Place the following in the view:

   1  <% [:info, :error].each do |key| %>
   2      <% if flash[key] %>
   3      <div class="<%= key %>" id="flash">
   4        <%= flash[key] %>
   5      </div>
   6      <% end %>
   7    <% end %>
   8  	

The HTML , in a layout file, for example application.html.erb:

   1  <div id="error-message" style="display:none">
   2  </div>

The JavaScript, rendered by for example create.js.erb:

   1  <% if !@category.valid? %>
   2  <%
   3    errors = <<ERR
   4    <p>Please fix the following errors:</p>
   5    <ul>
   6      #{@category.errors.collect{|err| "<li>" + err[0] + " " + err[1] + "</li>" } }
   7    </ul>
   8  ERR
   9  %>
  10  $('#error-message').html('<%= escape_javascript(errors) %>');
  11  $('#error-message').show();
  12  <% else %>
  13  $('#error-message').hide();
  14  <% end %>

   1  <input name="authenticity_token" value="<%= form_authenticity_token %>" type="hidden" />

or

   1  <%= token_tag %> 

If you like Atom more than RSS use the atom_feed_helper.

Here’s the template, modify it to fit your needs. I know there are plugins and other ways of doing this, but I hate code that gets too abstract:

   1  <?xml version="1.0"?>
   2  <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   3    <channel>
   4      <atom:link href="http://xxxxxxx" rel="self" type="application/rss+xml" />
   5      <title>Code Snippets - Aktagon</title>
   6      <link>http://snippets.aktagon.com/</link>
   7      <description>Share your code with the world. Allow others to review and comment.</description>
   8      <language>en-us</language>
   9      <pubDate><%= @snippets[0].created_at.rfc822 %></pubDate>
  10      <lastBuildDate><%= @snippets[0].created_at.rfc822 %></lastBuildDate>
  11      <docs>http://blogs.law.harvard.edu/tech/rss</docs>
  12      <generator>Aktagon Snippets</generator>
  13   <% for snippet in @snippets %>
  14      <item>
  15        <title><![CDATA[<%= snippet.title %>]]></title>
  16        <link><%= snippet_url(snippet) %></link>
  17        <description><![CDATA[<%= snippet.rendered_body %>]]></description>
  18        <pubDate><%= @snippets[0].created_at.rfc822 %></pubDate>
  19        <guid><%= snippet_url(snippet) %></guid>
  20  	  <% for tag in snippet.tags%>
  21  		<category domain="http://snippets.aktagon.com/snippets"><![CDATA[<%= tag.name %>]]></category>
  22  	  <% end%>
  23      </item>
  24  <% end %>
  25    </channel>
  26  </rss>
  27  

Remember to serve the feed with the correct HTTP headers.

It also helps to have an auto-discovery tag inside the head tag:

   1  <link rel="alternate" type="application/rss+xml" title="RSS feed" href="http://<%= request.host %>/rss/" />

Add cache => true to combine JavaScript and CSS files and improve page load times.

See changeset 6164 for more information

   1  <%= stylesheet_link_tag     'all',      :cache => true %>
   2      <%= javascript_include_tag  :defaults,  :cache => true %>