def update_note_tags(sender, instance, **kwargs):
note_instance = instance
# check if note has already been created
if instance.pk:
# Update tags if note content has changed
old_note_instance = Note.objects.get(pk=note_instance.pk)
if note_instance.content != old_note_instance.content:
new_tags = set(Note.parsed_tags(note_instance.content))
old_tags = set([t.keyword for t in old_note_instance.tags.all()])
# Add tags new to the note
tags_to_add = new_tags.difference(old_tags)
tag_instances = []
for t in tags_to_add:
tag_instance, created = Tag.objects.get_or_create(keyword=t)
tag_instances.append(tag_instance)
note_instance.tags.add(*tag_instances)
# Remove tags no longer present in note
tags_to_remove = old_tags.difference(new_tags)
tags_to_remove_set = Tag.objects.filter(keyword__in=tags_to_remove)
note_instance.tags.remove(*tags_to_remove_set.all())
remove_loose_tags(tag_queryset=tags_to_remove_set)
def update_created_note_tags(sender, instance, created=False, **kwargs):
note_instance = instance
if created:
tag_instances = []
# If Note is created, create associated Tags
for t in Note.parsed_tags(note_instance.content):
tag_instance, created = Tag.objects.get_or_create(keyword=t)
tag_instances.append(tag_instance)
note_instance.tags.add(*tag_instances)
