title: Nested resource with multiple parent resources in Rails 3
body: <p>I want to create a model to store comments related to articles. I have a strong feeling that in the future I will want comments on other objects in the app too. How do I design commenting in my app so that it will be forward compatible with adding new parent objects. I want to avoid a scenario where have multiple controllers/models for each object to comment relationship.</p>
  
  <p>After watching Ryan Bates screen cast on <a href="http://railscasts.com/episodes/139-nested-resources" rel="noreferrer">Nested Resource</a> I have a firm grasp on how tp nest a resource under a single parent. How do I achieve this under 2 or more parent resources? </p>
  
  <p>Thanks!</p>