On Thu, 29 Jun 2000, Steve Alexander wrote:
Hi folks,
Is there any way of interacting with the ZODB persistence machinery to add the default attribute to all instances as they are brought out of persistent storage -- so that I can just restart Zope, and have all of my instances updated as I use them ?
In addition to the method Bryan detailed, you should look into the __setstate__() method.
"When an object is activated by the object database and brought into memory, it's __setstate__() method is called. A Persistent class can override this method to initialize the object every time it is brought into memory. __setstate__() is also useful to upgrade an object from one version to another. If you add instance attributes to your product, older versions of the instances of that product will not have the new attribute. __setstate__ can check for the existance of new attributes, and create them with sane defaults in older versions of the instance."
Thanks for any help.
Hope this helps. --Jeff --- Jeff K. Hoffman 704.849.0731 x108 Chief Technology Officer mailto:jeff.hoffman@goingv.com Going Virtual, L.L.C. http://www.goingv.com/