Removes backend.capabilities (not used anymore)

celery/backends/base.py

@@ -20,8 +20,6 @@ class BaseBackend(object):
 
     TimeoutError = TimeoutError
 
-    capabilities = []
-
     def __init__(self, *args, **kwargs):
         pass
 
@@ -145,8 +143,6 @@ class BaseBackend(object):
 
 class BaseDictBackend(BaseBackend):
 
-    capabilities = ["ResultStore"]
-
     def __init__(self, *args, **kwargs):
         super(BaseDictBackend, self).__init__(*args, **kwargs)
         self._cache = LocalCache(limit=conf.MAX_CACHED_RESULTS)

celery/backends/mongodb.py

@@ -21,15 +21,12 @@ class Bunch:
 
 
 class MongoBackend(BaseDictBackend):
-
-    capabilities = ["ResultStore"]
-
-    mongodb_host = 'localhost'
+    mongodb_host = "localhost"
     mongodb_port = 27017
     mongodb_user = None
     mongodb_password = None
-    mongodb_database = 'celery'
-    mongodb_taskmeta_collection = 'celery_taskmeta'
+    mongodb_database = "celery"
+    mongodb_taskmeta_collection = "celery_taskmeta"
 
     def __init__(self, *args, **kwargs):
         """Initialize MongoDB backend instance.
@@ -52,15 +49,15 @@ class MongoBackend(BaseDictBackend):
                 raise ImproperlyConfigured(
                     "MongoDB backend settings should be grouped in a dict")
 
-            self.mongodb_host = config.get('host', self.mongodb_host)
-            self.mongodb_port = int(config.get('port', self.mongodb_port))
-            self.mongodb_user = config.get('user', self.mongodb_user)
+            self.mongodb_host = config.get("host", self.mongodb_host)
+            self.mongodb_port = int(config.get("port", self.mongodb_port))
+            self.mongodb_user = config.get("user", self.mongodb_user)
             self.mongodb_password = config.get(
-                    'password', self.mongodb_password)
+                    "password", self.mongodb_password)
             self.mongodb_database = config.get(
-                    'database', self.mongodb_database)
+                    "database", self.mongodb_database)
             self.mongodb_taskmeta_collection = config.get(
-                'taskmeta_collection', self.mongodb_taskmeta_collection)
+                "taskmeta_collection", self.mongodb_taskmeta_collection)
 
         super(MongoBackend, self).__init__(*args, **kwargs)
         self._connection = None