I've encountered a problem when trying to render views (there is no
problem with rendering pages), but for instance with the '+' view that
is defined in app/container/browser/configure.zcml

      menu="zmi_actions" title="Add"
      allowed_attributes="addingInfo isSingleMenuItem hasCustomAddView">

    <page name="index.html"  template="add.pt" />
    <page name="action.html" attribute="action" />


when called with:

    markup = view()

['view' being the 'view' variable gotten from ZPT)

results in the following error message:

    markup = view()
  File "/home/jmo/Zope3/src/zope/app/publisher/browser/viewmeta.py",
line 445, in __call__
    attr = self.__page_attribute__
AttributeError: '+' object has no attribute '__page_attribute__'

because the __call__ method of
zope.app.publisher.browser.viewmeta.simple expects views and pages to
have a page attribute:

    def __call__(self, *a, **k):
        # If a class doesn't provide it's own call, then get the attribute
        # given by the browser default.

        attr = self.__page_attribute__

With the '+' view described above, there is a default page attribute to
use for displaying the view ('index.html') and but no page attribute
explicitly assigned.

The following patch fixes the problem, but I'm afraid that I'm missing
something: are views supposed to have a '__page_attribute__' or not?

Index: app/publisher/browser/viewmeta.py
--- app/publisher/browser/viewmeta.py   (revision 38719)
+++ app/publisher/browser/viewmeta.py   (working copy)
@@ -275,6 +275,8 @@
             required[pname] = permission
             pages[pname] = attribute
+            if pname == 'index.html':
+                cdict['__page_attribute__'] = attribute
         # This should go away, but noone seems to remember what to do. :-(
         if hasattr(class_, 'publishTraverse'):


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