[Zope3-Users] Re: Evolution of ZoDB after changing python modules structure (moving content classes to another module)

[Aleksander Kowalczyk]

On 6/12/07, Rupert Redington <rupert at neontribe.co.uk> wrote:
>
> Aleksander Kowalczyk wrote:
> > On 6/8/07, Alek Kowalczyk <thealx at poczta.onet.pl> wrote:
> >>
> >> Alek Kowalczyk <thealx at ...> writes:
> >>
> >> >
> >> > Hi,
> >> > I moved my content class from mypackage.mymodule.MyContentClass into
> >> > mypackage.mysubpackage.mymodule.MyContentClass.
> >> > But when started Zope and went to visit an object I have previously
> >> created (of
> >> > MyContentClass), I get:
> >> > ComponentLookupError: ((<persistent broken
> >> mypackage.mymodule.MyContentClass
> >> > instance '\x00\x00\x00\x00\x00\x00\x02q'>,
> >> > <zope.publisher.browser.BrowserRequest instance
> >>
> > I found a quite well working solution on
> >> http://mail.zope.org/pipermail/zodb-dev/2006-September/010382.html
> >> [...]
> > I shouldn't announce success too early. The solution works but only
> during
> > first Zope run (i.e just after evolving the schema).
> > Although classFactory returns proper class during evolve, the new class
> > name
> > is not saved in ZoDB, so after next unghosting object get old class
> names
> > again.
> >
> > Here is my evolve script. I really don't know what more should I do to
> make
> > Zope/ZoDB write the new class name in ZoDB. Can someone help me a bit...
> :)
> >
>
> Somebody correct me if I'm wrong
> I imagine you'd need to commit the transaction manually:
>
>
> def evolve(context):
>     #dirty hack to substitute classFactory
>     context.connection._reader._factory = convertingClassFactory
>     root = context.connection.root().get(ZopePublication.root_name, None)
>     for object in findObjectsMatching(root, lambda x: True):
>          if hasattr(object, '_p_activate'):
>             object._p_activate()
>             object._p_changed = True
>     import transaction
>     transaction.commit()
>
>
> Hope that helps,
>
> Rupert
>

Yes, I've tried this already - it doesn't work too :(
I have removed this because I believe Zope.generations do the commit for me
after calling my evolve function.


Thanks!
Alek Kowalczyk
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