title: saving multiple tables at once in rails
body: <p>I have an action that update three tables at once like this:</p>
  
  <pre><code>    def action_save
          @user.update(param_param_list1)
          @application.update(param_list2)
          @college.update(param_list3)
      end
  </code></pre>
  
  <p>but to make the program better, I want to either save all three together at once or not at all</p>