title: @link decorator in django rest framework as a list controller
body: <p>so i want to filter all the sales invoices using url .. e.g.</p>
  
  <pre><code>/api/v1/invoice/sales/
  </code></pre>
  
  <p>i think the best way to do this is by using @link method in the viewset. here is my code ..</p>
  
  <pre><code>@link()
  def sales(self, request, pk):
      qs = Invoice.objects.filter(is_sales=True)
      serializer = InvoiceSerializer(qs)
      return Response(serializer.data)
  </code></pre>
  
  <p>but when i go to '/api/v1/invoice/sales/', and use breakpoints, the script doesn't stop at any point..</p>
  
  <p>what am i doing wrong here?</p>
  
  <p>//mouse</p>