old_contents: from django.db import models
  
  # Create your models here.
  
new_contents: from django.contrib.contenttypes.models import ContentType
  from django.db.models import signals
  from tagging.models import TaggedItem
  
  def taggeditem_delete(sender, **kwargs):
      """
      Deletes TaggedItems for ALL deleted model instances
      Workaround for bug:
          http://code.google.com/p/django-tagging/issues/detail?id=162
      """
      deleted = kwargs['instance']
      try:
          id = int(deleted.pk)
      except ValueError:
          return
      ctype = ContentType.objects.get_for_model(deleted)
      item_tags = TaggedItem.objects.filter(
              content_type=ctype,
              object_id=id,
          )
      item_tags.delete()
  
  signals.post_delete.connect(taggeditem_delete)
  
subject: Delete tags for deleted items