code: def get_filter_class(self, view, queryset=None):
          
          filter_class = getattr(view, 'filter_class', None)
          if filter_class:
              filter_model = filter_class.Meta.model
  
              assert issubclass(queryset._document, filter_model), \
                  'FilterSet model %s does not match queryset model %s' % \
                  (filter_model, queryset.model)
  
              return filter_class
          return
docs: Return the django-filters `FilterSet` used to filter the queryset.