[Zope] Subclassing ZObjectManager in ZClasses

[Alexandre Ratti]

[Repost - previous message was truncated.]


Hello,


I've been playing with ZClasses and I ran into an issue with ZObjectManager.

Summary: (when creating a folderish ZClass and cascading base classes) if 
ZObjectManager isn't subclassed at 1st level, objects can be added to the 
folderish ZClass instances but they don't show in the manage_main object list.

[Zope 2.1.4 on Win32, pure ZClasses, no Python around]

More details:

1) I first tried this simple setup. It worked fine:

ZClass_for_CatalogAware
ZClass_for_Renderable
ZObjectManager
   |
   |_MyTestClass

MyTestClass is folderish and works as expected.


2) This setup worked fine too:

ZClass_for_CatalogAware
ZClass_for_Renderable
ZObjectManager
   |
   |_MyBaseClass
     |_MyTestClass1
     |_MyTestClass2

I can create a custom base class and use it in several ZClasses. They are 
folderish and work as expected.


3) Then I tried this setup:

ZClass_for_CatalogAware
ZClass_for_Renderable
   |
   |_MyBaseClass
   |_ZObjectManager
      |_MyTestClass

Here I first created MyBaseClass, then I subclassed it together with 
ZObjectManager when creating MyTestClass.

MyTestClass looked OK; I created a Content view linked to manage_main; I 
allowed adding standard object types such as Folder and File.

However, when I add objects in an instance of MyTestClass they do not show 
in the object list (Content view). I *think* they are actually added 
because I cannot add an additional one with the same ID: I get an "ID 
already in use" error.

When testing further I got the same results when CatalogAware and 
Renderable were not around. Same results too when subclassing Folder instead.

It's not that bad, but I can't create a standard base class, then use it to 
create a folderish variant.

Does anyone understand why?


Cheers.

Alexandre