          except (ObjectDoesNotExist, TypeError, ValueError):
              self.fail('does_not_exist')
  
      def to_representation(self, value):
          request = self.context.get('request', None)
          format = self.context.get('format', None)
  
          assert request is not None, (
              "`%s` requires the request in the serializer"
              " context. Add `context={'request': request}` when instantiating "
              "the serializer." % self.__class__.__name__
          )
  
 
</s>
        assert 'request' in self.context, (
          except (ObjectDoesNotExist, TypeError, ValueError):
              self.fail('does_not_exist')
  
      def to_representation(self, value):
        assert 'request' in self.context, (
        assert 'request' in self.context, (
        assert 'request' in self.context, (
        assert 'request' in self.context, (
              "`%s` requires the request in the serializer"
              " context. Add `context={'request': request}` when instantiating "
              "the serializer." % self.__class__.__name__
          )
  
keep keep keep keep replace replace replace replace keep keep keep keep keep
 Allow relative style hyperlinked URLs
rest_framework/relations.py