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Bad Zope hack (was: [Zope] A subclass from PortalMember of Membership Product and ObjectManager won't list contained objects) Membership Product and ObjectManager won't list contained objects)
by Dieter Maurer 03 Jan '01

03 Jan '01

Dirksen writes: > My site is installed with the Membership system. I want to store some photos in each > member. So I create a new member ZClass, subclassing PortalMember and ObjectManager, and > set the 'manage_main' as the main view. Under the instance of this new member ZClass, I > can add images, but I can't find them! 'objectItems' always return None. Yet the image > file is there. I can edit their properties as in > '/test/acl_users/jay/photo1/manage_main', but '/test/acl_users/jay/manage_main' just > won't show a thing! I fear this is an acquisition weakness or a bug in how it is used: I some cases, one does not want that a name is acquired. It would be nice, if there were some declaration telling the acquisition machinery about this fact. I do not know, whether there is such a mechanism. If it is, then some Zope developpers did not know about it. To prevent acquisition, many Zope objects provide new definitions for the unwanted attributes. For example, "SimpleItem.Item" defines "objectValues" (and friends) to prevent them from being acquired from the containing folder. This hack does not play well with inheritance, however! If in your case, "PortalMember" provides empty "object*" methods, the correct "ObjectManager" methods will not be found. You may try to switch the inheritance order. However, I fear, the problem is already in "ZObject", the order of which can not be changed. Hope, that in some future time, this hack disappears. Dieter

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Re: [Zope] Zope eating CPU/RAM - how do I find the culprit?
by Dieter Maurer 03 Jan '01

03 Jan '01

Cees de Groot writes: > Jon Prettyman <jprettyman(a)acm.org> said: > >If you are using ZSQLMethods and your database returns column names in > >one case (UPPER) but you reference them with another (lower) it > >appears that instances of SQLAlias get leaked. > > > Thanks for the info (and another reason to keep SQL names in lowercase ;-)). Be careful! Some databases convert them to uppercase! Oracle is a prominent example! It took me once some ours to locate a bug resulting from this "feature". Dieter

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UNEXPECTED: Acquisition.Explicit may acquire implicitly
by Dieter Maurer 03 Jan '01

03 Jan '01

While trying to understand, what the "bself= self.aq_explicit" in "OFS.DTMLMethod.__call__" should do, I detected an unexpected behaviour: usually, this "bself" acquires implicitly from its container (though not from its context) More precisely: if "bself.aq_self" is itself an implicit acquisition wrapper, the "bself.aq_explicit" acquires implicitly from "bself.aq_self.aq_parent". The following Python module demonstrates the behaviour: ------------------------------------------------------- from Acquisition import Implicit class C(Implicit): pass b= C() b.i= 0 b.d= C() b.h= C() e_bd= b.d.aq_explicit try: e_bd.i print 'e_bd implicitly acquired i' except AttributeError: pass e_bhd= b.h.d.aq_explicit try: e_bhd.i print 'e_bhd implicitly acquired i' except AttributeError: pass ------------------------------------------------------- At first, I thought this were a bug. At second thought, however, it appears to be quite natural, though unexpected: if o is self.__of__(parent), then getattr(o.aq_explicit,k) = getattr(self,k).__of__(o) If "self" is an implicit wrapper itself, then acquisition may be used to look up "k". This implies, that the idiom <dtml-if "_.hasattr(o.aq_explicit,XXXX)"> cannot be used safely to test, whether "o" has attribute XXXX itself (rather than acquired it). We probably should have a standard function for this kind of test. Dieter

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Re: [Zope] Core Session Tracking kudos & namespaces
by Bob Sidebotham 03 Jan '01

03 Jan '01

The advantage of the last form (below), is that you can use acquisition, and don't need to know whether the variable came from the session or from elsewhere. If you *really* want it to come from the session only, you can always add the "only" tag to the dtml-with call. In conjunction with this, it might be nice to have a special call that sets the variable, if defined by acquisition, in the session. Something like <dtml-call "sessionmanager.getSessionData.set('a')"> would set "a" to the acquired value for "a", leave it undefined if not defined, and not change it if it was not acquirable elsewhere (the acquired value would take precedence over the session value). Even better would be if I could just say <dtml-call "SESSION.set('a')">. Bob --- Chris McDonough <chrism(a)digicool.com> wrote: > A potential rhythm, however, might look like: > > <dtml-with sessionmanager> > <dtml-with getSessionData> > <dtml-call "set('a', 'b')"> > </dtml-with> > </dtml-with> > > and > > <dtml-with sessionmanager> > <dtml-with getSessionData> > <dtml-var a> > </dtml-with> > </dtml-with> > > I sorta like it the original way now that I've written that down. > :-) It's > easier to explain, AFAICS. > > __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/

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RE: [Zope] Advice on searching/indexing Word documents?
by Bjorn Stabell 03 Jan '01

03 Jan '01

This is something I've been longing for a long time. Wvare is cool, and it should also be able to access properties of many Windows (OLE) documents, not just Word documents. I've been thinking about extending the File class so that it becomes aware of the different file types and allows access to (read/write) meta data and indexing of the files' content. If we can setup a nice framework for it, I'm sure a lot of people could contribute code for specific file formats. Bye, -- Bjorn -----Original Message----- From: Jens Vagelpohl [mailto:jens@digicool.com] Posted At: Wednesday, January 03, 2001 11:28 Posted To: Zope List Conversation: [Zope] Advice on searching/indexing Word documents? Subject: Re: [Zope] Advice on searching/indexing Word documents? if you're on linux check out WVWare: http://www.wvware.com it's a C library that handles all word doc formats since 6.0 or so jens On Tue, 02 Jan 2001, Bowyer, Alex wrote: > Our company has a repository of staff CVs (Resumes) as Word Documents and I > am about to embark on creating a new feature for our Zope Intranet to allow > project managers to search those documents for keywords such as particular > skills or projects. > > I am thinking about several possibilities such as a skills/CVs database > linked in via ODBC, or some task that converts the Word documents to text > files which can then be searched by Zope (I think Zope can do this, and I > assume it can't search Word format directly?). > > Has anyone ever approached a similar problem, does anyone have any tips on > how to index/search a load of documents in Zope? > > Any tips/suggestions/comments would be most welcome. > > Thanks, > > Alex _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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Re: [Zope] Core Session Tracking kudos & namespaces
by Bob Sidebotham 03 Jan '01

03 Jan '01

And as I've just figured out by trying to convert some stuff to sessions, a not unconsequential result of allowing session variables to be acquired (if only for read purposes), is that existing code is easier to adapt. I might now call a script without burying form variables or parameters in the URL. If I use implicit acquisition (where the posted form data and URL data is read FIRST), then I can gracefully upgrade these scripts without changing anything. With the current scheme I have to go and search out all occurences of variables like "customer_id" and change them to session syntax. So I guess I'm arguing that the read case and write cases are fundamentally different, that you basically want to support the introduction of session variables into the namespace for read purposes through acquisition, and it's (marginally) OK if read/write don't share the same syntax. Bob Bob Sidebotham wrote: > The advantage of the last form (below), is that you can use > acquisition, and don't need to know whether the variable came from the > session or from elsewhere. If you *really* want it to come from the > session only, you can always add the "only" tag to the dtml-with call. __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/

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Re: [Zope] Advice on searching/indexing Word documents?
by Jens Vagelpohl 03 Jan '01

03 Jan '01

if you're on linux check out WVWare: http://www.wvware.com it's a C library that handles all word doc formats since 6.0 or so jens On Tue, 02 Jan 2001, Bowyer, Alex wrote: > Our company has a repository of staff CVs (Resumes) as Word Documents and I > am about to embark on creating a new feature for our Zope Intranet to allow > project managers to search those documents for keywords such as particular > skills or projects. > > I am thinking about several possibilities such as a skills/CVs database > linked in via ODBC, or some task that converts the Word documents to text > files which can then be searched by Zope (I think Zope can do this, and I > assume it can't search Word format directly?). > > Has anyone ever approached a similar problem, does anyone have any tips on > how to index/search a load of documents in Zope? > > Any tips/suggestions/comments would be most welcome. > > Thanks, > > Alex

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Advice on searching/indexing Word documents?
by Bowyer, Alex 03 Jan '01

03 Jan '01

Our company has a repository of staff CVs (Resumes) as Word Documents and I am about to embark on creating a new feature for our Zope Intranet to allow project managers to search those documents for keywords such as particular skills or projects. I am thinking about several possibilities such as a skills/CVs database linked in via ODBC, or some task that converts the Word documents to text files which can then be searched by Zope (I think Zope can do this, and I assume it can't search Word format directly?). Has anyone ever approached a similar problem, does anyone have any tips on how to index/search a load of documents in Zope? Any tips/suggestions/comments would be most welcome. Thanks, Alex ================================== Alex Bowyer IT Consultant, Logica Australasia Tel : +61 2 9202 8130 Fax : +61 2 9922 7466 E-mail : bowyera(a)logica.com WWW : http://www.logica.com.au/ ==================================

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browser window as canvas for configurable objects?
by Bob Sidebotham 03 Jan '01

03 Jan '01

I'm new to zope, so maybe these questions are naive. I have several objects that I want to display on my browser screen simultaneously. Each object lives in its own zope directory, and I can trivially include them in a bigger canvas using a table and dtml-with and dtml-var. So far so good. Each of the sub objects can put up its own links for configuration, etc. Some of the sub objects might be pageable (e.g. have links to next 10 items, previous 10), or they might be configurable (you could go to a screen to establish filtering parameters for that object). What I'm looking for is the simplest possible effective way to manage these links so that after the customization operation or the next page oeration, or whatever is handled, the original page is displayed (and of course any affected objects are updated). In some cases there may be a side-excursion made before the page is re-displayed (e.g. for "next 10 items", there is no side excursion), for "update filtering parameters" or update object, a separate form will be brought up). I should mention that the same objects may appear in the same or different forms on different pages, i.e. there isn't just one main page. Some alternatives I can see are: 1. Use javascript, and do a history.go(-1) or -2, as the case may be to go back to the original page. Disadvantage: requires an extra round-trip, probably would have to make sure page wasn't cached, may break user's model of how navigation works (if he made a mistake in the configuration, he'd have to go forward, rather than backward, to retrieve the configuration form, for example). 2. Use a pop-up window. Redraw the original when done. Advantage: by labelling the main window "main" or whatever, it's easy for unrelated objects to "return" to the main application by (1) causing "main" to reload and (2) deleting their own window. 3. Use frames. Seems overly complex. But maybe this is just a general aversion to hacking to much html. 4. Use existing zope infrastructure to finesse this. I'm not sure how to do this--my main confusion centers around how much state to I have to preserve (and where?) to re-create exactly the same request that I had at a previous level--in a totally generic fashion. 5. Build some sort of Product that represents this model directly. This seems the most promising, if not the easiest. Can someone point me to any prior art on this, or offer any suggestions? It seems to me that since zope is supposed to be about "object publishing", then this application should (ideally) be dead-easy. But at the moment I'm scratching my head. Any help would be greatly appreciated. Thanks! P.S. Does anyone else think this facility would be useful? Bob Sidebotham bob_sidebotham(a)yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/

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RE: [Zope] Advice on searching/indexing Word documents?
by sean.upton＠uniontrib.com 03 Jan '01

03 Jan '01

Cool. I'll have to take a look at this. Does anyone know if there is any effort aimed at writing document filters for use with Zope? A lot of commercial products used for knowledge management (like NextPage LivePublish, some Intranet search engines, etc) already have features like this, and I would think that a project for document filters would be a good idea, if something like this doesn't already exist. Possible things that could be filtered for input: - The IPTC header data from a JPG/TIF image - comtains a few things like the caption (the same one that you can edit in photoshop) - This would be a good addition to various Image classes. - Office documents (word, excel, powerpoint, wordperfect, staroffice, etc) - PDF and Postscript documents - Illustration files (Illustrator, CorelDraw) The value of such filters to Zope for use in knowledge-management and digital asset management would be great; I'm wondering if anyone is working on anything like this? Sean -----Original Message----- From: Jonothan Farr [mailto:jfarr@real.com] Sent: Tuesday, January 02, 2001 4:22 PM To: sean.upton(a)uniontrib.com; zope(a)zope.org Subject: Re: [Zope] Advice on searching/indexing Word documents? >I used to > write text filters in C and Lex for my previous employer - one of these days > I will figure out how to extend python with C and do this. Here's one that's written entirely in Python: http://www.cosc.canterbury.ac.nz/~greg/python/Plex/ I've seen a couple of other implementations out there. --jfarr

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