[ZDP] BackTalk to Document Zope Developer's Guide (2.4 edition)/ZODB Persistent Components

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZDG/current/Persistence.stx#2-31

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    There are two solutions to this problem.  First, you can assign a
    special flag, '_p_changed'::

        def addDepartment(self, department):
            self.department.append(department)
            self._p_changed = 1

      % Anonymous User - Nov. 8, 2002 11:05 pm:
       well, these are simple types. i had a (recursive) attribute 
       self.tree = [..., {'sub': <a subtree> ...} ...] 
       and sometimes (unreproducable) it didnt update in lieu of self._p_changed=1.
       Explain.