[Zope3-Users] updating objects in ZODB

[Lorenzo Gil Sanchez]

Thierry FLORAC wrote:
> On Fri, 2006-02-10 at 11:15 +0100, Lorenzo Gil Sanchez wrote:
>> How do I update the old objects and add the new attribute to them? I can 
>> provide a default value for this attribute if that helps.
>> I know this is a common issue with application updates. I also know that 
>> during the development phase the best thing I can do is remove the 
>> Data.fs file and start again and that's what I'm currently doing. But 
>> I'm worried about installing the application in the client machines and 
>> two month later needing to add more fields to my content-types. If I 
>> understand correctly one of the advantages of Zope3 is the support for 
>> always-changing-applications. So how does it work in this particular 
>> situation?
> 
> I think that Zope3 handles this problem through the concept of 
> "generations".
> Documentation and interfaces are available in package 
> "zope.app.generations".
> 

Thanks for the pointer, that was exactly what I was looking for

>   Thierry
>