Eliminated (Generic)ForeignKey evaluations in shipherd's NavigationManager.update_cac...

[philo.git] / philo / models / nodes.py

diff --git a/philo/models/nodes.py b/philo/models/nodes.py
index 93f772a..9309a42 100644 (file)
--- a/philo/models/nodes.py
+++ b/philo/models/nodes.py
@@ -31,24 +31,28 @@ class Node(SlugTreeEntity):
        :class:`Node`\ s are the basic building blocks of a website using Philo. They define the URL hierarchy and connect each URL to a :class:`View` subclass instance which is used to generate an HttpResponse.
        
        """
-       view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter)
-       view_object_id = models.PositiveIntegerField()
+       view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter, blank=True, null=True)
+       view_object_id = models.PositiveIntegerField(blank=True, null=True)
        #: :class:`GenericForeignKey` to a non-abstract subclass of :class:`View`
        view = generic.GenericForeignKey('view_content_type', 'view_object_id')
        
        @property
        def accepts_subpath(self):
                """A property shortcut for :attr:`self.view.accepts_subpath <View.accepts_subpath>`"""
-               if self.view:
-                       return self.view.accepts_subpath
+               if self.view_object_id and self.view_content_type_id:
+                       return ContentType.objects.get_for_id(self.view_content_type_id).model_class().accepts_subpath
                return False
        
        def handles_subpath(self, subpath):
-               return self.view.handles_subpath(subpath)
+               if self.view:
+                       return self.view.handles_subpath(subpath)
+               return False
        
        def render_to_response(self, request, extra_context=None):
                """This is a shortcut method for :meth:`View.render_to_response`"""
-               return self.view.render_to_response(request, extra_context)
+               if self.view:
+                       return self.view.render_to_response(request, extra_context)
+               raise Http404
        
        def get_absolute_url(self, request=None, with_domain=False, secure=False):
                """
@@ -122,7 +126,7 @@ class View(Entity):
        #: A generic relation back to nodes.
        nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id')
        
-       #: Property or attribute which defines whether this :class:`View` can handle subpaths. Default: ``False``
+       #: An attribute on the class which defines whether this :class:`View` can handle subpaths. Default: ``False``
        accepts_subpath = False
        
        def handles_subpath(self, subpath):