gistfile1.builder

def MyClass

  module Transactional
    def delete_them
       db.delete
     end
  end

  # this looks for a transaction module, introspects the methods, 
  # adds new methods to MyClass which create transactions and then calls
  # it's namesake
  include DbRepository

end

module DbRepository
  def included(clazz)
    clazz.instance_eval do
      trx_module = clazz.const_get("Transactional")
      trx_module.methods.each {|m| DbRepository.wrap_method(clazz, trx_module, m}
    end
  end

  def wrap_method(target_clazz, trx_module, method_name)
    # Adds a method to target clazz which does transaction caretaking
    # and then calls method_name on trx_module
  end
end