Ticket #18447: lazy_with_tests.patch

django/utils/functional.py

@@ -230 +230 @@
             self._setup()
         delattr(self._wrapped, name)
 
+    def __getitem__(self, name):
+        if self._wrapped is empty:
+            self._setup()
+        return self._wrapped[name]
+
+    def __setitem__(self, name, val):
+        if self._wrapped is empty:
+            self._setup()
+        self._wrapped[name] = val
+
     def _setup(self):
         """
         Must be implemented by subclasses to initialise the wrapped object.

tests/regressiontests/utils/simplelazyobject.py

@@ -10 +10 @@
 
 
 class _ComplexObject(object):
+
     def __init__(self, name):
         self.name = name
 
@@ -121 +122 @@
         self.assertEqual(unpickled, x)
         self.assertEqual(six.text_type(unpickled), six.text_type(x))
         self.assertEqual(unpickled.name, x.name)
+
+    def test_lazy_dict(self):
+        lazydict = SimpleLazyObject(lambda: {'one': 1, 'two': 2,
+                                             'three': 3, 'four': 4})
+        self.assertTrue(lazydict['one'])
+        lazydict['one'] = 0
+        self.assertFalse(lazydict['one'])