[Zope3-Users] adding indexes in a __init__ method

[Darryl Cousins]

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
> > 
> > _______________________________________________
> > Zope3-users mailing list
> > Zope3-users at zope.org
> > http://mail.zope.org/mailman/listinfo/zope3-users
> 
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