Fix persistent AccessRule instances. (#330)

Fixes #321.
zopefoundation · Oct 11, 2018 · 616c169 · 616c169
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -84,6 +84,10 @@ Bugfixes
   to interact well with plone.testing's patching of the global site manager.
   (`#361 <https://github.com/zopefoundation/Zope/pull/361>`_)
 
+- Add a backwards compatible shim for ``AccessRule`` which was removed in 4.0a1
+  but can exist in legacy databases.
+  (`#321 <https://github.com/zopefoundation/Zope/issue/321>`_)
+
 
 4.0b5 (2018-05-18)
 ------------------

diff --git a/src/Products/SiteAccess/AccessRule.py b/src/Products/SiteAccess/AccessRule.py
@@ -0,0 +1,2 @@
+# BBB
+from ZPublisher.BeforeTraverse import NameCaller as AccessRule  # noqa: F401