[ZODB-Dev] Reachability and GUI apps

[Rad Widmer]

Hi Christian

Thanks for the links. I took a look at Models.py and Proxies.py. I can see where you recreate the
_v_ attributes as needed, but I don't see how the proxies get re-registered with their models. I
guess this would need to occur when the model's persistent state is reloaded (the model transitions
from ghost to up-to-date state).

Cheers,

Rad Widmer

> Yes; I had a similar issue with the Kiwi Model class. The approach I
> used (which may be called somewhat canonical with the ZODB) is storing
> this data in an attribute with a name starting with _v_, which indicates
> it is "volatile" and not stored with the Persistent object's state.
>
> Interesting that your GUI classes model exactly what the Kiwi Model and
> Proxies do. Check them out if you like; there's a tutorial up at
>
>     http://www.async.com.br/projects/kiwi/howto/
>
> You can see the _v_ evil at work in Models.py:
>
>
http://cvsweb.async.com.br/index.cgi/Kiwi/Kiwi/FrameWork/Models.py?rev=1.2;content-type=text%2Fplain
>
> Take care,
> --
> Christian Robottom Reis | http://async.com.br/~kiko/ | [+55 16] 3361 2331
>
>