[1.2.X] Fixed #13686 -- Ensure that memcache handling of unicode values in add() and set_many() is consistent with the handling provided by get() and set(). Thanks to nedbatchelder for the report, and to jbalogh, accuser and Jacob Burch for their work ont the patch.

Backport of r15880 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15881 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/cache/backends/memcached.py

@@ -40,8 +40,6 @@ class CacheClass(BaseCache):
         return timeout
 
     def add(self, key, value, timeout=0):
-        if isinstance(value, unicode):
-            value = value.encode('utf-8')
         return self._cache.add(smart_str(key), value, self._get_memcache_timeout(timeout))
 
     def get(self, key, default=None):
@@ -92,8 +90,6 @@ class CacheClass(BaseCache):
     def set_many(self, data, timeout=0):
         safe_data = {}
         for key, value in data.items():
-            if isinstance(value, unicode):
-                value = value.encode('utf-8')
             safe_data[smart_str(key)] = value
         self._cache.set_multi(safe_data, self._get_memcache_timeout(timeout))
 

tests/regressiontests/cache/tests.py

@@ -293,20 +293,48 @@ class BaseCacheTests(object):
             u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
             u'ascii': {u'x' : 1 }
             }
+        # Test `set`
         for (key, value) in stuff.items():
             self.cache.set(key, value)
             self.assertEqual(self.cache.get(key), value)
 
+        # Test `add`
+        for (key, value) in stuff.items():
+            self.cache.delete(key)
+            self.cache.add(key, value)
+            self.assertEqual(self.cache.get(key), value)
+
+        # Test `set_many`
+        for (key, value) in stuff.items():
+            self.cache.delete(key)
+        self.cache.set_many(stuff)
+        for (key, value) in stuff.items():
+            self.assertEqual(self.cache.get(key), value)
+
     def test_binary_string(self):
         # Binary strings should be cachable
         from zlib import compress, decompress
         value = 'value_to_be_compressed'
         compressed_value = compress(value)
+
+        # Test set
         self.cache.set('binary1', compressed_value)
         compressed_result = self.cache.get('binary1')
         self.assertEqual(compressed_value, compressed_result)
         self.assertEqual(value, decompress(compressed_result))
 
+        # Test add
+        self.cache.add('binary1-add', compressed_value)
+        compressed_result = self.cache.get('binary1-add')
+        self.assertEqual(compressed_value, compressed_result)
+        self.assertEqual(value, decompress(compressed_result))
+
+        # Test set_many
+        self.cache.set_many({'binary1-set_many': compressed_value})
+        compressed_result = self.cache.get('binary1-set_many')
+        self.assertEqual(compressed_value, compressed_result)
+        self.assertEqual(value, decompress(compressed_result))
+
     def test_set_many(self):
         # Multiple keys can be set using set_many
         self.cache.set_many({"key1": "spam", "key2": "eggs"})