title: Django models, queryset using get_FOO_display()
body: <p>Consider a Django model that contains a CharField with choices.</p>
  
  <p>I know I can do: </p>
  
  <pre><code>Product.objects.values('product_code').annontate(count=Count('product_code'))
  </code></pre>
  
  <p>But consider 'product_code' has choices, how can have the queryset return the result of get_product_code_display() and the count of them?</p>