filtering comments on user

serializers.py

class CommentRelatedField(serializers.ManyRelatedField):
    def to_native(self, value):
        return CommentSerializer(value).data


    def field_to_native(self, obj, field_name):
        try:
            if self.source == '*':
                return self.to_native(obj)

            source = self.source or field_name
            value = obj

            for component in source.split('.'):
                value = get_component(value, component)
                if value is None:
                    break
        except ObjectDoesNotExist:
            return None

        if value is None:
            return None

        if self.context['request'].user.groups.filter(name="Internal"):
            qs = value.all()
        else:
            qs = value.exclude(user__groups__name="Internal")

        if self.many:
            return [self.to_native(item) for item in qs]
        return self.to_native(value)