From ec5ddbf391dca46b70cd69bd96bed23419ed3352 Mon Sep 17 00:00:00 2001
From: Ross Lawley <ross.lawley@gmail.com>
Date: Mon, 14 May 2012 12:06:25 +0100
Subject: [PATCH] Fixed sparse indexes with inheritance

fixes hmarr/mongoengine#497
---
 docs/changelog.rst      | 1 +
 mongoengine/queryset.py | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 44ae826e..0843a35c 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,6 +4,7 @@ Changelog
 
 Changes in 0.6.9
 ================
+- Fixed sparse indexes on inherited docs
 - Removed FileField auto deletion, needs more work maybe 0.7
 
 Changes in 0.6.8
diff --git a/mongoengine/queryset.py b/mongoengine/queryset.py
index 6d8cc7a5..a535553f 100644
--- a/mongoengine/queryset.py
+++ b/mongoengine/queryset.py
@@ -512,6 +512,10 @@ class QuerySet(object):
                 key = '.'.join(parts)
             index_list.append((key, direction))
 
+            # If sparse - dont include types
+            if spec.get('sparse', False):
+                use_types = False
+
             # Check if a list field is being used, don't use _types if it is
             if use_types and not all(f._index_with_types for f in fields):
                 use_types = False