  def change
    add_column :delayed_jobs, :signature, :string
    add_column :delayed_jobs, :args, :text
  end
end

easierbycode

#first we create a subclass of class string
class MyString < String
end

MyString.new
# => ""

#now we are going to override this method by some Ruby magic
MyString.class_eval do
  def empty?