[ZODB-Dev] problem with broken

[Laurence Rowe]

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).

Laurence



Adam GROSZER wrote:
> Hello,
> 
> I'm having a problem with broken objects here.
> It's coming when I'm trying to evolve generations and the generation
> just touches all objects in the ZODB to store them again with the
> non-deprecated classes.
> 
> The code is like this:
>     storage = context.connection._storage
> 
>     next_oid = None
>     n = 0
>     while True:
>         oid, tid, data, next_oid = storage.record_iternext(next_oid)
> 
>         obj = context.connection.get(oid)
>         # Make sure that we tell all objects that they have been changed. Who
>         # cares whether it is true! :-)
>         obj._p_activate()
>         obj._p_changed = True
>         
>         if next_oid is None:
>             break
> 
> 
> 2008-11-04T19:40:16 ERROR SiteError http://localhost:8080/++etc++process/@@generations.html
> Traceback (most recent call last):
>   File "F:\W\Zope3\src\zope\publisher\publish.py", line 133, in publish
>     result = publication.callObject(request, obj)
> ...
>   File "F:\W\Zope3\src\zope\tal\talinterpreter.py", line 343, in interpret
>     handlers[opcode](self, args)
>   File "F:\W\Zope3\src\zope\tal\talinterpreter.py", line 583, in do_setLocal_tal
>     self.engine.setLocal(name, self.engine.evaluateValue(expr))
>   File "F:\W\Zope3\src\zope\tales\tales.py", line 696, in evaluate
>     return expression(self)
>   File "F:\W\Zope3\src\zope\tales\expressions.py", line 217, in __call__
>     return self._eval(econtext)
>   File "F:\W\Zope3\src\zope\tales\expressions.py", line 211, in _eval
>     return ob()
>   File "F:\W\Zope3\src\zope\app\generations\browser\managers.py", line 182, in evolve
>     transaction.commit()
>   File "F:\W\Zope3\src\transaction\_manager.py", line 93, in commit
>     return self.get().commit()
>   File "F:\W\Zope3\src\transaction\_transaction.py", line 322, in commit
>     self._commitResources()
>   File "F:\W\Zope3\src\transaction\_transaction.py", line 416, in _commitResources
>     rm.commit(self)
>   File "F:\W\Zope3\src\ZODB\Connection.py", line 541, in commit
>     self._commit(transaction)
>   File "F:\W\Zope3\src\ZODB\Connection.py", line 586, in _commit
>     self._store_objects(ObjectWriter(obj), transaction)
>   File "F:\W\Zope3\src\ZODB\Connection.py", line 620, in _store_objects
>     p = writer.serialize(obj)  # This calls __getstate__ of obj
>   File "F:\W\Zope3\src\ZODB\serialize.py", line 405, in serialize
>     meta = klass, newargs()
>   File "F:\W\Zope3\src\ZODB\broken.py", line 325, in __getnewargs__
>     return self.__Broken_newargs__
> AttributeError: 'VocabularyManager' object has no attribute '__Broken_newargs__'
> 
>