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

[Dieter Maurer]

=?iso-8859-1?Q?Max=5FM=F8ller=5FRasmussen?= writes:
 > 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.
Your "self" is here not your Object Manager but a factory instance.
The Object Manager is in the acquisition chain of the factory
and by this way, you can usually acquire method of the Object
Manager. However, "_getNewId" begins with a "_" and such
attributes are not acquired unless explicitly requested.


Dieter