[1.1.X] Fixed #10130: you may now delete attributes on settings. Thanks, jcassee.

Backport of r11824.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@11825 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/functional.py

@@ -280,6 +280,13 @@ class LazyObject(object):
                 self._setup()
             setattr(self._wrapped, name, value)
 
+    def __delattr__(self, name):
+        if name == "_wrapped":
+            raise TypeError("can't delete _wrapped.")
+        if self._wrapped is None:
+            self._setup()
+        delattr(self._wrapped, name)
+
     def _setup(self):
         """
         Must be implemented by subclasses to initialise the wrapped object.

tests/regressiontests/settings/tests.py

@@ -0,0 +1,17 @@
+import unittest
+from django.conf import settings
+
+class SettingsTests(unittest.TestCase):
+
+    #
+    # Regression tests for #10130: deleting settings.
+    #
+
+    def test_settings_delete(self):
+        settings.TEST = 'test'
+        self.assertEqual('test', settings.TEST)
+        del settings.TEST
+        self.assertRaises(AttributeError, getattr, settings, 'TEST')
+
+    def test_settings_delete_wrapped(self):
+        self.assertRaises(TypeError, delattr, settings, '_wrapped')