[Zope] Why can't I use a method of an objectmanger I am trying to add to ?

[Max Møller Rasmussen]

I have an objectmanager that implements:

    def _getNewId(self):
        """
        generates a new unique id for a message
        get new id and make a zero-padded string
        """
        # 12 chars long, 999,999,999,999 messages max in one discussion!
        newID = '%012d' % self._newId
        self._newId += 1
        self._p_changed = 1
        return newID

And it works nicely if I call it directly.

But when I try to call the method from an object being added to the
objectmanager like this:

------------------------------------------------------

def manage_addMessageAction(self,
               title='No title',
               comment='No comment',
               author='No author',
               email='',
               parent=None,
               REQUEST=None, RESPONSE=None):
               
    "Adds a message to the objectmanager"
    
    id = self._getNewId()

    .... etc.

------------------------------------------------------

I get an error:

Error Type: AttributeError
Error Value: _getNewId

Traceback (innermost last):

  File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 223, in
publish_module

  File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 187, in
publish

  File C:\zope\zope240\lib\python\Zope\__init__.py, line 226, in
zpublisher_exception_hook

  File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 171, in
publish

  File C:\zope\zope240\lib\python\ZPublisher\mapply.py, line 160, in mapply
    (Object: manage_addMessageAction)

  File C:\zope\zope240\lib\python\ZPublisher\Publish.py, line 112, in
call_object
    (Object: manage_addMessageAction)

  File C:\zope\zope240\lib\python\Products\mxm_Discuss\mxm_Message.py, line
106, in manage_addMessageAction

AttributeError: (see above)

------------------------------------------------------

line 106 being "id = self._getNewId()"

"manage_addMessageAction" is registered as a constructor. When it is being
called from an ObjectManager, isn't the objectmanager passed to this unbound
method?

If so, why can't it find "_getNewId()"

Regards Max M