From 7659bf23d3ba0ad18338329ecf066b70b6585efc Mon Sep 17 00:00:00 2001
From: Karl Hobley <karl@torchbox.com>
Date: Fri, 17 Oct 2014 17:16:36 +0100
Subject: [PATCH] Use latest_revision_created_at in sitemap gen

Much faster than looking it up manually for every page in the site
---
 wagtail/wagtailcore/models.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/wagtail/wagtailcore/models.py b/wagtail/wagtailcore/models.py
index a4d0bed92..06ffb32a4 100644
--- a/wagtail/wagtailcore/models.py
+++ b/wagtail/wagtailcore/models.py
@@ -794,12 +794,10 @@ class Page(six.with_metaclass(PageBase, MP_Node, ClusterableModel, index.Indexed
         return ['/']
 
     def get_sitemap_urls(self):
-        latest_revision = self.get_latest_revision()
-
         return [
             {
                 'location': self.full_url,
-                'lastmod': latest_revision.created_at if latest_revision else None
+                'lastmod': self.latest_revision_created_at
             }
         ]