TaskQuerySet: Always require backend set properly

diff --git a/tasklib/task.py b/tasklib/task.py
index b9cc44771c97c2eb484b429e044fbba13673f6bc..c821fcccb06e33129f5fca16fd6ce2b2f7ce6d0b 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -425,7 +425,7 @@ class TaskQuerySet(object):
     Represents a lazy lookup for a task objects.
     """
 
-    def __init__(self, backend=None, filter_obj=None):
+    def __init__(self, backend, filter_obj=None):
         self.backend = backend
         self._result_cache = None
         self.filter_obj = filter_obj or self.backend.filter_class(backend)
@@ -434,7 +434,7 @@ class TaskQuerySet(object):
         """
         Deep copy of a QuerySet doesn't populate the cache
         """
-        obj = self.__class__()
+        obj = self.__class__(backend=self.backend)
         for k, v in self.__dict__.items():
             if k in ('_iter', '_result_cache'):
                 obj.__dict__[k] = None