[ZODB-Dev] Issue trying to remove elements in OOTreeSet

[César Muñoz]

Hello Marius,

thank you so much for your quick answer! I'll give it a try implementing
these methods and will get back to you with the result.
But anyway, the Chatroom class is inheriting from Persistent, I thought this
base class provided some basic comparison methods...

2010/9/23 Marius Gedminas <marius at gedmin.as>

>
> It sounds as if your Chatroom class doesn't implement comparison
> operators (__lt__ and friends) correctly.
>
> If you want to store objects in an OOTreeSet, those objects must
> have a well-defined ordering that doesn't change when the objects are
> loaded back from the ZODB and end up at a different memory address.  The
> default comparison provided by Python doesn't cut it.
>
> So: does your Chatroom define __cmp__ or __lt__, __le__, __gt__, __ge__,
> __eq__, __ne__ methods?
>
> Marius Gedminas
> --
> Writing setattr hooks properly is a black art. Writing persistent
> setattr hooks is more like hearding bees blindfolded...
>        -- Casey Duncan
>
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-- 
César Muñoz

CERN
IT-UDS-AVC-Indico
Bd. 513, R-042
Tel.: +41 22 76 77159
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