Fixed #4041 -- Added a __contains__ method to cache backends. Thanks, Gary

Wilson and SmileyChris.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@5171 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/cache/backends/base.py

@@ -54,3 +54,6 @@ class BaseCache(object):
         Returns True if the key is in the cache and has not expired.
         """
         return self.get(key) is not None
+
+    __contains__ = has_key
+

tests/regressiontests/cache/tests.py

@@ -46,6 +46,11 @@ class Cache(unittest.TestCase):
         self.assertEqual(cache.has_key("hello"), True)
         self.assertEqual(cache.has_key("goodbye"), False)
 
+    def test_in(self): 
+        cache.set("hello", "goodbye") 
+        self.assertEqual("hello" in cache, True) 
+        self.assertEqual("goodbye" in cache, False) 
+
     def test_data_types(self):
         # test data types
         stuff = {