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: "%s".') % tag_name)
if len(tag_names) > 1:
raise AttributeError(_('Multiple tags were given: "%s".') % tag_name)
tag_name = tag_names[0]
if settings.FORCE_LOWERCASE_TAGS:
tag_name = tag_name.lower()
tag, created = self.get_or_create(slug=slugify(tag_name),
defaults={'name': tag_name})
if not created:
# check if there is a preferred synonym for this tag
try:
related_tag = RelatedTag.objects.get(tag=tag, relation_type='=>')
except RelatedTag.DoesNotExist:
pass
else:
# there is a preferred synonym; use it instead of the original
tag = related_tag.related_tag
ctype = ContentType.objects.get_for_model(obj)
TaggedItem._default_manager.get_or_create(
tag=tag, content_type=ctype, object_id=obj.pk)
def _save(self, **kwargs): # signal, sender, instance):
"""
Save tags back to the database
"""
tags = self._get_instance_tag_cache(kwargs["instance"])
Tag.objects.update_tags(kwargs["instance"], tags)
if self.relate:
RelatedTag.objects.relate_all(tags)
if self.category:
cat_tag, c = Tag.objects.get_or_create(slug=slugify(self.category), defaults={"name": self.category})
RelatedTag.objects.relate(cat_tag, ">", tags)
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
super(Tag, self).save(*args, **kwargs)