From e89fe839927aeb122e77656309ccefab7880f83b Mon Sep 17 00:00:00 2001
From: Bertrand Bordage <bordage.bertrand@gmail.com>
Date: Sun, 24 May 2015 18:28:16 +0200
Subject: [PATCH] Fixes the AttributeError happening when excluding through a
 M2M on a multi-table inheritance child model.

---
 cachalot/utils.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cachalot/utils.py b/cachalot/utils.py
index 104c65d..a0b2fd6 100644
--- a/cachalot/utils.py
+++ b/cachalot/utils.py
@@ -67,7 +67,10 @@ def _get_tables_from_sql(connection, lowercased_sql):
 def _find_subqueries(children):
     for child in children:
         if isinstance(child, SubqueryConstraint):
-            yield child.query_object.query
+            if isinstance(child.query_object, Query):
+                yield child.query_object
+            else:
+                yield child.query_object.query
         else:
             rhs = None
             if DJANGO_GTE_1_7: