Removed all uses of create_cache.

Refactored the cache tests significantly.

Made it safe to override the CACHES setting.

django/core/management/commands/createcachetable.py

@@ -1,7 +1,7 @@
 from optparse import make_option
 
 from django.conf import settings
-from django.core.cache import create_cache
+from django.core.cache import caches
 from django.core.cache.backends.db import BaseDatabaseCache
 from django.core.management.base import BaseCommand, CommandError
 from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
@@ -30,7 +30,7 @@ class Command(BaseCommand):
                 self.create_table(db, tablename)
         else:
             for cache_alias in settings.CACHES:
-                cache = create_cache(cache_alias)
+                cache = caches[cache_alias]
                 if isinstance(cache, BaseDatabaseCache):
                     self.create_table(db, cache._table)
 

django/middleware/cache.py

@@ -46,7 +46,7 @@ More details about how the caching works:
 import warnings
 
 from django.conf import settings
-from django.core.cache import create_cache, caches, DEFAULT_CACHE_ALIAS
+from django.core.cache import caches, DEFAULT_CACHE_ALIAS
 from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age
 
 
@@ -196,4 +196,4 @@ class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
             msg = "CACHE_MIDDLEWARE_ANONYMOUS_ONLY has been deprecated and will be removed in Django 1.8."
             warnings.warn(msg, DeprecationWarning, stacklevel=1)
 
-        self.cache = create_cache(self.cache_alias)
+        self.cache = caches[self.cache_alias]

django/test/signals.py

@@ -1,5 +1,6 @@
 import os
 import time
+import threading
 import warnings
 
 from django.conf import settings
@@ -19,6 +20,13 @@ setting_changed = Signal(providing_args=["setting", "value", "enter"])
 COMPLEX_OVERRIDE_SETTINGS = set(['DATABASES'])
 
 
+@receiver(setting_changed)
+def clear_cache_handlers(**kwargs):
+    if kwargs['setting'] == 'CACHES':
+        from django.core.cache import caches
+        caches._caches = threading.local()
+
+
 @receiver(setting_changed)
 def update_connections_time_zone(**kwargs):
     if kwargs['setting'] == 'TIME_ZONE':