Added config option to specify the cache to use (#270)

Author: myheroyuki

docs/installation.rst

@@ -72,6 +72,9 @@ Also, take some time to look at provided settings if you want to customize the p
             # Use this to disable caching of preference. This can be useful to debug things
             'ENABLE_CACHE': True,
 
+            # Use this to select which chache should be used to cache preferences. Defaults to default.
+            'CACHE_NAME': 'default',
+
             # Use this to disable checking preferences names. This can be useful to debug things
             'VALIDATE_NAMES': True,
         }

dynamic_preferences/managers.py

@@ -27,7 +27,7 @@ def queryset(self):
     @property
     def cache(self):
         from django.core.cache import caches
-        return caches['default']
+        return caches[preferences_settings.CACHE_NAME]
 
     def __getitem__(self, key):
         return self.get(key)

dynamic_preferences/settings.py

@@ -22,6 +22,7 @@
     'ENABLE_GLOBAL_MODEL_AUTO_REGISTRATION': True,
     'ENABLE_USER_PREFERENCES': True,
     'ENABLE_CACHE': True,
+    'CACHE_NAME': 'default',
     'VALIDATE_NAMES': True,
     'FILE_PREFERENCE_UPLOAD_DIR': 'dynamic_preferences',
     # this will be used to cache empty values, since some cache backends