Running Number in Ruby

running_number.rb

class RunningNumber
  attr_accessor :prefix, :current

  def initialize(prefix = 'RUN', current = '000000')
    @prefix = prefix
    @current = current
  end

  def current
    @prefix + @current
  end

  def next
    @prefix + @current.next!
  end

  def reset_current_to(current = '000000')
    @current = current
    puts "RunningNumber has reset to " + @prefix + @current
  end

  alias_method :reset, :reset_current_to
end