Trevor Toenjes writes:
I redid the property sheet in an existing zClass, which affected the "views tabs". Not sure, what you mean with "view tabs"...
The old zClass objects do not show the new "view tabs" in their management view. They only show [Edit] and [Contents]. Oddly, clicking [Contents] shows the new views tabs, but they dont work...?!! I just tried it:
I added a new view in the ZClass's "Views" tab, made it the first view and looked at an old instance. As expected (and hoped for), the old instances have the new view. And the view works. Thus, I cannot reproduce your findings (ZopeCVS, Python 2.1.1, Linux2).
Why has this happened? Do I have to redo my old zClass objects, or is there a workaround? There is one issue:
If you modify the default property value in a ZClass after you modified in an instance another property governed by the same property sheet, then the new default value may not show up in this instance. The reason is simple: When the "editPropertySheetForm" is submitted, it sends values for all properties not just the modified ones. "manage_changeProperties" instantiates all these values into the instance. From then on, the default value provided by the class is no longer relevant, because the instance has its own value.
So far, zClasses seem extremely unforgiving. I have yet to successfully rebase one. You read the list (not only your own posts and replies)? This was recently discussed. It is possible (HowTo on "zope.org" and mailing list archives), although not easy.
Dieter