Decorate manager_method with `functools.wraps` instead of these 2 lines? Note that as the code stands, the `method` argument is unused. So, I suggest:
```python
    def create_method(method):
         @functools.wraps(method)
         def manager_method(self, *args, **kwargs):
             return method(self.get_queryset(), *args, **kwargs)
         return manager_method
````
Is there an edge-case that is better served by getattr?