From 9b52bd6575627c0a5b1bb32e2657499312489608 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Thu, 25 Oct 2018 10:02:47 -0400
Subject: [PATCH] Made DatabaseFeatures.uses_savepoints default to True.

---
 django/db/backends/base/features.py       | 2 +-
 django/db/backends/dummy/features.py      | 1 +
 django/db/backends/mysql/features.py      | 1 -
 django/db/backends/oracle/features.py     | 1 -
 django/db/backends/postgresql/features.py | 1 -
 django/db/backends/sqlite3/features.py    | 1 -
 docs/releases/2.2.txt                     | 2 ++
 7 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index f724d01894..2fcea1b864 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -26,7 +26,7 @@ class BaseDatabaseFeatures:
     can_return_id_from_insert = False
     can_return_ids_from_bulk_insert = False
     has_bulk_insert = True
-    uses_savepoints = False
+    uses_savepoints = True
     can_release_savepoints = False
 
     # If True, don't use integer foreign keys referring to, e.g., positive
diff --git a/django/db/backends/dummy/features.py b/django/db/backends/dummy/features.py
index 57a403aca7..ac91731969 100644
--- a/django/db/backends/dummy/features.py
+++ b/django/db/backends/dummy/features.py
@@ -3,3 +3,4 @@ from django.db.backends.base.features import BaseDatabaseFeatures
 
 class DummyDatabaseFeatures(BaseDatabaseFeatures):
     supports_transactions = False
+    uses_savepoints = False
diff --git a/django/db/backends/mysql/features.py b/django/db/backends/mysql/features.py
index ebfd591196..c978a942fb 100644
--- a/django/db/backends/mysql/features.py
+++ b/django/db/backends/mysql/features.py
@@ -23,7 +23,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_timezones = False
     requires_explicit_null_ordering_when_grouping = True
     allows_auto_pk_0 = False
-    uses_savepoints = True
     can_release_savepoints = True
     atomic_transactions = False
     supports_column_check_constraints = False
diff --git a/django/db/backends/oracle/features.py b/django/db/backends/oracle/features.py
index c44b5041e7..89ebbff540 100644
--- a/django/db/backends/oracle/features.py
+++ b/django/db/backends/oracle/features.py
@@ -5,7 +5,6 @@ from django.utils.functional import cached_property
 
 class DatabaseFeatures(BaseDatabaseFeatures):
     interprets_empty_strings_as_nulls = True
-    uses_savepoints = True
     has_select_for_update = True
     has_select_for_update_nowait = True
     has_select_for_update_skip_locked = True
diff --git a/django/db/backends/postgresql/features.py b/django/db/backends/postgresql/features.py
index eddca77239..148e0766ed 100644
--- a/django/db/backends/postgresql/features.py
+++ b/django/db/backends/postgresql/features.py
@@ -14,7 +14,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     has_select_for_update = True
     has_select_for_update_nowait = True
     has_select_for_update_of = True
-    uses_savepoints = True
     can_release_savepoints = True
     supports_tablespaces = True
     supports_transactions = True
diff --git a/django/db/backends/sqlite3/features.py b/django/db/backends/sqlite3/features.py
index 9918e44386..c56a393772 100644
--- a/django/db/backends/sqlite3/features.py
+++ b/django/db/backends/sqlite3/features.py
@@ -29,7 +29,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     ignores_table_name_case = True
     supports_cast_with_precision = False
     time_cast_precision = 3
-    uses_savepoints = True
     can_release_savepoints = True
 
     @cached_property
diff --git a/docs/releases/2.2.txt b/docs/releases/2.2.txt
index 4a6e74fab3..8e03f54c3e 100644
--- a/docs/releases/2.2.txt
+++ b/docs/releases/2.2.txt
@@ -283,6 +283,8 @@ Database backend API
   ``DurationField`` or set ``DatabaseFeatures.can_introspect_duration_field``
   to ``False``.
 
+* ``DatabaseFeatures.uses_savepoints`` now defaults to ``True``.
+
 :mod:`django.contrib.gis`
 -------------------------