[Zope3-Users] adding indexes in a __init__ method

[Lorenzo Gil Sanchez]

No worries, in fact I actually tried the same aproach and hit the same
problem

Thanks anyway

Lorenzo

El mar, 25-07-2006 a las 22:16 +1200, Darryl Cousins escribió:
> Hi again,
> 
> I was a too hasty. Because it is the FieldIndex that is missing the
> _p_oid attribute, and the fix I offered is for the container. Sorry
> about that.
> 
> I need more thinking.
> 
> Regards,
> Darryl
> 
> 
> On Tue, 2006-07-25 at 22:10 +1200, Darryl Cousins wrote:
> > Hi Lorenzo,
> > 
> > The key reference adapter can only get a key reference **after** the
> > object is added to the database (because it uses _p_oid).
> > 
> > The problem could be fixed with a subscriber to IObjectAddedEvent::
> > 
> >   def FilterableContainerInitializationHandler(object, event):
> >       """Initialize container after its ObjectAddedEvent."""
> > 
> > 	# I have checks here too (maybe unecessary)
> > 	if not IObjectAddedEvent.providedBy(event):
> > 		return
> > 	if not IFilterableContainer.providedBy(object):
> > 		return
> >       	# whatever needs to be done
> > 	# self._catalog ...
> > 
> > This handler is configured::
> > 
> >   <!-- initialization handler -->
> >   <subscriber
> >     for=".IFilterableContainer
> >          zope.app.container.interfaces.IObjectAddedEvent"
> >     handler=".subscribers.FilterableContainerInitializationHandler"
> >     />
> > 
> > Hope that helps.
> > 
> > Best regards,
> > Darryl
> > 
> > On Tue, 2006-07-25 at 11:26 +0200, Lorenzo Gil Sanchez wrote:
> > > Hi,
> > > 
> > > I have a special Folder content. When an instance of this class is
> > > created I want to create a catalog and an index in its __init__ method.
> > > Something like:
> > > 
> > > class FilterableContainer(BTreeContainer):
> > > 
> > >     implements(IFilterableContainer)
> > > 
> > >     def __init__(self):
> > >         super(FilterableContainer, self).__init__()
> > >         self._catalog = LocalCatalog()
> > >         self._catalog['attr1'] = FieldIndex(field_name='attr1')
> > > 
> > > where LocalCatalog is a subclass of Catalog that only indexes objects
> > > that belong to its parent.
> > > 
> > > The problem arises when I add my FieldIndex to my internal catalog. Some
> > > events are triggered and at the end I got this exception:
> > > 
> > >   File "/opt/Zope-3.2.1/lib/python/zope/app/keyreference/persistent.py",
> > > line 41, in __init__
> > >     raise zope.app.keyreference.interfaces.NotYet(object)
> > > NotYet: <zope.app.catalog.field.FieldIndex object at 0x2aaab3609b90>
> > > 
> > > 
> > > It happens because the key reference adaptor to Persistent thinks my
> > > FieldIndex object is already stored in the database, which is not the
> > > case.
> > > 
> > > Anybody knows how should I add an index to my catalog in the __init__
> > > method?
> > > 
> > > Thanks in advance
> > > 
> > > Lorenzo
> > > 
> > > _______________________________________________
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> > > Zope3-users at zope.org
> > > http://mail.zope.org/mailman/listinfo/zope3-users
> > 
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