From 747471b08af07e33578ceafb88dab41f26c5a976 Mon Sep 17 00:00:00 2001
From: Lance Edgar <ledgar@sacfoodcoop.com>
Date: Wed, 13 Jan 2016 02:40:03 -0600
Subject: [PATCH] Fix auto-creation of grid sorter, when joined table is
 involved.

---
 tailbone/newgrids/alchemy.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tailbone/newgrids/alchemy.py b/tailbone/newgrids/alchemy.py
index dca0e35d..0663ec73 100644
--- a/tailbone/newgrids/alchemy.py
+++ b/tailbone/newgrids/alchemy.py
@@ -126,7 +126,8 @@ class AlchemyGrid(Grid):
         Returns a function suitable for a sort map callable, with typical logic
         built in for sorting applied to ``field``.
         """
-        column = getattr(self.model_class, model_property.key)
+        class_ = getattr(model_property, 'class_', self.model_class)
+        column = getattr(class_, model_property.key)
         return lambda q, d: q.order_by(getattr(column, d)())
 
     def load_settings(self):