Andreas Pakulat wrote at 2003-6-5 15:28 +0200:
I've got a question regarding ZClasses and the building of Hierarchies using them.
For example I have ZClass A and the ZClasses B and C "derived" from A
What does Zope do if I create a new Instance of B using manage_addProduct['myproduct'].B_add(myparam). I know that the B_add Script I created is called, but is also the A_add Script called,
No, it is not called.
or can I call it in the B_add script,
You can, but almost surely it will not do what you expect (it probably will create a *new* "A" instance, independent from your "B" instance). , or do I have to reimplement all necessary
things from A_add in B_add?
You "A_add" probably contains 2 parts: 1. create a new "A" instance 2. initialize the new instance Factor out part 2 (in a separate script inside your product). Call it in both "A_add" and "B_add". Note that when a ZClass "B" derives from a ZClass "A", then both should be in the same product. Otherwise, the relation between the two classes is lost during export or distribution. Dieter