[Zope3-Users] Question about "ForbiddenAttribute"...

[Thierry FLORAC]

Hi,

I'm trying to build a sample photos management application for Zope-3.2,
with the following interfaces and classes :

 - class IGalleryPhoto(IContainer)
     ...

 - class IGalleryContainer(IContainer)
     (marker interface used for preconditions)

 - class IGalleryFolder(IGalleryContainer)
     def getImages():
       ...

 - class IGallery(IGalleryFolder,IPossibleSite)
     ...

 - class GalleryPhoto(BTreeContainer)
     ...

 - class GalleryFolder(Folder)
     def getImages(self):
       return [item for item in self.values() 
                             if IGalleryPhoto.providedBy(item)]

 - class Gallery(GalleryFolder, SiteManagerContainer)
     ...

Until now, it's OK !
After that, I created a sample view based on a page template for
IGalleryFolder, using a view class :

  - <tal:x repeat="image view/getImages"> ... </tal:x>

  - class FolderInfo:
    
      def getImages(self):
        """Get a sorted list of images"""
        result = IGalleryFolder(self.context).getImages()
        result.sort (lambda x,y: cmp(IGalleryPhoto(x).name,
                                     IGalleryPhoto(y).name))
        return result

The view is registered in ZCML like this :

  <page
    name="images.html"
    for=".interfaces.IGalleryFolder"
    allowed_interface=".interfaces.IGalleryPhoto"
    template="folder_images.pt"
    permission="zope.View"
    class=".folder.FolderInfo"
    menu="zmi_views" title="Images" />

But when trying to display the view, a ForbiddenAttribute exception is
raised :
  File ".../browser/folder.py", line 39, in getImages
    result.sort (lambda x,y:
                 cmp(IGalleryPhoto(x).name,IGalleryPhoto(y).name))
  ForbiddenAttribute:('sort',[<GalleryPhoto object at 0xa5b378ac>,...] 

So the forbidden attribute seems to be the "sort" method of the
resulting array, which of course isn't part of any of my interfaces.

In such a case, I solved the problem by moving the "getSortedImages" to
the folder interface and content class.
But that may not always be possible, so how can I get access to such
methods ??

Thanks for any help,
Thierry



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