[Grok-dev] Re: avoiding ZODB breakage

[Philipp von Weitershausen]

Martijn Faassen wrote:
>> a) introduce a module alias (if you've moved a whole module)
>> b) or provide BBB imports in the old module
>>
>> Both aren't hard, in fact b) is pretty straight-forward. I don't think 
>> it gets any easier. You just have to *know* that you have to do it. 
>> That's really the trickiest part, I think.
> 
> The trickiest part will be easier if we make it absolutely trivial. I 
> think we should make it so the user doesn't have to care whether they 
> moved the whole module or not. I also don't want to tell people how they 
> should mess around sys.modules themselves to make module aliases (as I 
> understand a) still requires).
> 
> What about something like this?
> 
> class Foo(grok.Model):
>     grok.moved('foo.bar.baz', class_name='Bar')
> 
> so, if you move any class, you can indicate with grok.moved that you 
> moved it.

Yup, why not. Could also be a module-level directive, then it would set 
up a module alias for the whole module.