Moved django.db.migrations.writer.SettingsReference to django.conf.

Reduces the possibility of circular imports.

1 files changed, 12 insertions, 0 deletions

diff --git a/django/conf/__init__.py b/django/conf/__init__.py
index 73d943d26e..cf91ce83d4 100644
--- a/django/conf/__init__.py
+++ b/django/conf/__init__.py
@@ -30,6 +30,18 @@ FILE_CHARSET_DEPRECATED_MSG = (
 )
 
 
+class SettingsReference(str):
+    """
+    String subclass which references a current settings value. It's treated as
+    the value in memory but serializes to a settings.NAME attribute reference.
+    """
+    def __new__(self, value, setting_name):
+        return str.__new__(self, value)
+
+    def __init__(self, value, setting_name):
+        self.setting_name = setting_name
+
+
 class LazySettings(LazyObject):
     """
     A lazy proxy for either global Django settings or a custom settings object.