+def _post_delete_handler(sender, instance, **kwargs):
+ """ refresh Book on BookMedia delete """
+ if sender == Collection:
+ delete_from_cache_by_language(permanent_cache, 'catalogue.collection:%s/%%s' % instance.slug)
+ delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
+post_delete.connect(_post_delete_handler)
+
+