[ZODB-Dev] Changing Baseclass

[Dieter Maurer]

Thomas Guettler wrote at 2003-11-27 13:12 +0100:
 > I changed the baseclass of an object. I added Persistent
 > to the list of baseclasses.
 > 
 > When I unpickle the object (which was stored before the
 > change) I get:
 > 
 >  __init__() takes exactly 2 arguments (1 given)
 > 
 > If I build a new application, without unpickling the
 > old objects everything works fine.
 > 
 > This time it was no problem, since was no important data
 > in the database. But it would be nice to know how to handle
 > this if the database contains important data.

As an expert, you know the importance of the traceback ;-)

-- 
Dieter