From 6baded55b00e883c2612c013b884e8135baeaebe Mon Sep 17 00:00:00 2001
From: jlaine <jlaine@e071eeec-0327-468d-9b6a-08194a12b294>
Date: Mon, 24 May 2010 09:55:21 +0000
Subject: [PATCH] allow order_by using a '-' prefix

git-svn-id: https://svn.bolloretelecom.eu/opensource/django-ldapdb/trunk@869 e071eeec-0327-468d-9b6a-08194a12b294
---
 ldapdb/models/query.py | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/ldapdb/models/query.py b/ldapdb/models/query.py
index 020d4ee..b35c123 100644
--- a/ldapdb/models/query.py
+++ b/ldapdb/models/query.py
@@ -139,13 +139,21 @@ class Query(BaseQuery):
             ordering = self.order_by
         else:
             ordering = self.order_by or self.model._meta.ordering
-        def getkey(x):
-            keys = []
-            for k in ordering:
-                attr = self.model._meta.get_field(k).db_column
-                keys.append(x[1].get(attr, '').lower())
-            return keys
-        vals = sorted(vals, key=lambda x: getkey(x))
+        def cmpvals(x, y):
+            for field in ordering:
+                if field.startswith('-'):
+                    field = field[1:]
+                    negate = True
+                else:
+                    negate = False
+                attr = self.model._meta.get_field(field).db_column
+                attr_x = x[1].get(attr, '').lower()
+                attr_y = y[1].get(attr, '').lower()
+                val = negate and cmp(attr_y, attr_x) or cmp(attr_x, attr_y)
+                if val:
+                    return val
+            return 0
+        vals = sorted(vals, cmp=cmpvals)
 
         # process results
         for dn, attrs in vals:
-- 
2.30.2