newest topics rss.

app/controllers/topics_controller.rb

@@ -3,14 +3,22 @@ class TopicsController < ApplicationController
   before_filter :find_topic, :only => [:show, :mark, :unmark]
   before_filter :find_user_topic, :only => [:edit, :update]
   respond_to :html, :js, :only => [:mark]
+  respond_to :html, :rss, :only => [:newest]
 
   def index
     @topics = Topic.active.page(params[:page])
   end
 
   def newest
     @topics = Topic.order_by([[:created_at, :desc]]).page(params[:page])
-    render :index
+    respond_with(@topics) do |format|
+      format.html { render :index }
+      format.rss do
+        @page_title = 'Newest Topics'
+        @channel_link = newest_topics_path
+        render :index, :layout => false
+      end
+    end
   end
 
   def my
@@ -72,15 +80,15 @@ def mark
     @topic.mark_by current_user
     respond_with(@topic) do |format|
       format.html { redirect_referrer_or_default @topic }
-      format.js { render :mark, :layout => false }
+      format.js { render :layout => false }
     end
   end
 
   def unmark
     @topic.unmark_by current_user
     respond_with(@topic) do |format|
       format.html { redirect_referrer_or_default @topic }
-      format.js { render :mark, :layout => false }
+      format.js { render :layout => false }
     end
   end
 

app/views/topics/index.haml

@@ -54,3 +54,9 @@
 
         - else
           = render :partial => 'shared/sidebar_login'
+        - if %w(newest).include?(action_name)
+          %section.box
+            %header Subscribe
+            - case action_name
+            - when
+              = link_to image_tag('rss.png'), newest_topics_path(:format => :rss)

app/views/topics/index.rss.builder

@@ -0,0 +1,25 @@
+xml.instruct!
+xml.rss :version => "2.0" do
+  xml.channel do
+    xml.title @page_title
+    xml.link @channel_link
+    xml.description
+    xml.lastBuildDate @topics.first.created_at.to_s(:rfc822) if @topics.any?
+
+    @topics.each do |topic|
+      xml.item do
+        xml.title topic.title
+        xml.description format_text(topic.content)
+        xml.pubDate topic.created_at.to_s(:rfc822)
+        xml.author topic.user.profile.name
+        xml.link topic_url(topic, :page => topic.last_page, :anchor => topic.last_anchor)
+        xml.guid topic_url(topic)
+        if topic.tags.present?
+          topic.tags.each do |tag|
+            xml.category tag
+          end
+        end
+      end
+    end
+  end
+end