title: How to "update_attributes" without executing "before_save"?
body: <p>I have a <code>before_save</code> in my <code>Message</code> model defined like this:</p>
  
  <pre><code>   class Message &lt; ActiveRecord::Base
       before_save lambda { foo(publisher); bar }
     end
  </code></pre>
  
  <p>When I do:</p>
  
  <pre><code>   my_message.update_attributes(:created_at =&gt; ...)
  </code></pre>
  
  <p><code>foo</code> and <code>bar</code> are executed.</p>
  
  <p>Sometimes, I would like to update message's fields without executing <code>foo</code> and <code>bar</code>.</p>
  
  <p>How could I update, for example, the <code>created_at</code> field (in the database) without executing <code>foo</code> and <code>bar</code> ?</p>