From 4358dd7551b68087c2d28661570f3647f13442df Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 11 Feb 2006 15:43:52 +0000
Subject: [PATCH] put assertion in to check for secondary table if
 secondaryjoin explicit

---
 lib/sqlalchemy/mapping/properties.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/sqlalchemy/mapping/properties.py b/lib/sqlalchemy/mapping/properties.py
index 61bb3da369..01c0921b76 100644
--- a/lib/sqlalchemy/mapping/properties.py
+++ b/lib/sqlalchemy/mapping/properties.py
@@ -164,6 +164,8 @@ class PropertyLoader(MapperProperty):
         self.key = key
         self.parent = parent
 
+        if self.secondaryjoin is not None and self.secondary is None:
+            raise ValueError("Property '" + self.key + "' specified with secondary join condition but no secondary argument")
         # if join conditions were not specified, figure them out based on foreign keys
         if self.secondary is not None:
             if self.secondaryjoin is None:
-- 
2.47.2