def isTagList(field_data, all_data):
"""
Validates that ``field_data`` is a valid list of tags.
"""
for tag_name in parse_tag_input(field_data):
if len(tag_name) > settings.MAX_TAG_LENGTH:
raise ValidationError(
_('Each tag may be no more than %s characters long.') % settings.MAX_TAG_LENGTH)
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 isTag(field_data, all_data):
"""
Validates that ``field_data`` is a valid tag.
"""
tag_names = parse_tag_input(field_data)
if len(tag_names) > 1:
raise ValidationError(_('Multiple tags were given.'))
elif len(tag_names[0]) > settings.MAX_TAG_LENGTH:
raise ValidationError(
_('A tag may be no more than %s characters long.') % settings.MAX_TAG_LENGTH)
def update_tags(self, obj, tag_names):
"""
Update tags associated with an object.
"""
ctype = ContentType.objects.get_for_model(obj)
current_tags = list(self.filter(items__content_type__pk=ctype.pk,
items__object_id=obj.pk))
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 for tag in current_tags \
if tag.name not in updated_tag_names]
if len(tags_for_removal):
TaggedItem._default_manager.filter(content_type__pk=ctype.pk,
object_id=obj.pk,
tag__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.get_or_create(name=tag_name)
TaggedItem._default_manager.create(tag=tag, object=obj)
