Tests passing

celery/canvas.py

@@ -65,7 +65,7 @@ class _getitem_property(object):
         self.path = path.split('.') if path else None
 
     def _path(self, obj):
-        return (reduce(lambda d, k: d[k], obj, self.path) if self.path
+        return (reduce(lambda d, k: d[k], [obj] + self.path) if self.path
                 else obj)
 
     def __get__(self, obj, type=None):