title: Can I do STI and still use polymorphic path helpers?
body: <p>I am using Single Table Inheritance and have comments on all the subclasses. I am only using 1 controller for all the different STI types. When the form_for helper generates a URL for a subtype it tries to use a helper for the subtype, but I want it to use the helper for the parent. </p>
  
  <p>This is the error I get:</p>
  
  <pre><code>undefined method `subclasstypename_comments_path' for #&lt;ActionView::Base:0x41ef27c&gt;
  </code></pre>
  
  <p>The path helper it 'should' use is</p>
  
  <pre><code>parentclasstypename_comments_path
  </code></pre>