[Grok-dev] Add forms - one object type to multiple object types

[Kevin Teague]

grok.context() declares what interfaces the View (or AddForm) can  
adapt, so you do not have to pass it a Grok Component, instead you  
can pass it an Interface. You can say that an AddForm can be adapted  
to any object with;

from zope import interface

class AddPage(grok.AddForm):
     grok.context(interface.Interface) #base interface, applies to  
all objects

This will work fine, although technically you are stating that your  
AddForm works for anything, when it will only actually work for  
Container objects. You can specify that your AddForm works with just  
Containers by doing:

from zope.app.container.interfaces import IContainer

class AddPage(grok.AddForm):
     grok.context(IContainer) # base container interface, only  
applies to container objects