Merge pull request jazzband#59 from PyKaB/patch-1

Make fast query with "count(*)" instead selecting all data

Author: Brandon Taylor

adminsortable/utils.py

@@ -1,4 +1,4 @@
 def get_is_sortable(objects):
-    if len(objects) > 1:
+    if objects.count() > 1:
         return True
     return False