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

2006-04-20 Thread Tres Seaver 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Terry Jones wrote:
 I'd like to set up a folder in Zope with the property that when an object
 is put into it, the object has a keyword added to it automatically (and
 when the object is moved out of the folder, the keyword is removed).
 
 If you could do this, you would have a nice way to maintain a collection of
 such folders and have their contents appear elsewhere in a collection of
 Plone Smart Folders (using keyword criteria).
 
 Can anyone tell me how I should best go about doing this?
 
 I can imagine writing some python to run once in a while, find all the
 contents of the folder, add the keywords, etc. But that's far from being an
 ideal solution.
 
 Any pointers would be much appreciated.

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.
- --
===
Tres Seaver  +1 202-558-7113  [EMAIL PROTECTED]
Palladion Software   Excellence by Designhttp://palladion.com
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.1 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFER7/g+gerLs4ltQ4RAjcHAJ9WqoFcbrNIC9h3M5jYEZ8Bmq2jMQCeMjSh
7zE2AI2+rNc39s3bhOMsb4E=
=yYJw
-END PGP SIGNATURE-

___
Zope maillist  -  Zope@zope.org
http://mail.zope.org/mailman/listinfo/zope
**   No cross posts or HTML encoding!  **
(Related lists - 
 http://mail.zope.org/mailman/listinfo/zope-announce
 http://mail.zope.org/mailman/listinfo/zope-dev )

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

2006-04-20 Thread Tres Seaver 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

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.
- --
===
Tres Seaver  +1 202-558-7113  [EMAIL PROTECTED]
Palladion Software   Excellence by Designhttp://palladion.com
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.1 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFER/Iq+gerLs4ltQ4RAvSAAJ9edkh96NO63lrKF6mkuDeAGYSYWQCgp98g
hp/tu+8LtZFYjJvX3rSxuao=
=m3sh
-END PGP SIGNATURE-

-- 
===
Tres Seaver  +1 202-558-7113  [EMAIL PROTECTED]
Palladion Software   Excellence by Designhttp://palladion.com

___
Zope maillist  -  Zope@zope.org
http://mail.zope.org/mailman/listinfo/zope
**   No cross posts or HTML encoding!  **
(Related lists - 
 http://mail.zope.org/mailman/listinfo/zope-announce
 http://mail.zope.org/mailman/listinfo/zope-dev )