Guest comments off homepage & Users can control guest comments for their tracks

app/controllers/assets_controller.rb

@@ -247,6 +247,19 @@ def stats
     end
   end
 
+  FEED_SQL = <<-ESQL
+    SELECT DISTINCT a.* FROM assets a INNER JOIN users u ON (a.user_id = u.id) INNER JOIN followings f ON (f.user_id = u.id) WHERE f.follower_id = :user_id ORDER BY a.created_at DESC LIMIT 15
+  ESQL
+
+  def listen_feed
+    # Note that there is a method User#new_tracks_from_followees. Ideally that method should be refactored
+    # to use this query kind rather than a double-query and IN subquery and then this method can call it.
+    @tracks = Asset.find_by_sql( [FEED_SQL,{:user_id => @user.id}] )
+    respond_to do |format|
+      format.rss
+    end
+  end
+
   protected
 
   def not_found

app/views/assets/listen_feed.rss.builder

@@ -0,0 +1,24 @@
+xml = ::Builder::XmlMarkup.new( :indent => 2 )
+
+xml.instruct! :xml, :version => "1.0", :encoding => "UTF-8"
+xml.rss :version => "2.0", "xmlns:media" => "http://search.yahoo.com/mrss/" do
+  xml.channel do
+    xml.title "Listen feed for #{@user.login}"
+    xml.description "A podcast feed of new tracks by artists followed by #{@user.login}"
+    xml.link user_url( @user )
+    xml.generator "alonetone.com"
+
+    @tracks.each do |track|
+      xml.item do
+        xml.title "#{track.title} by #{track.user.login}"
+        xml.link user_track_url( track.user, track )
+        xml.pubDate track.created_at.rfc822
+        xml.description do |description|
+          description.cdata!( track.description )
+        end
+        xml.tag!( "enclosure", :url => track.public_mp3, :length => track.size, :type => "audio/mpeg" )
+        xml.tag!( "media:content", :duration => track.length )
+      end
+    end
+  end
+end

config/routes.rb

@@ -33,6 +33,8 @@
   # latest mp3s uploaded site-wide
   map.latest '/latest/:latest', :controller => 'assets', :action => 'latest'
 
+  map.listen_feed '/users/:login/listenfeed.:format', :controller => 'assets', :action => 'listen_feed'
+
   map.radio_home 'radio', :controller => 'assets', :action => 'radio'
   map.radio 'radio/:source/:per_page/:page', :controller => 'assets', :action => 'radio', :defaults =>{:per_page => 5, :page => 1}