code: def list(self, request, *args, **kwargs):
          
          return super(DefaultPriceListItemViewSet, self).list(request, *args, **kwargs)
docs: To get a list of default price list items, run **GET** against */api/default-price-list-items/*
          as authenticated user.
  
          Price lists can be filtered by:
           - ?key=<string>
           - ?item_type=<string> has to be from list of available item_types
             (available options: 'flavor', 'storage', 'license-os', 'license-application', 'network', 'support')
           - ?resource_type=<string> resource type, for example: 'OpenStack.Instance, 'Oracle.Database')