json with nested assets

app/controllers/campaigns_controller.rb

@@ -7,7 +7,7 @@ class CampaignsController < ApplicationController
 
   def show
     respond_to do |format|
-      format.json { render json: @campaign }
+      format.json { render json: @campaign, include: [:videolistings,] }
       format.html { render html: @campaign }
     end
   end

app/models/campaign.rb

@@ -12,4 +12,5 @@ class Campaign < ActiveRecord::Base
     #TODO Make API Calls
   end
 
+
 end

app/models/videolisting.rb

@@ -4,6 +4,6 @@ class Videolisting < ActiveRecord::Base
   validates :producttypeid, presence: true
 
   def asseturls_array
-    self.asseturls.split(',').collect(&:strip)
+    self.asseturls.split(',').collect { |url| { asseturl: url.strip } }
   end
 end