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Generate codes for a online gift voucher

/ Published in: Rails
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Can be used to generate a random code for an online voucher. You just need to set VOUCHER_CODE_LENGTH in your environment.rb or similar.

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  1. Class Voucher < ActiveRecord::Base
  2.   before_validation_on_create :generate_code
  3.  
  4.   def generate_code
  5.     code = create_code
  6.  
  7.     #ensure that the voucher code is unique.
  8.     @voucher = Voucher.find(:first, :conditions => "code = '#{code}'")
  9.     while !@voucher.nil?
  10.       code = create_code
  11.       @voucher = Voucher.find(:first, :conditions => "code = '#{code}'")
  12.     end
  13.  
  14.     self.code = code
  15.   end
  16.  
  17.   protected
  18.   def create_code
  19.     chars = ("A".."Z").to_a
  20.  
  21.     code = ""
  22.     1.upto(VOUCHER_CODE_LENGTH) { |i| 
  23.       code << chars[rand(chars.size-1)] 
  24.       if i % 4 == 0 && i < VOUCHER_CODE_LENGTH
  25.         code << "-"
  26.       end
  27.     }
  28.     return code
  29.   end
  30. end

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