[ZODB-Dev] problem with broken

[Christian Theune]

On Wed, 2008-11-05 at 16:00 +0200, Marius Gedminas wrote:
> On Wed, Nov 05, 2008 at 11:48:35AM +0100, Christian Theune wrote:
> > On Wed, 2008-11-05 at 11:31 +0100, Laurence Rowe wrote:
> > > Broken objects occur when the class for a pickled object cannot be 
> > > imported. To change the location of a class, you need to provide an 
> > > alias at the old location so that the object can be unpickled, i.e. 
> > > MyOldClassName = MyNewClassName. You can only remove MyOldClassName 
> > > after you have updated all of the pickles (with your code below).
> > 
> > Note: We made a relatively good experience by removing those symbols
> > from their original modules and provide a generation which first sets up
> > dummies, then runs migration code to remove/rebase those objects and
> > then remove the dummies again.
> 
> How do you do that?  Monkey-patching?

Yes. Monkey-patching *and* monkey-unpatching.

-- 
Christian Theune · ct at gocept.com
gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany
http://gocept.com · tel +49 345 1229889 7 · fax +49 345 1229889 1
Zope and Plone consulting and development
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