models.py 文件源码

def add_tag(self, obj, tag_name):
        """
        Associates the given object with a tag.
        """
        tag_names = parse_tag_input(tag_name)
        if not len(tag_names):
            raise AttributeError(_('No tags were given: "%(name)s".') % {
                'name': tag_name})
        if len(tag_names) > 1:
            raise AttributeError(_('Multiple tags were given: "%(name)s".') % {
                'name': tag_name})
        tag_name = tag_names[0]
        if settings.FORCE_LOWERCASE_TAGS:
            tag_name = tag_name.lower()
        tag, created = self.get_or_create(name=tag_name)
        ctype = ContentType.objects.get_for_model(obj)
        TaggedItem._default_manager.get_or_create(
            tag=tag, content_type=ctype, object_id=obj.pk)