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multi-level acquisition (or the "images" folder problem)
by Tim Moore 26 Jun '01

26 Jun '01

OK, a lot of people have run into this class of problems before, but I haven't seen a general solution yet, so I thought I'd offer one. But first, let me explain the problem for those who haven't had it yet :-) OK, so as an example say we have a site set up like this: / | +-/images | | | +-img1 | +-/index_html | +-/folder | +-/index_html Both index_html methods contain something like <dtml-var "images.img1"> ...if you're familiar with how acquisition works, then you'll know that everything is OK...the images folder will be acquired from the root folder, and img1 is contained therein. OK, now say we want to add some images specific to the contents of folder. We can create an images subfolder, and put a new image in there: / | +-/images | | | +-img1 | +-/index_html | +-/folder | +-/images | | | +-img2 | +-/index_html ...and edit the tag in /folder/index_html to say <dtml-var "images.img2"> So far, still good. But now lets say that we want /folder/index_html to use both /images/img1 and /folder/images/img2... <dtml-var "images.img1"> <dtml-var "images.img2"> The first statement fails. This is an important subtlety about acquisition: once it finds an element of the path, it only searches within that for the rest of the path...so the first statement is looking for img1 in /folder/images. This trips up a lot of people who would expect Zope to keep searching up the path for other "images" folders until the full path is found (or until it reaches the root folder in the case that the path isn't present at all). There are a number of workarounds to this, but mostly they involve explicitly naming paths and avoiding acquisition entirely, which isn't always what you want. So I threw together a simple python script that I put in my root folder called "find" which takes a path (as a python sequence of names), starts at the current context, and moves up the acquisition chain looking for the specified path. So you'd replace the above with: <dtml-var "find(['images', 'img1'])"> <dtml-var "find(['images', 'img2'])"> ...and it would all work just fine. Best of all, you could later add an img1 to /folder/images to replace the default one in /images for everything under /folder, just as one might expect. It seems to work fine OMM, but hasn't been tested extensively, so use at your own risk :-) Also note that if the specified path doesn't exist at all anywhere in the acquisition chain, you'll get an error. Hope this helps some people out there! ## Script (Python) "find" ##bind container=container ##bind context=context ##bind namespace= ##bind script=script ##bind subpath=traverse_subpath ##parameters=path ##title= ## searchPoint = context target = None while searchPoint and not target: target = searchPoint.restrictedTraverse(path) if not target: searchPoint = searchPoint.aq_parent return target -- Tim Moore

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[Zope]: manage_edit with DTML method
by Arno Gross 26 Jun '01

26 Jun '01

I have two DTML methods and I want to do sth like this: <dtml-call "manage_edit(data=result_of_other_DMLTmethod, title='myTitle')"> But how can I force that the rendered result is inserted and not the document source. Best regards Arno

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ALIAS
by Martin Stötzel 26 Jun '01

26 Jun '01

Cellion BriefpapierBuenas dias, this is my second question: How can I set an Alias to a zope folder? I want for example www.myhomepage.com redirect (or function as alias) for my Zope folder "home" which is in the root. Actually I can only redriect to my ROOT folder - and have to use www.myhomepage.com/home in order to get to my homepage. The reason is that people delivering content should not be able to see and change Zope Management themes (ACL users etc.) Greetings, Martin

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DTML-sqltest question
by Stanislav Marszalek 26 Jun '01

26 Jun '01

Hello, I want to use <dtml-sqltest > tag in ZSQL Method. I would like to use its "multiple" enhancement. I have got following ZSQL Method select * from opps1 where <dtml-sqltest ar column=areas type=string multiple> On the form I use several checkboxes with the same name defined as: <input type="checkbox" name="qname:list" value="<dtml-var q1 >" When I call ZSQL method with parameter ar=qname it doesnt find anything. When I test the ZSQL Method manualy and enter list (e.g. 'area1','area2') of values for "ar" it renders sql as select * from opps1 where ar = '\'area1\',\'area2\'' but according manual I expect(and need) select * from opps1 where ar in ('area1','area2') I have tried this a several times with different values as input but was unsuccesfull to force zope to use "in ()" statement. Instead it takes input as string. Do you have exepriance/hint? Thanks a lot, David Marko

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changing the behaviour of an object with another object
by Ismet Dere 26 Jun '01

26 Jun '01

hello all! maybe this is an old issue but please forgive me, i am a newbie :) in Zope2.3.x for Linux (RH-7.1) is it possible to change the behaviour of an object with another object that comes after it, when you call it from a browser? for few examples: my folders: /web/articles/jane/art1_html /web/BOOKS/fiction_html /web/misc/print_view (print_view is a DTML_Method) www.mydomain.com:8080/web/articles/jane/art1_html (normal view) www.mydomain.com:8080/web/articles/jane/art1_html/print_view (print view) www.mydomain.com:8080/web/BOOKS/fiction_html/print_view (same "print_view" object in use for changing another objects view) www.mydomain.com:8080/web/BOOKS/fiction_html/fancy_view (other possible use) i appreciate any help. ismet

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Using ".." and "."
by smileych＠paradise.net.nz 26 Jun '01

26 Jun '01

Everywhere I look on the tutorials, I see the use of URL0 (or 1 or 2 or whatever). Is there any disadvantages of just using "." when referencing? eg: <dtml-call "RESPONSE.redirect('..')"> to go from "users\update\update_user" document to the "users\" folder An interesting point is that if the document is the index_html, you would only use "." rather than ".." eg: <dtml-call "RESPONSE.redirect('.')"> to go from "users\update\" (the index_html of the update folder) to the "users\" folder So, is this a bad way to reference? Is there any advantage in the URLx referencing? Thanks :) SmileyChris

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Re: [Zope] zope design pattern type question
by Luciano Ramalho 26 Jun '01

26 Jun '01

Gary Poster wrote: > Finally, can I use zcatalog with the field indexing to speed up looking for > the authors in the book collection, or is zcatalog really only for text? That works very well. The Field index type is what you need to quickly fetch related objects. We've been implementing many to many relationships like this example: instances of Book store references to its Authors. Instances if Author know nothing about books, but a convenently indexed Catalog lists the Books by one Author whenever that info is needed. We have re-implemented a 25-table Oracle-based DVD movie catalog in ZODB with 8 ZClasses and 4 Catalogs. It was a great pleasure to drop all the link tables that existed only to satisfy the limitations of a relational database regarding many to many relationships. We are extremely happy with that refactoring (the original site was also done in Zope; the difference was only where the entities where stored). The pure object oriented site became much easier to maintain and extend. And performance did not suffer at all; it may even have improved (although we have no hard data to support that, our fears that a pure ZODB solution could be noticeably slower proved unfounded). Regards, Luciano

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RE: [Zope] Hit counter on zope.org
by James van der Veen 26 Jun '01

26 Jun '01

Hi Olivier, Have a look at this: http://www.zope.org/Members/andym/FSCounter Hope that is something like what you were looking for! James

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Announcement: NY Zope Users Group meeting
by vito 26 Jun '01

26 Jun '01

New York Zope/Python Users Group Place: Friends of eGenius (Variety USA) Date: June 28, coming Thursday Place: 1375 Broadway, 6th Floor (corner of the 37th Street and Broadway) BDQFACE Time: 5:30 PM to 7:30 PM (after 6:30, you can't get into the building) You are invited to the New York Users Group. Let us know if you have topic to present. NY Zope Users Group mailing list for New Yorkers Zope users

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Re: CatalogAware
by Tim Moore 26 Jun '01

26 Jun '01

Great! But unfortunately that doesn't help those of us who already have a collection of ZClasses that are affected by the problems with CatalogAware (can't reparent an existing ZClass). Can one of the DC people let us know if these corrections are scheduled to be merged into the standard CatalogAware? Thanks! Toby Dickenson <tdickenson(a)devmail.geminidataloggers.co.uk> writes: > Chris McDonough <chrism(a)digicool.com> wrote: > > >I actually think this about sums it up. If you have time to look > >at it Toby, it would be much appreciated. I don't think it's a > >very complicated set of fixes, its just not on the radar at the > >moment, and might require some thought about > >backwards-compatibility. > > Not a patch, but Ive fixed all three known CatalogAware problems in > a separate product; a new base class that derives from CatalogAware: > > http://www.zope.org/Members/htrd/BetterCatalogAware/ > > The techniques used in this product have been thoroughly stressed in > several other production systems, but this is the first time they > have been collected together in one place so bugs are possible. > > > >That makes CatalogAware much saner and will produce less > >bloat. Actually, maybe I should just go make that change in the > >trunk and the > >2.4 branch, although I'm a little afraid of what (if anything) it will > >break for everybody. To be honest, I really don't have much time to > >spend thinking about this, and my fears are probably just FUD. > > Im not sure how many people are using CatalogAware; I think many > serious users have been scared off by the problem reports in the > list archives. > > IMO fixing this may be worth a little breakage. > > Toby Dickenson > tdickenson(a)geminidataloggers.com -- Tim Moore

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