def clean(self, value):
value = super(TagField, self).clean(value)
if value == u'':
return value
for tag_name in parse_tag_input(value):
if len(tag_name) > settings.MAX_TAG_LENGTH:
raise forms.ValidationError(
_('Each tag may be no more than %s characters long.') % settings.MAX_TAG_LENGTH)
return value
def update_tags(self, obj, tag_names):
"""
Update tags associated with an object.
"""
current_tags = list(self.filter(object=obj))
updated_tag_names = parse_tag_input(tag_names)
if settings.FORCE_LOWERCASE_TAGS:
updated_tag_names = [t.lower() for t in updated_tag_names]
# Remove tags which no longer apply
tags_for_removal = [tag.name for tag in current_tags if tag.name not in updated_tag_names]
if len(tags_for_removal):
self.filter(object=obj, name__in=tags_for_removal).delete()
# Add new tags
current_tag_names = [tag.name for tag in current_tags]
for tag_name in updated_tag_names:
if tag_name not in current_tag_names:
tag, created = self.create(name=tag_name, object=obj)
