On 7/14/06, Chris S <[EMAIL PROTECTED]> wrote:
I'm trying to detect a disparity between an instance __version__ and a class __version__, signifying a class upgrade. However, I'm not sure why the following code doesn't work.class Foo(Persistent): __version__ = 1.0 def __setstate__(self, state): Persistent.__setstate__( self, state ) print self.__version__, type(self).__version__ if self.__version__ != type(self).__version__: print 'upgrading' self.__version__ = type(self).__version__ If I persist an instance of foo, close the db, change the class version, open my db then reload my instance, the version numbers are always equal and it never detects an upgrade. Why isn't ZODB saving the instance's __version__ attribute? Shouldn't the last line save __version__ in the instance's __dict__, which should then be different from the __class__.__version__? Chris
Nevermind, I just realized I have to do self.__version__ = self.__version__ at the beginning of __setstate__ or else the instance never stores a local __version__, causing __class__.__version__ to be used instead. Chris _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
