Added a local cache to NavigationMapper - avoids some unpickling costs.

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

diff --git a/philo/contrib/shipherd/models.py b/philo/contrib/shipherd/models.py
index 9bba816..3655e51 100644 (file)
--- a/philo/contrib/shipherd/models.py
+++ b/philo/contrib/shipherd/models.py
@@ -2,6 +2,7 @@
 from UserDict import DictMixin
 from hashlib import sha1
 
+from django.contrib.sites.models import Site
 from django.core.cache import cache
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import NoReverseMatch
@@ -26,13 +27,12 @@ class NavigationMapper(object, DictMixin):
                self._cache = {}
        
        def __getitem__(self, key):
-               return Navigation.objects.get_for_node(self.node, key)
-               #if key not in self._cache:
-               #       try:
-               #               self._cache[key] = Navigation.objects.get_for_node(self.node, key)
-               #       except Navigation.DoesNotExist:
-               #               self._cache[key] = None
-               #return self._cache[key]
+               if key not in self._cache:
+                       try:
+                               self._cache[key] = Navigation.objects.get_for_node(self.node, key)
+                       except Navigation.DoesNotExist:
+                               self._cache[key] = None
+               return self._cache[key]
 
 
 def navigation(self):
@@ -63,15 +63,19 @@ class NavigationManager(models.Manager):
                        }
                        navs = self.filter(key=key, **kwargs).select_related('node').order_by('-node__%s' % opts.level_attr)
                        nav = navs[0]
-                       roots = nav.roots.all().select_related('target_node')
+                       roots = nav.roots.all().select_related('target_node').order_by('order')
                        item_opts = NavigationItem._mptt_meta
                        by_pk = {}
                        tree_ids = []
                        
+                       site_root_node = Site.objects.get_current().root_node
+                       
                        for root in roots:
                                by_pk[root.pk] = root
                                tree_ids.append(getattr(root, item_opts.tree_id_attr))
                                root._cached_children = []
+                               root.target_node.get_path(root=site_root_node)
+                               root.navigation = nav
                        
                        kwargs = {
                                '%s__in' % item_opts.tree_id_attr: tree_ids,
@@ -85,6 +89,7 @@ class NavigationManager(models.Manager):
                                parent_pk = getattr(item, '%s_id' % item_opts.parent_attr)
                                item.parent = by_pk[parent_pk]
                                item.parent._cached_children.append(item)
+                               item.target_node.get_path(root=site_root_node)
                        
                        cached = roots
                        cache.set(cache_key, cached)
@@ -167,13 +172,15 @@ class NavigationItem(TreeEntity, TargetURLModel):
                        # the same as the request path, check whether the target node is an ancestor
                        # of the requested node. If so, this is active unless the target node
                        # is the same as the ``host node`` for this navigation structure.
-                       try:
-                               host_node = self.get_root().navigation.node
-                       except AttributeError:
-                               pass
-                       else:
-                               if self.target_node != host_node and self.target_node.is_ancestor_of(request.node):
-                                       return True
+                       root = self
+                       
+                       # The common case will be cached items, whose parents are cached with them.
+                       while root.parent is not None:
+                               root = root.parent
+                       
+                       host_node_id = root.navigation.node_id
+                       if self.target_node.pk != host_node_id and self.target_node.is_ancestor_of(request.node):
+                               return True
                
                return False