Hello Marius,<br><br>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. <br>But anyway, the Chatroom class is inheriting from Persistent, I thought this base class provided some basic comparison methods...<br>
<br><div class="gmail_quote">2010/9/23 Marius Gedminas <span dir="ltr"><<a href="mailto:marius@gedmin.as">marius@gedmin.as</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
It sounds as if your Chatroom class doesn't implement comparison<br>
operators (__lt__ and friends) correctly.<br>
<br>
If you want to store objects in an OOTreeSet, those objects must<br>
have a well-defined ordering that doesn't change when the objects are<br>
loaded back from the ZODB and end up at a different memory address. The<br>
default comparison provided by Python doesn't cut it.<br>
<br>
So: does your Chatroom define __cmp__ or __lt__, __le__, __gt__, __ge__,<br>
__eq__, __ne__ methods?<br>
<br>
Marius Gedminas<br>
<font color="#888888">--<br>
Writing setattr hooks properly is a black art. Writing persistent<br>
setattr hooks is more like hearding bees blindfolded...<br>
-- Casey Duncan<br>
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