November 1999 - Zope

<code> tag?
by Mike Winter 24 May '00

24 May '00

Hi, just a quick question: how do you get Zope to display DTML without evaluating it? -- Mike Winter | mfw127(a)mail.usask.ca U. of S: 966-4759 TR Labs: 668-9323

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FYI: Zope Weekly News
by Mike Pelletier 23 May '00

23 May '00

G'day, Zope Weekly News is a digest of some of the useful and interesting events which have occurred on the various Zope mailing lists and the Zope.org site. It is published each Wednesday evening. New Products and Announcements * Paul Everitt announces Sybase support in a joint press release. http://lists.zope.org/pipermail/zope/1999-November/013946.html http://www.digicool.com/News/Sybase * "Zen" released ZRadius, a product which allows you to authenticate web users via the Radius authentication protocol. http://www.zope.org/Members/Zen/ZRadius * Anthony Pfrunder announces VisualZope 0.1a. From his web page: Basically, the "goal" of VZ is to provide a SIMPLE visual editing system for graphic designers which works cross-browser and takes advantage of the acquisition and role systems within Zope. What follows is a brief description of the components which make up the final VZ system (probably more accurate than previous posts). http://163.182.196.200/zwiki/VisualZope * Jeff Sheldon has started a weblog of his experiences with Zope. Jeff Sheldon is new to Zope, and is not a professional programmer. His weblog is a valuable resource to those also starting out with Zope. http://weblogs.userland.com/zopeNewbies/stories/storyReader$0 Updates * Zope 2.1.0 beta 2 has been released. This release includes fixes for issues found in beta 1, an updated load_site.py script and Martijn Pieters' patches to implement try/except/else and try/finally in DTML. Unless something major comes up, this will be the final beta before 2.1.0 final. http://www.zope.org/Products/Zope/2.1.0b2/ * "4am" has submitted an update to his PythonMethod product. It allows methods, written in Python, to be created via the Zope web management interface. http://www.zope.org/Members/4am/PythonMethod * "Drew" contributed an update to his Photo product. It generates thumbnail views of images at the user's preferred size. Requires PIL. http://www.zope.org/Members/Drew/Photo * Itamar Shtull-Trauring announced ZCache v0.2. ZCache is a Python Product which allows you to cache expensive methods, taking strain off your server. It also generates 'Last-Modified' headers, aiding browser and proxy caches. http://lists.zope.org/pipermail/zope/1999-November/014115.html http://www.zope.org/Members/itamar/ZCache Zope.org items * "Zen" submitted a tip he picked up from Michel Pelletier. He explains how volatile attributes work, and how to populate them when your object is loaded from the database. Volatile attributes are attributes which do not get written to the database, and are good for data which changes frequently. http://www.zope.org/Members/Zen/tips/VolatileAttributes * "AlexR" submitted a How-To detailing the use of the DTML entity syntax. "DTML entities" are chunks of DTML which look like this: "&dtml-title_or_id;" http://www.zope.org/Members/AlexR/EntitySyntax Notable Discussions * DTML is a HUGE topic this week. Discussions spill across several lists. A very good job is done of identifying DTML's weak points. Many hold that the difficulty in using DTML comes from it's roots as a reporting language-- it isn't supposed to be used for logic. The problem is, there isn't yet an easy replacement for DTML as a programming language. Python Methods are cited as an excellent start on providing a means of moving logic out of DTML. Christopher Petrilli mentions that DC is looking at grooming Python Methods for inclusion in Zope. Others feel that reporting vs. programming is a forced distinction, and that it is awkward to have to use two different solutions. The claim that generating HTML is actually a rather complex task, and the powerful but ugly features of DTML are a necessary evil. DTML is compared to Perl! <gasp!> Otherwise, lots of very useful tips for using DTML are revealed. An excellent read for DTML beginners and wizards alike. http://lists.zope.org/pipermail/zope/1999-November/013710.html http://lists.zope.org/pipermail/zope-dev/1999-November/002088.html http://lists.zope.org/pipermail/zope-dev/1999-November/002102.html * Darcy Clark alerts the list of Jon Udell's latest article mentioning Zope. Jon's article discusses the ease of using Zope with Windows databases, the pain of using it with Unix databases, cheers ODBC, and jeers lack of a similar magic bullet for Unix. The thread then continues to discuss the relative merits of various free databases and using them with Zope. http://www.byte.com/column/BYT19991104S0001 http://lists.zope.org/pipermail/zope/1999-November/013711.html Also, Karl Fast does an excellent job of summarising the thread, generating more sage comments. http://lists.zope.org/pipermail/zope/1999-November/013762.html http://lists.zope.org/pipermail/zope/1999-November/013812.html http://lists.zope.org/pipermail/zope/1999-November/013813.html http://lists.zope.org/pipermail/zope/1999-November/013840.html * Francois-Regis CHALAOUX posed a question about using Zope with virtual hosting. Several useful responses were generated. http://lists.zope.org/pipermail/zope/1999-November/013678.html http://lists.zope.org/pipermail/zope/1999-November/013688.html * Ben Galbraith submitted a comparison of Zope and Cold Fusion and solicited comments. Some of the usual suspects offer theirs. http://lists.zope.org/pipermail/zope/1999-November/013730.html * Otto Hammersmith started a thread about Zope and security. In it, he speaks of some of the security pitfalls that unsuspecting Zope users could experience. Brian Lloyd submits some solutions. http://lists.zope.org/pipermail/zope/1999-November/013779.html * Paul Everitt wrote in to remind us that there is a zope-dev(a)zope.org list for technical discussions. A brisk discussion developed to debate what constituted a technical discussion. http://lists.zope.org/pipermail/zope/1999-November/013796.html * Theodore Patrick launched a lengthy thread with questions about the effect of threading in Zope. A number of folks from Digital Creations provide answers. The discussion moves on with high volume and content to the topics of benchmarking and performance tuning Zope. http://lists.zope.org/pipermail/zope/1999-November/013808.html * Farzad Farid revives the uncacheable image thread. Because Acquisition can lead to different URLs being generated for images when viewed from different locations, it makes caching difficult and can generate excessive traffic. Others offer advice to solve this problem. http://lists.zope.org/pipermail/zope/1999-November/014021.html * David Harrison asks zope-dev how to return an image generated on-the-fly by an External Method. Answers found. http://lists.zope.org/pipermail/zope-dev/1999-November/002107.html Mike Pelletier

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passing REQUEST.form to frames
by Hannu Krosing 09 Dec '99

09 Dec '99

What is the correct syntax for passing form data to child frames of a frameset ? I would like to pass form fields that is submitted to frameset to child frames. Is there any alternative built-in syntax to using an ugly construct like this : =& ------------------ Hannu

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RE: [Zope] aborting DTML parsing
by Michel Pelletier 06 Dec '99

06 Dec '99

> -----Original Message----- > From: Jan Stohner [mailto:stohner@drze.de] > Sent: Friday, November 26, 1999 10:13 AM > To: zope(a)zope.org > Subject: [Zope] aborting DTML parsing > > > Hello, > > i know that i can use <dtml-return> to return data from a > DTML method. For > example, when standard_html_header is called from a DTML > document and i use > <dtml-return> in standard_html_header, i'm back in the > document with the > result from the return tag. > > I am searching for a method to stop rendering at all, no > matter how deep > method calls are nested (a "return" would now stop rendering of the > complete document). > > I searched the Mailing List archive but was only able to find > a similar > question (from Anthony Baxter, April 21), but not an answer. > > Is there a quick solution? I had the idea to implement a > <dtml-quit> tag > which is similar to <dtml-return> but raises a different > exception, but i > wasn't able to find the right place in the sources to catch > this exception. Just raise an error way down deep, and catch it at the higher method with <dtml-try> and <dtml-except>. I think these tags were added in 2.0.0 -Michel

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RE: [Zope] server stopping
by Michel Pelletier 02 Dec '99

02 Dec '99

> -----Original Message----- > From: Anthony Baxter [mailto:anthony@interlink.com.au] > Sent: Tuesday, November 30, 1999 5:02 PM > To: Doug Hellmann > Cc: Adam Gotheridge; zope > Subject: Re: [Zope] server stopping > > > > Can you address this by firing up more publishing threads? It doesn't really matter past seven threads, you can fire up as many as you want but there is a hardwired limit on database connections, 7. -Michel

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regex question
by Sam Gendler 02 Dec '99

02 Dec '99

I have never been much of a regex master, and I am having difficulty constructing one that should be fairly simple. I want to find all the text that is between <body> and </body> in a variable that may (and probably will) contain newlines. I am removing case insensitive searches in the following examples in order to make the regex's simpler. To grab find the opening <body> tag, I have '<[\t ]*body[\t ]*.*>' which is almost correct, but not quite. This expression finds <bodystuff>, too, so I really need something that finds '<\t ]*body(\t ]+.*>)|(>)', but I can't find a construct that works. Basically, it needs at least one whitespace followed by stuff followed by '>', or else it needs no whitespace followed by '>' I can use similar code to find the </body> tag. However, putting those two together around a $\(.*\n*$*\), in order to match all the text between the <body> and </body> tags sends python into an infinite loop. It doesn't like it when I try to match an unlimited number of lines.before the </body> tag I could use two regsub.split calls to break the variable into its respective parts (assuming I can sort out the first problem), but regsub is written in python, while regex is written in c (or so I am told), so I would prefer to use regex. Please help. Generally, whenever I ask a mailing list for regex help, it always turns out to be somehing boneheaded that I am missing, so try not to laugh at me ;-) --sam

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ZOracle - support for LOB [Q]
by Bruno Mattarollo 02 Dec '99

02 Dec '99

Hello. I am trying to fetch and insert LOB fields into Oracle8i... I have read the DCOracle.txt where it states that LOB are supported if fetchdone() is used. But are LOB supported using ZOracleDA? Has someone set up some Zope site using LOBs in Oracle8i? I need to store articles from our writers that are supposed to be superior to 4KB in size so VARCHAR2 is not enough and we do not want to store them in separate files because we want to have all inside our Oracle Database. Sorry to post so many questions in so many days, but we are getting closer to release date and I am trying to finish all our development. TIA /B Bruno Mattarollo <brunomadv(a)ciudad.com.ar> --- Python Powered <http://www.python.org/psa/>

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Tree Tag of PARENT object
by Jason Spisak 02 Dec '99

02 Dec '99

Zopists, I have been trying like the dickens to get the tree tag of a PARENT object, to no avail. <dtml-with "PARENTS[1]"> <dtml-tree>... </dtml-with> And all the variations thereof, arent bringing my the tree from the PARENTS point of view. If I do a <dtml-var "PARENTS[1].my_tree"> of course I just get the html back, not the rendered tree tag. Any ideas? I am trying to get the tree tag of the PARENT object. (Don't ask, don't tell:-) All my best, -- Jason Spisak webmaster(a)hiretechs.com

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htmllib question
by Sam Gendler 01 Dec '99

01 Dec '99

I thought I had a pretty clean solution for extracting all the contents between the <body> </body> tags of an uploaded html file, using the htmllib. Basically, in start_body, I call save_bgn(), and in end_body, I call save_end(), which was supposed to save all the contents between the two tags. Unfortunately, it saves only the content that isn't in html tags. All the subsequent tags get dropped. Does anyone know an easy way around this? The only method that I see is to overload the unknown tag functions to pu tthe tags back into a buffer, which is WAY more effort than it is worth. --sam

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Trouble calling external method from userAuthenticate in GUF
by Andres Corrada 01 Dec '99

01 Dec '99

Hi, Here I am banging my head on the wall once again. Zope treats me so cruelly, it entices me with goodies but just when the plum is in my hand...it vanishes. I'm now trying to use GenericUserFolder to do a complex authentication procedure on a "members" page. I've wrapped GUF.userAuthenticate around an external method that resides in the acl_users folder, but Zope refuses to acknowledge the existence of the method. The GUF SQL How-To talks about using ZSQL methods, can I not use external methods inside the GUF hook functions? Thank you for your patience in dealing with this troubled newbie. ------------------------------------------------------ Andres Corrada-Emmanuel Email: andres(a)corrada.com Owner http://www.corrada.com/mamey Mamey Phone: (413) 587-9595 ------------------------------------------------------

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