March 2001 - Zope - Zope lists

XML and Cocoon-type features
by Mayers, Philip J 11 Mar '01

11 Mar '01

All, Is there any way to do a similar type of thing that Cocoon does, namely publish documents written in an XML-ish type format into multiple formats automatically? Ideally, we'd like to author in DocBook or similar and be able to publish to XHTML (live), text, PDFs and possibly even WML. I know Cocoon can do this - is there anything similar in Zope? Regards, Phil +----------------------------------+ | Phil Mayers, Network Support | | Centre for Computing Services | | Imperial College | +----------------------------------+

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ZMySQL and MySQLdb
by Olaf Zanger 11 Mar '01

11 Mar '01

hi there, i had a zope 2.3 installation under suse 7.0 (python 1.5.2) running wonderfully with connection to mysql (don't know the version anymore) now i installed the same mysql-data,. zope-data on suse 7.1. with mysql 3.22.30 and ZMySQL da 1-2-0 and MySQLdb 0.1.2, python 2.0 now i can use the database, so the data and passwords should be correct. unfortunately, if i connect to the database i get the error message printed in the addendum. is it possible, that i have to recompile the MySQLdb ? what else could be the problem? thanks for help olaf addendum -------------------- Zope Error Zope has encountered an error while publishing this resource. BadRequest Invalid connection string: ipOperate soli-con Traceback (innermost last): File /home/soli-con/ipOffice/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /home/soli-con/ipOffice/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/soli-con/ipOffice/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: RoleManager) File /home/soli-con/ipOffice/lib/python/ZPublisher/Publish.py, line 171, in publish File /home/soli-con/ipOffice/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_open_connection) File /home/soli-con/ipOffice/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: manage_open_connection) File /home/soli-con/ipOffice/lib/python/Shared/DC/ZRDB/Connection.py, line 220, in manage_open_connection (Object: RoleManager) File /home/soli-con/ipOffice/lib/python/Shared/DC/ZRDB/Connection.py, line 240, in connect (Object: RoleManager) File /home/soli-con/ipOffice/lib/python/Products/ZMySQLDA/db.py, line 155, in __init__ BadRequest: (see above) -- soli-con Engineering Zanger, Dipl.-Ing. (FH) Olaf Marc Zanger Lorrainestrasse 23, 3013 Bern / Switzerland fon:+41-31-332 9782, mob:+41-76-572 9782 mailto:olaf.zanger@soli-con.com, http://www.soli-con.com

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Saturday morning SELECT
by Paz 11 Mar '01

11 Mar '01

Morning/Afternoon/Night, Lazy Saturday morning, and I can't be bothered to leave the house. I've made a little template, but Im wondering if its Pandora's box... >ZSQL Method< select:required as:optional from:required where:optional select <dtml-var select> <dtml-if "as">as <dtml-var as></dtml-if> from <dtml-var from> <dtml-if "where">where <dtml-var where></dtml-if> <dtml-if "operand"><dtml-var operand></dtml-if> <dtml-if "equals"><dtml-var equals></dtml-if> It renders any way you please... Obviously you need very tight security on this as to who can access it... But other than using AUTHENTICATED_USER, is there any possible way you might exploit this? I have a habit of doing most of my work in the db, and something like this would totally ease the way I build forms..... Thanks, Paul Zwarts

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IPC9 Thoughts aka YACR
by ender 11 Mar '01

11 Mar '01

Yet Another Conference Report from IPC9 my thoughts on spending a few days at the conference. it was a blast. i finally got to put some faces to some names that i see on this list and other python lists, and got a chance to hang out with some DC folks. these guys like to party. word to the wise, beware those bearing snake tatoos:) Zope Stuff -DC reaches out to developers. DC in its everlasting wisdom has seen the light. namely, that zope should be KISSing developers not forcing them on the infamous Z (rotate 90%) learning curve. Zope will grow its market share and walk new roads when Zope embraces the developers that use it so they can create kickass products with their favorite appserver. so how does this mystical feat happen. (check list) 1. DC realizes that this is a good thing (TM). X Check 2. Zope goes modular, components and interfaces all the way. (Its coming). 3. Documentation is driven by interfaces and written for developers. (Its Coming) -Interfaces and Components This talk by Michel Pelletier was cool. Michel demonstrated some of the ideas and technologies that Zope will be embracing. I think this part has been overlooked by most of the conference reports, but i feel it is the best thing to happen to zope since.... well zope. nutshell version. components, interfaces, services, adaptors, something i forgot. basically everything zope has an interface, instead of subclassing a half-dozen classes to get standard zope behavior you can have your objects implement the proper interface and be done with it. Interfaces are all about separating the API from the implementation. which in the case of zope is desparetly needed. but wait there's so much more. you can hook up objects with different interfaces via adaptors. you can have some objects provide services like discovery of objects with particular interfaces... michel didn't finish his presentation but the kicker was a demo of a new type of publishing based on the component/interface architecture. drool factor X. i could use this in applications right now, if only DC would release the code (hint, hint, hint...). oh well, i'll settle for the paper for now. basically it worked like this, the publishing method would take an object and the Interface of the request (standard would be HTTPRequest) and a factory object would return an adaptor object which could connect the two interfaces. the publish method would call the adaptors traverse function to get the next object if didn't exist then it would call the last object found's publish method. imagine the possbililties, selectively opening up your zope objects to new protocols (xmlrpc, soap). traversing sql/ldap databases. zope arch outside of the web.... but there is so much more to the component model, you can walk up to an object and ask it what interfaces it supports so you can interact with it dynamically at run time. you can generate accurate documentation about your objects from the interfaces. you could create some nifty translators that would make your objects xpcom accessible, generate wdsl. (these are michel's ideas not mine). zope developers, get excited. the changes won't come all at once but the gradual changes might be astonishing enough. to see some examples of interfaces, basic components in action dig through the CMF. interfaces are in 2.3 btw lib/python/Interfaces side note - i heard a saying that sometimes when you think you've got an idea you can talk to jim fulton, and he can just say you're wrong, and bam it hits you. you're wrong. and then it happened to me:) -Debugging the zope way. check it out, (it helps if you're running zeo so you can browse and type), else shutdown your zope. cd lib/python/ python >import Zope >Zope.debug('http://localhost:8080/foo/index_html?bar=a) (theres lots more to it than that but thats what i remember). if something breaks you get to keep both pieces. aka i'm not being held responsible if you hose something. -emacs is cool. diehards unix types already knew this (whats vi?), but kenM of dc has a patch that jim fulton was using when demonstrating zope debuging that moved you to the appriopate file and method call.... my jaw is still recovering from the floor. i guess nowadays, when every python ide worth its salt (wing, komodo) can do this its no longer amazing, but damm i was impressed. -ZEO is distributed zope (duh) i don't know why this didn't hit me before, but zeo lets you do all sorts of new apps with zope, basically offering cheap python distributed communication and interaction. i've been searching for ways to interact with zope my python proggies, but my thoughts previously have always focused on shared external data stores, i hadn't really thought long enough about ZEO possibilities. -Pythonlabs goes ZODB - nough said - new berkely db zodb storage (no reference counting). - multimaster replication is good for you. (many moons will pass). - can you say zope has great documentation. not yet, but it looks like its coming. - Emacs is the life, but wingide just took my soul. i can't say enough good things about wing. bottom line, it saves me a lot of typing. i think the company is cool, they're giving back to the community both with key pieces of technology and offering open source developers free licenses. (please buy a copy anyways, they need the loot to make it boot). did i mention that the source browser kicksass and you can debug zope with it:) - I need more speed Scotty, philip elby and ty sarna are back at it again. they're trying to make your head hurt, but this time they're armed with documentation, so the not so oo, AOP, GP, enlightened can grasp on to something. meet transwarp, the successor to zpatterns. (interestingly enough philip admitted that zpatterns was one glorious hack on delegation in zope). and even better its not zope dependent. um... i can't really say much about this one just check out philip's zope.org page for more info. he started weaving and i started dodging:) between this and the component technology that should come into zope Other Web Stuff -webware - what can i say.... i like it. its not mature yet, but the source is readable (i will never accept the 1 letter variable name optimizations in zope), and its based on existing mature technologies namely java servlets, j2ee's entity beans (the MiddleKit OR mapper) and Apple Enterprise Web Objects. since i'm posting to the zope list, i'll let you find the url. i think there is some potential for cross-pollination of ideas and code here, if the license issues are compatible (i think they are). TaskKit a generic python daemon scheduler would be extremely cool to have in zope. -pywx/aolserver - Micheal Haggerty and Titus Brown have pulled off one hell of a piece of enginerring IMO. they took aolserver, an extermely high performance multithreaded webserver (it powers aol, and ArsDigita.com bet their business on it a long time ago), that was years ahead of its time (it came out in like 95), and comes with persistent db connections, a rich api that rivals some operating systems, and tcl as scripting language, and they made python a first class peer with tcl in it. (i like run ons, can you tell). i watched them at the conference where they basically made a webware adaptor in like 20 mins. zopitistas take note, these guys are seriously investigating replacing zserver with aolserver. besides having a high performance web server written in c, it will also allow you much greater flexibility in caching, since you can use aolserver to cache in memory (shared by all threads). incidentally i use aolserver with the acs (arsDigita) and its a nice platform, but if i could use python with it yikes, its scary. i can't even imagine using zope with it.... Random Artifacts -java in zope. JPE ... nough said, check it at also check phil harris's post on the matter to zope-dev a few months ago. http://www.arakne.com/jpe.htm -berkely db - robin dunn, updated cvs sometime today, because i just got the latest berkely db 3.2.9 linked up with bddb3 (the python module), and it passed the 130 odd unit tests included. very cool, nice work robin. Sign This Petition - IPC10 in amsterdam. well that was the petition at ipc9. dtml-contract - part shameless plug, part sheepless grin. i got some pointers from mr fulton on how to make this product work better, but i put out two releases which had indent errors in the same day. yikes, i think beer affects debugging:). anyways this very cool dtml tag is now functional and ready for downloads at http://www.zope.org/Members/k_vertigo/ZopeProducts/PageContract btw, if enough people bug me about the license being obnoxious i'll switch it to the LPGL (ChrisW, what are you waiting for:) this concludes YACR cheers kapil thangavelu

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RE: [Zope] Acquisition Problem ?
by Richard Moon 11 Mar '01

11 Mar '01

Thanks for the help But what we have here is an object, a dtml method, which behaves completely differently depending on how it is referenced. Can anyone tell me why that is a good thing ? To me it seems a very bad thing. - that's the thing with Zope - going along fine then it does something completely irrational. At 19:47 09/03/01, you wrote: >You have an instance of variable-clobbering. abc_text is acquired from the >dtml-let inside mydtml_1. You have set the value in REQUEST, but REQUEST is >at the bottom of the list when variable names are looked up. This is >explained on page 15 of the Document Template Markup Language Reference. >Unfortunately, I can't find a link for it. > >Ok, I found it in the Zope Book >http://www.zope.org/Members/michel/ZB/AdvDTML.dtml >First section. > >Troy > >-----Original Message----- >From: Richard Moon [mailto:richard@dcs.co.uk] >Sent: Friday, March 09, 2001 12:56 PM >To: zope(a)zope.org >Subject: [Zope] Acquisition Problem ? > > >Can anyone explain what's going on here - please ? > >I've got a dtml method 'mydtml_1' which processes a file uploaded via a >form - like this > ><dtml-in "abcfile_read(REQUEST)"> > <dtml-let abc_text=sequence-item> > <dtml-unless "_.len(abc_text)==0"> > <dtml-var mydtml_2> > </dtml-unless> > </dtml-let> ></dtml-in> > >In the dtml method mydtml_2 I have some code like this > ><dtml-var >expr="REQUEST.set('abc_text',external_method_that_returns_hello_world(abc_te >xt))> ><dtml-var REQUEST> ><dtml-var abc_text> > >What happens is that the ><dtml-var REQUEST> shows abc_text having the new value of "Hello World" > >but the ><dtml-var abc_text> shows the value as it was in mydtml_1 > >Presumably <dtml-var abc_text> is acquiring the value from mydtml_1. > >Can anyone tell me why ? > >And how to get <dtml-var abc_text> to return the value I want i.e. "Hello >World" ? > >This is Zope 2.2.1 > > >(Note - if I do not put <dtml-var mydtml_2> inside the <dtml-in> and ><dtml-let> constructs then it works as expected, e.g. ><dtml-call "REQUEST.set('abc_text','Goodbye Forever')"> ><dtml-var mydtml_2> > > will render "Hello World" ) > >Many thanks > > >Richard Moon >richard(a)dcs.co.uk > > > >_______________________________________________ >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 ) Richard Moon richard(a)dcs.co.uk

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Editor for 2.3 ftp/webdav
by Georg Rellensmann 11 Mar '01

11 Mar '01

I used HTML Kit to edit ZOPE DTML content via ftp. Unfortunately file upload doesn´t work anymore with ZOPE 2.3. Is there a patch or workaround available to use ftp or webdav for editing in ZOPE 2.3? What editor do you use for this purpose? thanks, -georg-

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ZPT, a next-generation template technology
by Hamish Lawson 11 Mar '01

11 Mar '01

The Zope Presentation Templates project is underway to develop a next-generation template technology for Zope* that is XHTML-compliant and which makes it easier for designers to work with. However it is hoped to design it in such a way that as much as possible is not specific to Zope, in the belief that the technology is more widely useful and could be adopted by other languages and tools. I'm extending an invitation (in a personal capacity rather than as an official spokesman for the project) to developers from other communities to consider contributing to the design of ZPT to help keep it language-independent, and to consider implementing the approach in their programming language of choice. First of all some background on what I mean by "next-generation". In the beginning programmers wrote program code with embedded HTML. Then technologies like eperl, ASP, JSP and PHP allowed us to reverse this and to embed program code in the HTML. However a school of thought wanted to have greater separation of presentation and logic, and so various template mechanisms were devised that provided just enough programmability to control presentation, but which moved the business logic out elsewhere. One example of this approach is Freemarker: <h1>$customername</h1> <table border="1"> <tr> <td>Date</td> <td>Amount</td> </tr> <list deposits as deposit> <tr> <td>${deposit.date}</td> <td>${deposit.amount}</td> </tr> </list> </table> Instead of custom tags, some other template mechanisms use special markers to designate control structures, but most template mechanisms share the property that their templates are not compliant with XHTML (though the rendered output may be). As such it can be awkward trying to use such template mechanisms with authoring tools that only understand XHTML. The approach that the ZPT project is pursuing is to attach the control-flow, formatting and placeholder directives as attributes of standard XHTML tags. The example above becomes something like: <h1 zpt:insert="customername">Bob Smith</h1> <table border="1"> <tr> <td>Date</td> <td>Amount</td> </tr> <tr zpt:repeat="deposit deposits"> <td zpt:insert="deposit/date">01/02/2001</td> <td zpt:insert="deposit/amount">23.40</td> </tr> </table> This is not only valid XHTML, but (borrowing an idea from Enhydra's XMLC template scheme) the ZPT template scheme allows prototypical content to be used as a proxy for the data to be substituted, so making it easier to work with in an authoring tool. An overview of the ZPT project can be found at http://www.zope.org/Wikis/DevSite/Projects/ZPT/VisionStatement More information on ZPT's attribute language is at http://www.zope.org//Wikis/DevSite/Projects/ZPT/TAL Hamish Lawson * Zope is a leading open-source web application server and content-management framework; it is written in Python. ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie

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dtml-tree: Folder listing from different area(s)
by sbabu＠tnc.org 10 Mar '01

10 Mar '01

Hi, I've a requirement where my application needs to just browse the folder listing using collapsible/expandable trees. dtml-tree is just perfect for this. My application has a DTML document called /myapplication/browse_files.htm I pass a variable to this called BASEURL and that is the root URL from where I want the hierarchy to be displayed. Code is like this: Assume BASEURL has a value http://localhost:8080/mysite1/subsite2/ <dtml-try> <dtml-with "REQUEST.resolve_url(BASEURL)"> <dtml-call "REQUEST.set('currFolderId',id)"> <dtml-tree currFolderId branches_expr="objectValues(['Folder', 'DTML Document','Image','File'])" nowrap=1 sort=id> <IMG SRC="<dtml-var SCRIPT_NAME>/<dtml-var icon>"> <A HREF="<dtml-var absolute_url>"><dtml-var title_or_id></a> </dtml-tree> </dtml-with> <dtml-except> Error here </dtml-try> Now it all works fine initially. When the + sign is clicked to expand a folder, the BASEURL is not passed forward to the resulting display. That causes an error. I'm now passing BASEURL as a session variable, which I think is an ugly solution. My question is: 1. Is there any way I can pass BASEURL to the URLs generated when tree is browsed? 2. Or is there anyway this BASEURL thing can be avoided in the drill-down pages? If it helps, my application is something which will allow users to browse the folder structure and choose a document to make a hyper link from their document. Any pointers, solutions etc will be greatly appreciated. TIA http://vsbabu.csoft.net "The man who smiles when things go wrong has thought of someone to blame it on." --- Jone's Law

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The first site?
by Zopista 10 Mar '01

10 Mar '01

http://www.zopezen.org/#powered is this a world's first? -- Zopista

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Re: [Zope] Image refresh
by Dieter Maurer 10 Mar '01

10 Mar '01

Patrick writes: > And this works fine.Now, I want to change render-image_dtml so that new > images are loaded everytime the page is refreshed by a certain user and so > that the images change automatically if the same page is viewed for say, > 5 minutes. Any ideas? If you want the images chosen randomly (from an image reservoir), then you can use the "whrandom" module, available via the DTML namespace. In any case, the solution depends on how you want to select the images to be displayed during a refresh .... Dieter

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