From 4eabb2133fe55a12c9c56e766cbe3db1c25d56ab Mon Sep 17 00:00:00 2001
From: drewc <drewc@tech.coop>
Date: Thu, 16 Jun 2005 19:58:49 -0700
Subject: [PATCH] explode-foreign-key now returns an empty instance if the key
 is NIL. also, as a second value it returns the name of toe forgeign slot.

darcs-hash:20050617025849-39164-355e54ff23d6d991905567868c38e914922728d0.gz
---
 src/meta-model.lisp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/meta-model.lisp b/src/meta-model.lisp
index b0d1ff5..9ea1d3c 100644
--- a/src/meta-model.lisp
+++ b/src/meta-model.lisp
@@ -160,7 +160,9 @@
   "returns the clsql view-class joined on SLOT"
   (dolist (s (list-join-attributes model))
     (when (equal (getf (cdr s) :home-key) slot)
-      (return-from explode-foreign-key (slot-value model (car s))))))
+      (let ((val (slot-value model (car s))))
+      (return-from explode-foreign-key 
+	(values (if val val (make-instance (getf (cdr s) :join-class))) (getf (cdr s) :foreign-key)))))))
 
 (defun find-join-helper (foreign-key)
   (lambda (class slot) 
-- 
2.20.1