From e07a457c0054fa20dcbbf5bf41bc07191bdaa895 Mon Sep 17 00:00:00 2001
From: Malcolm Tredinnick <malcolm.tredinnick@gmail.com>
Date: Mon, 28 Apr 2008 04:29:06 +0000
Subject: [PATCH] Fixed #7096 -- The simplifications in [7461] weren't
 complete. They broke multi-component exclude() calls. Fixed that.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7493 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/db/models/sql/query.py           | 17 +++++++++++------
 tests/regressiontests/queries/models.py | 19 +++++++++++++++++++
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index 59b2ebdd68..bfed984953 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -895,9 +895,15 @@ class Query(object):
         Add a single filter to the query. The 'filter_expr' is a pair:
         (filter_string, value). E.g. ('name__contains', 'fred')
 
-        If 'negate' is True, this is an exclude() filter. If 'trim' is True, we
-        automatically trim the final join group (used internally when
-        constructing nested queries).
+        If 'negate' is True, this is an exclude() filter. It's important to
+        note that this method does not negate anything in the where-clause
+        object when inserting the filter constraints. This is because negated
+        filters often require multiple calls to add_filter() and the negation
+        should only happen once. So the caller is responsible for this (the
+        caller will normally be add_q(), so that as an example).
+
+        If 'trim' is True, we automatically trim the final join group (used
+        internally when constructing nested queries).
 
         If 'can_reuse' is a set, we are processing a component of a
         multi-component filter (e.g. filter(Q1, Q2)). In this case, 'can_reuse'
@@ -1001,7 +1007,6 @@ class Query(object):
 
         self.where.add((alias, col, field, lookup_type, value), connector)
         if negate:
-            self.where.negate()
             for alias in join_list:
                 self.promote_alias(alias)
             if final > 1 and lookup_type != 'isnull':
@@ -1039,12 +1044,12 @@ class Query(object):
                 self.where.start_subtree(connector)
                 self.add_q(child, used_aliases)
                 self.where.end_subtree()
-                if q_object.negated:
-                    self.where.children[-1].negate()
             else:
                 self.add_filter(child, connector, q_object.negated,
                         can_reuse=used_aliases)
             connector = q_object.connector
+        if q_object.negated:
+            self.where.negate()
         if subtree:
             self.where.end_subtree()
 
diff --git a/tests/regressiontests/queries/models.py b/tests/regressiontests/queries/models.py
index 5529bced8b..e108c46352 100644
--- a/tests/regressiontests/queries/models.py
+++ b/tests/regressiontests/queries/models.py
@@ -658,5 +658,24 @@ Bug #7098 -- Make sure semi-deprecated ordering by related models syntax still
 works.
 >>> Item.objects.values('note__note').order_by('queries_note.note', 'id')
 [{'note__note': u'n2'}, {'note__note': u'n3'}, {'note__note': u'n3'}, {'note__note': u'n3'}]
+
+Bug #7096 -- Make sure exclude() with multiple conditions continues to work.
+>>> Tag.objects.filter(parent=t1, name='t3').order_by('name')
+[<Tag: t3>]
+>>> Tag.objects.exclude(parent=t1, name='t3').order_by('name')
+[<Tag: t1>, <Tag: t2>, <Tag: t4>, <Tag: t5>]
+>>> Item.objects.exclude(tags__name='t1', name='one').order_by('name').distinct()
+[<Item: four>, <Item: three>, <Item: two>]
+>>> Item.objects.filter(name__in=['three', 'four']).exclude(tags__name='t1').order_by('name')
+[<Item: four>, <Item: three>]
+
+More twisted cases, involving nested negations.
+>>> Item.objects.exclude(~Q(tags__name='t1', name='one'))
+[<Item: one>]
+>>> Item.objects.filter(~Q(tags__name='t1', name='one'), name='two')
+[<Item: two>]
+>>> Item.objects.exclude(~Q(tags__name='t1', name='one'), name='two')
+[<Item: four>, <Item: one>, <Item: three>]
+
 """}