Copy ActiveRecord model values to another model

copyable.rb

module Copyable
  attr_writer :copyable_attributes

  def copyable_attributes
    @copyable_attributes ||= attributes.keys.reject { |k, v| k.to_s =~ /^id$|_id$|^created_at$|^updated_at$/ }
  end
  
  def copy(options={})
    class_sym = options.delete :class
    other = options.delete :other
    
    if not other
      if class_sym
        other_class = Kernel.const_get class_sym.to_s.classify
      else
        other_class = self.class
      end
      other = other_class.new
    end
    
    copyable_attributes.each do |k|
      other.write_attribute k, attributes[k]
    end
    
    other
  end
end