[Grok-dev] How to create an interface providing another interface

[simon.elbaz at free.fr]

Hi,
I try to create an interface providing another interface. It seems that this is possible in Zope3 by using the component.interface.provideInterface() function.
With grok, the following code triggers an error:

---
Code:
################################

class IAMenuItem(interfaces.IInterface):
        pass

class AMenuItem(interface.Interface):
        pass

component.interface.provideInterface('menuitem', AMenuItem, IAMenuItem)
component.interface.provideInterface('menuitem', AMenuItem, IMenuItemType)

################################

Error:
....
  File "/usr/local/lib/python2.4/copy_reg.py", line 48, in _reconstructor
    obj = object.__new__(cls)
TypeError: ('object.__new__(X): X is not a type object (InterfaceClass)', <function _reconstructor at 0xb7cc0f44>, (<InterfaceClass menutest.cdcmenu.AMenuItem>, <type 'object'>, None))

--
Even if the interface is implemented by a model:

class OtherMenuItem(grok.Model):
        grok.implements(AMenuItem)

The same error is triggered.

Thanks for your help
Simon Elbaz