Commit d9089b12 by Bach Dániel

common: add missing check to register_operation

parent 13c9ebca
......@@ -282,6 +282,8 @@ def register_operation(op_cls, op_id=None, target_cls=None):
"in the 'target_cls' parameter to this "
assert not hasattr(target_cls, op_id), (
"target class already has an attribute with this id")
if not issubclass(target_cls, OperatedMixin):
raise TypeError("%r is not a subclass of %r" %
(target_cls.__name__, OperatedMixin.__name__))
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