title: render :update on Rails 3.1.0 gives me Missing Template update
body: <p>I'm working with <code>rails 3.1.0</code> and this is my first application on <code>3.1.0</code><br /></p>
  
  <p>I have a <code>remote</code> link: <br /></p>
  
  <pre><code>link_to "my link",{:controller=&gt;"my_controller",:action=&gt;"my_action"},:remote=&gt;true
  </code></pre>
  
  <p>and in <code>my_controller</code> I have <br /></p>
  
  <pre><code>def my_action
      @data = Data.all
      render :update do |page|
          page.replace_html "show_data",:partial=&gt;"data_partial"
      end
  end
  </code></pre>
  
  <p>but then in the log I get an error</p>
  
  <pre><code>ActionView::MissingTemplate (Missing template my_controller/update...
  </code></pre>
  
  <p>and I was checking at this post <br />
  <a href="http://wowkhmer.com/2011/09/19/unobtrusive-ajax-with-rails-31/" rel="nofollow">http://wowkhmer.com/2011/09/19/unobtrusive-ajax-with-rails-31/</a>
  <br />
  do I really need to use a <code>coffee script</code> or a <code>js.jrs</code> to do this thing ??</p>