Fixed test failure caused by different NULL ordering between backends

2 files changed, 4 insertions, 0 deletions

diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index 946c650c34..07d45c9175 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -595,6 +595,9 @@ class BaseDatabaseFeatures(object):
     # to remove any ordering?
     requires_explicit_null_ordering_when_grouping = False
 
+    # Does the backend order NULL values as largest or smallest?
+    nulls_order_largest = False
+
     # Is there a 1000 item limit on query parameters?
     supports_1000_query_parameters = True
 
diff --git a/django/db/backends/postgresql_psycopg2/base.py b/django/db/backends/postgresql_psycopg2/base.py
index e676065578..f0a82c22d6 100644
--- a/django/db/backends/postgresql_psycopg2/base.py
+++ b/django/db/backends/postgresql_psycopg2/base.py
@@ -55,6 +55,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_tablespaces = True
     supports_transactions = True
     can_distinct_on_fields = True
+    nulls_order_largest = True
 
 
 class DatabaseWrapper(BaseDatabaseWrapper):