[Zope-dev] Defining permissions in inherited classes

[Itai Tavor]

>  > I've been stuck with this problems for weeks... I posted an earlier
>  > question bug got no replies, so I thought I'd try again.
>  >
>  > I have a product that is used as a mix-in class in several other
>  > products. This product adds a management interface screen and I want
>  > to define permissions to control that screen in this class. So, I do:
>  >
>  > class Publisher(RoleManager):
>  >
>  >      __ac_permissions__ = (
>  >          ('Change publishing', ('manage_publish'))
>  >      )
>  >
>  >      manage_publish = HTMLFile('publish', globals())
>  >
>  > In the product that uses this class:
>  >
>  > class Something(Folder, Publisher.Publisher):
>  >
>  >      __ac_permissions__ = (
>  >          ('View management screens', ('manage_tabs',
>  > 'manage_main', ....))
>  >         .....
>  >      )
>  >
>  >      manage_options = (
>  >          {'label':'Edit', 'action':'manage_main'},
>  >          {'label':'Publish', 'action':'manage_publish'}
>  >      )
>  >
>  > Now, I think this should work... that's how it's done in
>  > AccessRole.Role.RoleManager - it defines __ac_permissions__ that get
>  > added to the classes that inherit from it. But it doesn't work for
>  > me... the permissions defined in Publisher don't appear anywhere. Any
>  > idea why, or what I'm doing wrong?
>
>There is a little bit of non-obvious initialization work that
>needs to be done to gather the permission information from all
>the subclasses of an object. This is done by calling the method
>default__class_init__ (found in the Globals module), passing the
>class that represents the creatable object. The default__class_init__
>method does the correct permission initialization for you. *Note
>that you must do this for the class of each creatable object your
>product defines. In your case, you would add to the bottom of your
>module:
>
>import Globals
>
># pass the class of the creatable object
># that we are defining so that permissions
># are gathered up automatically from the
># base classes
>Globals.default__class_init__(Something)
>
>
>Hope this helps!

Thanks... and 3 cheers for the power of inside information!

Sadly, it doesn't work. I added default__class_init__ to all my 
products and the inherited permissions still don't show up. I 
inserted 'print self.meta_Type' into default__class_init__, and it 
looks like it gets called for all my classes even when I do not 
explicitly include that call, when I do include it 
default__class_init__ gets called twice for every class.

Can you think of anything that would prevent the inherited 
permissions from being included?

--
Itai Tavor                      -- "Je sautille, donc je suis."    --
itavor@vic.bigpond.net.au       --               - Kermit the Frog --
-- "What he needs now is understanding... and a confederate victory" --
-- Dr. Jacobi, Twin Peaks         --