Add Book.ancestor m2m.

[wolnelektury.git] / apps / social / utils.py

diff --git a/apps/social/utils.py b/apps/social/utils.py
index 96f0ca0..c6a9353 100755 (executable)
--- a/apps/social/utils.py
+++ b/apps/social/utils.py
@@ -1,7 +1,12 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
 from django.db.models import Q
-from catalogue.models import Tag
+from catalogue.models import Book, Tag
 from catalogue import utils
 from catalogue.tasks import touch_tag
+from social.models import Cite
 
 
 def likes(user, work):
@@ -32,4 +37,9 @@ def set_sets(user, work, sets):
         touch_tag(shelf)
 
     # delete empty tags
-    Tag.objects.filter(category='set', user=user, book_count=0).delete()
+    Tag.objects.filter(category='set', user=user, items=None).delete()
+
+
+def cites_for_tags(tags):
+    """Returns a QuerySet with all Cites for books with given tags."""
+    return Cite.objects.filter(book__in=Book.tagged.with_all(tags))