JSON output for Layar custom icons per feed

app/controllers/posts_controller.rb

@@ -13,7 +13,7 @@ class PostsController < ApplicationController
 
     layar_response = {
       :layer =>         @layer.layar_name,
-      :hotspots =>      @posts.collect { |p| post_to_poi(p) },
+      :hotspots =>      @posts.collect { |p| post_to_poi(p, Subscription.where(:feed_id => p.feed_id, :layer_id => @layer.id).first) },
       :errorCode =>     0, # OK
       :errorString =>   "OK",
       :radius =>        params[:radius].to_f

app/helpers/posts_helper.rb

@@ -1,8 +1,8 @@
 module PostsHelper
-  def post_to_poi(post)
+  def post_to_poi(post, subscription)
     # http://layar.com/documentation/browser/api/getpois-response/
     {
-      :id => post._id,
+      :id => post.id,
       :imageURL => "%s%s/assets/layar-icons/tal-logo-100.png" % [ request.protocol, request.env['HTTP_HOST'] ],
       :anchor =>  {
         :geolocation => {
@@ -23,8 +23,14 @@ module PostsHelper
           :contentType =>   "text/html",
           :method =>        "GET",
           :activityType =>  1
-        }
-      ]
+        },
+      ],
+      :object => {
+        :contentType => "image/vnd.layar.generic",
+        :url => subscription.icon_url,
+        :reducedURL => subscription.icon_url,
+        :size => 120        
+      }
     }
   end