title: send back a variable with before_save
body: <p>Ok i am trying to create a before_save that checks to see that fields change and return them in a variable like this</p>
  
  <pre><code>if @user.update_attributes(params[:user]) 
    send_email_update(@user)
    logger.info @changed
  </code></pre>
  
  <p>In the model i have a before save </p>
  
  <pre><code> before_save :check_changes
  
   def check_changes
     @changed = self.changed
   end
  </code></pre>
  
  <p>Is there a way to do this in any way...basically sending back a variable with the changed fields or if there is a suggestion on how to tackle something like this</p>