Fixed #7967 -- Make sure the __contains__ method in the cache backend…

…s call the

right has_key() method for the subclass. Patch from Marty Alchin.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8084 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/cache/backends/base.py

@@ -63,4 +63,11 @@ def has_key(self, key):
         """
         return self.get(key) is not None
 
-    __contains__ = has_key
+    def __contains__(self, key):
+        """
+        Returns True if the key is in the cache and has not expired.
+        """
+        # This is a separate method, rather than just a copy of has_key(),
+        # so that it always has the same functionality as has_key(), even
+        # if a subclass overrides it.
+        return self.has_key(key)

tests/regressiontests/cache/tests.py

@@ -56,11 +56,15 @@ def test_has_key(self):
         cache.set("hello1", "goodbye1")
         self.assertEqual(cache.has_key("hello1"), True)
         self.assertEqual(cache.has_key("goodbye1"), False)
+        cache.set("empty", 'fred')
+        self.assertEqual(cache.has_key("empty"), True)
 
     def test_in(self):
         cache.set("hello2", "goodbye2")
         self.assertEqual("hello2" in cache, True)
         self.assertEqual("goodbye2" in cache, False)
+        cache.set("empty", 'fred')
+        self.assertEqual("empty" in cache, True)
 
     def test_data_types(self):
         stuff = {