report_sample.rb

 class RegistrationReport 
   
   def initialize(id) 
      @id = id
   end 
  
   def application_details 
     Registration.find(@id).programmes.map {|i|  
       [i.course_level_name,i.partner_name, i.partner_type].join("-") 
     }.join(",\n")
   end   
  end 
 
 class Registration < ActiveRecord 

  def registration_report
    @registration_report ||= RegistrationReport.new(id)
  end

  def method_missing(method_name, *arguments, &block)
    if registration_report.respond_to?(method_name)
      registration_report.send(method_name)
    else
      super
    end
  end
 end