gistfile1.rb

  def generate_code
    generated_code = nil
    
    loop do
      srand(Time.now.to_f)
      chars = ("A".."Z").to_a + ("2".."9").to_a
      generated_code = ""
      1.upto(5) { |i| generated_code << chars[rand(chars.size - 1)] }

      break if Lead.count(:conditions => {:code => generated_code}) == 0
    end
    
    update_attribute(:code, generated_code)
  end