Added shortcut is_cached method to Navigation instances and Navigation.objects; updat...

diff --git a/contrib/shipherd/models.py b/contrib/shipherd/models.py
index 72bd775..a95546d 100644 (file)
--- a/contrib/shipherd/models.py
+++ b/contrib/shipherd/models.py
@@ -56,13 +56,13 @@ class NavigationManager(TreeManager):
                        nodes_to_cache = []
                        host_node = None
                        for ancestor in ancestors:
-                               if self._is_cached(self.db, ancestor) or ancestor.num_navigation > 0:
+                               if self.is_cached(ancestor) or ancestor.num_navigation > 0:
                                        host_node = ancestor
                                        break
                                else:
                                        nodes_to_cache.append(ancestor)
                        
-                       if not self._is_cached(self.db, host_node):
+                       if not self.is_cached(host_node):
                                self._add_to_cache(self.db, host_node)
                        
                        # Cache the queryset instance for every node that was passed over, as well.
@@ -72,6 +72,9 @@ class NavigationManager(TreeManager):
                
                return hosted_navigation
        
+       def is_cached(self, node):
+               return self._is_cached(self.db, node)
+       
        def _add_to_cache(self, using, node, qs=None):
                key = getattr(node, 'pk', None)
                
@@ -192,6 +195,10 @@ class Navigation(TreeEntity):
                # Always fall back to whether the node has active children.
                return self.has_active_children(request)
        
+       def is_cached(self):
+               """Shortcut method for Navigation.objects.is_cached"""
+               return Navigation.objects.is_cached(self)
+       
        def has_active_children(self, request):
                for child in self.get_children():
                        if child.is_active(request):
@@ -205,9 +212,15 @@ class Navigation(TreeEntity):
        
        def save(self, *args, **kwargs):
                super(Navigation, self).save(*args, **kwargs)
+               
                if self._has_changed():
                        self._initial_data = model_to_dict(self)
-                       Navigation.objects.clear_cache(self)
+                       if self.is_cached():
+                               Navigation.objects.clear_cache(self)
+                       else:
+                               for navigation in self.get_ancestors():
+                                       if navigation.hosting_node and navigation.is_cached() and self.get_level() <= (navigation.get_level() + navigation.depth):
+                                               Navigation.objects.clear_cache(navigation)
        
        def delete(self, *args, **kwargs):
                super(Navigation, self).delete(*args, **kwargs)