[Zope] Re: Automatically adding properties (keywords) to folders

[Tres Seaver]

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Terry Jones wrote:
> Hi Tres
> 
> Thanks for your answer. Could I trouble you a little bit more please?
> 
> I don't know where I'd put these fragments (and the last one seems
> incomplete, perhaps intentionally?). I'm happy to read and code myself, so
> I don't mean to ask for much here, but I'm not sure what to do with your
> suggestion. I read version 2.6 of the zope book, and today found out
> there's a proto-version 2.7, which I'll take a look at.

Note that the "new way" stuff is only for Zope *later* than 2.8.x.
In that case, you would define the function in a module somewhere on
your $PYTHONPATH (e.g., in $INSTANCE_HOME/lib/python, or in a product)
and then register it in a ZCML file which is included from your
'site.zcml' (in $INSTANCE_HOME/etc).

> Anyway, thanks again.
> 
> Terry
> 
> | The old way to do that we be to derive your own folder class and
> | override '_setObject' / '_delObject' to add your semantics.
> | 
> | The new way (for Zope >= 2.9) would be to register a subscriber for the
> | "container" events which are published automatically.  Something like
> | (untested)::
> | 
> |   def update_keywords(event):
> |       keyword = getattr(event.newparent, 'keyword', None)
> |       event.object.keyword = None
> |       event.object.reindexObject()
> | 
> | and then in ZCML::
> | 
> |   <subscriber
> |     for="zope.app.event.objectevent.ObjectEvent"
> |     factory="Products.yourproduct.events.update_keywords"



Tres.
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Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com