thanks Chris!
-w
Chris Withers wrote:
Hi All,
Just been playing with this and found it remarkably easy, so thought I'd
pass it on. If anyone can think of a better place than the mailing list
archives for this, please let me know!
Anyway, so I'm building a Zope 2 app where I need to index objects that
are not catalog aware when they're added, modified or removed. To make
things harder, this also needs to work via WebDAV.
OK, so here's the solution:
1. Create yourself a python module called subscribers.py and put it on
your python path, containing the following:
from Acquisition import aq_base
from zope.interface import Interface
class ICatalogAware(Interface): pass
def catalog(object,event):
if aq_base(object) is object:
# ObjectModified can get emitted during creation,
# before the object has any acquisition context
return
object.getPhysicalRoot().unrestrictedTraverse(
'/catalog'
).catalog_object(object)
def uncatalog(object,event):
object.getPhysicalRoot().unrestrictedTraverse(
'/catalog'
).uncatalog_object('/'.join(object.getPhysicalPath()))
2. Slap the ICatalogAware marker interface on any classes you want to
have indexed. Here's an example for the good old File object. Put the
following in your site.zcml:
<class class="OFS.Image.File">
<implements interface="subscribers.ICatalogAware"/>
</class>
3. Finally, wire up the events so that files get indexed when they're
created, modified or removed, again by adding the following to site.zcml:
<subscriber
handler="subscribers.catalog"
for="ICatalogAware
zope.app.container.contained.ObjectAddedEvent"
/>
<subscriber
handler="subscribers.catalog"
for="ICatalogAware
zope.app.container.contained.ObjectModifiedEvent"
/>
<subscriber
handler="subscribers.uncatalog"
for="ICatalogAware
zope.app.container.contained.ObjectRemovedEvent"
/>
4. Okay, sadly you do need to get do some patching if you want changes
to the file to result in recataloging :-/ Here's a diff:
--- Image.py.original 2006-09-26 16:32:20.759375000 +0100
+++ Image.py 2006-09-26 16:33:11.384375000 +0100
@@ -33,6 +33,8 @@
from ZPublisher.HTTPRequest import FileUpload
from ZPublisher.Iterators import filestream_iterator
from zExceptions import Redirect
+from zope.event import notify
+from zope.app.container.contained import ObjectModifiedEvent
from cgi import escape
import transaction
@@ -437,6 +439,7 @@
self.ZCacheable_invalidate()
self.ZCacheable_set(None)
self.http__refreshEtag()
+ notify(ObjectModifiedEvent(self))
def manage_edit(self, title, content_type, precondition='',
filedata=None, REQUEST=None):
Okay, well, hope this helps someone :-)
Chris
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