From c5bdfab9ae17953645812dc1ffc7f0b50354b7c5 Mon Sep 17 00:00:00 2001
From: Malcolm Tredinnick <malcolm.tredinnick@gmail.com>
Date: Thu, 8 Jan 2009 05:49:03 +0000
Subject: [PATCH] Fixed #9985 -- qs.values_list(...).values(...) was
 constructing incorrect SQL.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9717 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/db/models/query.py               | 6 +++++-
 django/db/models/sql/query.py           | 9 +++++++++
 tests/regressiontests/queries/models.py | 6 ++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/django/db/models/query.py b/django/db/models/query.py
index 563b902bb5..e2dcb1fa65 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -680,6 +680,7 @@ class ValuesQuerySet(QuerySet):
         Called by the _clone() method after initializing the rest of the
         instance.
         """
+        self.query.clear_select_fields()
         self.extra_names = []
         if self._fields:
             if not self.query.extra_select:
@@ -704,7 +705,10 @@ class ValuesQuerySet(QuerySet):
         Cloning a ValuesQuerySet preserves the current fields.
         """
         c = super(ValuesQuerySet, self)._clone(klass, **kwargs)
-        c._fields = self._fields[:]
+        if not hasattr(c, '_fields'):
+            # Only clone self._fields if _fields wasn't passed into the cloning
+            # call directly.
+            c._fields = self._fields[:]
         c.field_names = self.field_names
         c.extra_names = self.extra_names
         if setup and hasattr(c, '_setup_query'):
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index 876099cb1f..b12912461f 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -1538,6 +1538,15 @@ class BaseQuery(object):
         """
         return not (self.low_mark or self.high_mark)
 
+    def clear_select_fields(self):
+        """
+        Clears the list of fields to select (but not extra_select columns).
+        Some queryset types completely replace any existing list of select
+        columns.
+        """
+        self.select = []
+        self.select_fields = []
+
     def add_fields(self, field_names, allow_m2m=True):
         """
         Adds the given (model) fields to the select set. The field names are
diff --git a/tests/regressiontests/queries/models.py b/tests/regressiontests/queries/models.py
index 05842ebe7b..b32a0c5a63 100644
--- a/tests/regressiontests/queries/models.py
+++ b/tests/regressiontests/queries/models.py
@@ -1022,6 +1022,12 @@ nothing).
 >>> print Annotation.objects.filter(notes__in=Note.objects.filter(note="xyzzy")).query
 SELECT ...
 
+Bug #9985 -- qs.values_list(...).values(...) combinations should work.
+>>> Note.objects.values_list("note", flat=True).values("id").order_by("id")
+[{'id': 1}, {'id': 2}, {'id': 3}]
+>>> Annotation.objects.filter(notes__in=Note.objects.filter(note="n1").values_list('note').values('id'))
+[<Annotation: a1>]
+
 """}
 
 # In Python 2.3 and the Python 2.6 beta releases, exceptions raised in __len__