[1.9.x] Fixed #26092 -- Fixed QuerySet.order_by() regression with an M2M through model.

Backport of ee596888e1149864e7828f5cf63c0eda395744c3 from master

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
index 48b00461e9..22e4e884b8 100644
--- a/django/db/models/sql/compiler.py
+++ b/django/db/models/sql/compiler.py
@@ -568,7 +568,7 @@ class SQLCompiler(object):
         # If we get to this point and the field is a relation to another model,
         # append the default ordering for that model unless the attribute name
         # of the field is specified.
-        if field.is_relation and path and opts.ordering and name != field.attname:
+        if field.is_relation and opts.ordering and getattr(field, 'attname', None) != name:
             # Firstly, avoid infinite loops.
             if not already_seen:
                 already_seen = set()