Merge remote branch 'melinath/master'

[philo.git] / contrib / shipherd / models.py

diff --git a/contrib/shipherd/models.py b/contrib/shipherd/models.py
index 8efc57a..654f5f8 100644 (file)
--- a/contrib/shipherd/models.py
+++ b/contrib/shipherd/models.py
@@ -148,18 +148,19 @@ class NavigationManager(models.Manager):
                # about that. TODO: Benchmark it.
                caches = self.__class__._cache[self.db][node].values()
                
-               items = []
+               target_pks = set()
                
                for cache in caches:
-                       items += cache['items']
+                       target_pks |= set([item.target_node_id for item in cache['items']])
                
                # A distinct query is not strictly necessary. TODO: benchmark the efficiency
                # with/without distinct.
-               targets = list(Node.objects.filter(shipherd_navigationitem_related__in=items).distinct())
+               targets = list(Node.objects.filter(pk__in=target_pks).distinct())
                
                for cache in caches:
                        for item in cache['items']:
-                               item.target_node = targets[targets.index(item.target_node)]
+                               if item.target_node_id:
+                                       item.target_node = targets[targets.index(item.target_node)]
        
        def clear_cache(self):
                self.__class__._cache.pop(self.db, None)