January 2000 - Zope - Zope lists

BannerFolder banner and aquisition?
by Bill Anderson 20 Jan '00

20 Jan '00

OK, having been a while since I last worked on a non-horrible-kludge banner product, I decided to give BannerFolder a shot. Works quite well. However, it is only fo rbanners where the image is stored locally. Many banners these days are not done this way, rather you get a full href, including an <img src=....> tag. So what I thought I would start with was to add a property called local, and modify Banner's render method to return _jusr_ the hit_URL for non-local banners. Works fine except when it comes time to render the image. Th eimage is always broken. After some digging, I determined that Zope is inserting the bannerfolder's id into the image tag's image tag such that: <img src="<http://link-toimage-on-other-site"> becomes: <img src="hbanner/http://link-toimage-on-other-site"> Now, what I was doing in my banner kludge was to have the same basic setup, and I used a with tag for the banner folder. So, my question is "how do I get Zope to _not_ put the 'hbanner/' into the img src tag?" That aside, anyone know of any good way of implementing a weighting mechanism to work with BannerFolder? So far, I have an idea about creating a list of banners to choose from, banners would have a weight of 1, with the weight being the number of times they appear in the list. Thoughts? (this aspect of the question may be more sutied to the zope-commerce list) Bill -- In flying I have learned that carelessness and overconfidence are usually far more dangerous than deliberately accepted risks. -- Wilbur Wright in a letter to his father, September 1900

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ZSQL Methods and +
by Matt Miller 20 Jan '00

20 Jan '00

I have just joined this list, so forgive me as I break my cardinal rule of reaidng a list for a while before posting. I am working on a banner ad rotation system for my Zope installation. To that end I am using a rather simple algorithm to determine which ad should be shown: Each time an ad is selected, ads not shown have their "notshown" count incremented by 2. An ad is selected whenever the number of impressions remaining PLUS its "notshown" is the largest in the DB. To that end I am trying to use the following query template to return the pointers to the ad to be displayed: select image, alt, id, imprem+notshown as fr from ads where imprem > 0 order by fr DESC LIMIT 1 As I quickly discovered the use of the '+' causes Zope to choke with a "keyError": Error, exceptions.KeyError: unhandled SQL used: select image, alt, id, imprem+notshown as fr from ads where imprem > 0 order by fr desc LIMIT 1 Traceback (innermost last): File /usr/local/www/Zope-2.0.0b5/lib/python/ZPublisher/Publish.py, line 209, in publish_module File /usr/local/www/Zope-2.0.0b5/lib/python/ZPublisher/Publish.py, line 179, in publish File /usr/local/www/Zope-2.0.0b5/lib/python/Zope/__init__.py, line 199, in zpublisher_exception_hook (Object: getad) File /usr/local/www/Zope-2.0.0b5/lib/python/ZPublisher/Publish.py, line 165, in publish File /usr/local/www/Zope-2.0.0b5/lib/python/ZPublisher/mapply.py, line 154, in mapply (Object: manage_test) File /usr/local/www/Zope-2.0.0b5/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: manage_test) File /usr/local/www/Zope-2.0.0b5/lib/python/Shared/DC/ZRDB/DA.py, line 310, in manage_test (Object: getad) File /usr/local/www/Zope-2.0.0b5/lib/python/Shared/DC/ZRDB/DA.py, line 291, in manage_test (Object: getad) File /usr/local/www/Zope-2.0.0b5/lib/python/Shared/DC/ZRDB/DA.py, line 395, in __call__ (Object: getad) File lib/python/Products/ZMySQLDA/db.py, line 191, in query KeyError: (see above) Is this a known problem? Have I done something incredibly stupid? I am able to use this syntax from the mysql monitor as well as in perl cripts. I have tried various combos of parens and escaping, to no avail. Thanks. -- Matt Miller matt.miller(a)thelinuxstore.com

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RE: [Zope] WebDAV, Zope object locking
by Hung Jung Lu 20 Jan '00

20 Jan '00

>From: Michel Pelletier > > When several people are working on the same site, > > what is the current approach in preventing two > > people modifying the same object? >Lock the object in a version so that the user who is not currently >logged into the version gets an error when they try to modify the >object. Wow! I never played with Zope version feature, partially because I am used to Microsoft's Visual Source Safe and it is a monsterous pain. Zope's version feature is so much simpler and makes so much more sense! I am impressed. I guess I'll have to be more careful with what Microsoft wants to make me believe. :) thanks! Hung Jung ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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Editing Properties of ZClasses
by James W. Howe 20 Jan '00

20 Jan '00

I've just created a ZClass which subclasses from Image. I've added a property sheet to allow for an additional attribute called caption. I tweaked the factory/addForm/add methods to let a user specify the caption when they specify an image. Basically the add form is just like you see with an Image add, except there is an additional field for the caption. My ZClass currently has views for things like Edit, Upload, Properties, etc which it mostly inherited from Image. The Properties view displays the property sheet appropriate for my ZClass. What I would like to do, however, is let the user modify the caption property from the Edit screen instead of the Properties screen. I used the code from imageEdit.dtml and made modifications to show the caption value and to let the user change it. However, the caption doesn't show up. I think I understand why (the caption property is in a property sheet which isn't visible to this particular DTMLMethod) but I'm not sure how to fix the problem. Can anyone provide some suggestions? Thanks. James W. Howe mailto:jwh@allencreek.com Allen Creek Software, Inc. pgpkey: http://ic.net/~jwh/pgpkey.html Ann Arbor, MI 48103

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Re: [WEB4LIB] Zope, anyone?
by TMGB 20 Jan '00

20 Jan '00

Sorry for duplication but I thought Zope supporters and users would be interested in the publicity. Zope was created by the people at Digital Creations ( http://www.digicool.com ) . I've set up Zope running on its own "Z Server" with a database connector to a MySQL database on an Intel NT P75 machine. I am using the database as an 'Ask a Librarian' page which will go public soon. Zope can be used in conjunction with other WEB servers or by itself. With my Ask a Librarian project the end user submits a regular html form to ask a question to a librarian. The form submits the patron name, email address, phone, and question. These are all fields in the MySQL database. I've also set two fields in the database, date and Record number, to be automatically filled in when this form is submitted. Using sql and forms my reference librarians can respond to the questions via email and the response is added to the database. Librarians can contact other librarians through the use of the forms for help with questions. The question can be added to the FAQ list by clicking a check box for FAQ. Using SQL search capabilities I can make a search form for the FAQ. Using MySQL, I can add fields at anytime to the database. I frequently use the Librarians user names in drop down boxes throughout this project. Since Zope is object oriented, I've only had to create the list of user names once and refer to the object when needed for a drop down list. This product is capable of far more than the simple uses I put it through. As soon as I return from the 8th International Python Conference in DC next week I will be setting Zope up on my Linux server. For lack of a better description, Zope is built on Python. And from the Python web site ( http://www.python.org ) I quote: "Python is an interpreted, interactive, object-oriented programming language. It is often compared to Tcl, Perl, Scheme or Java. " After I've copied the ZOPE data file from the NT machine to the Linux Server, I'll send the NT URL to the WEB4LIB list so you can view the management screen and application. What's really neat is that when I move to the Linux server the Ask a Librarian database will continue to receive data as normal with no fixes or translations needed ( at least theoretically ;^) ). Rock and Rule, Thomas Roy Tennant wrote: > > Is anyone out there messing around with Zope? (see http://www.zope.org/) > It's an open source Web application server package that integrates nicely > with Apache and (reportedly) has strong XML suppport. Thanks, > Roy -- -------------------------------------------------------------------- Rock and Rule Zope Rocks -- http://www.zope.org Python Rules -- http://www.python.org -------------------------------------------------------------------- Thomas McMillan Grant Bennett Appalachian State University Computer Consultant II University Library bennettt(a)am.appstate.edu http://www.library.appstate.edu/webmaster/ Voice: 828 262 6587 FAX: 828 262 3001 Windows 95 is a 32-bit extension to a 16-bit patch for an 8-bit operating system that was originally coded for a 4-bit microprocessor. - Chris Dunphy Boot Magazine

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RE: [Zope] Environment Variable
by Martijn Pieters 20 Jan '00

20 Jan '00

> -----Original Message----- > From: Michel Pelletier [mailto:michel@digicool.com] > > -----Original Message----- > > From: Daniel G. Rusch [mailto:drusch@globalcrossing.com] > > Hey all, > > > > I'm strecthing my area of expertise here, but I had our sys > > admin set an > > Environment Variable in etc/profile and a different > > Environment Variable > > in Apache. I don't seem to be able to access either. > > I've tried <dtml-var "REQUEST['varname']">, but that throws > > an KeyError. > > Any thoughts. > > It looks like there is no generic DTML inteface to env variables, the > REQUEST obj does get some env vars but only those defined in the CGI > spec. > > I suspect the easiest solution is to write an external method that > examines your environment. > > import os > > def getEnvVar(var): > return os.environ[var] > > or something like that. And if you want to have a quick peak at what actually is in REQUEST, just add it to the URL, like www.yourserver.dom/REQUEST -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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RE: [Zope] Environment Variable
by Michel Pelletier 20 Jan '00

20 Jan '00

> -----Original Message----- > From: Daniel G. Rusch [mailto:drusch@globalcrossing.com] > Sent: Thursday, January 20, 2000 11:55 AM > To: Phil Harris; zope(a)zope.org > Subject: Re: [Zope] Environment Variable > > > Hey all, > > I'm strecthing my area of expertise here, but I had our sys > admin set an > Environment Variable in etc/profile and a different > Environment Variable > in Apache. I don't seem to be able to access either. > I've tried <dtml-var "REQUEST['varname']">, but that throws > an KeyError. > Any thoughts. It looks like there is no generic DTML inteface to env variables, the REQUEST obj does get some env vars but only those defined in the CGI spec. I suspect the easiest solution is to write an external method that examines your environment. import os def getEnvVar(var): return os.environ[var] or something like that. -Michel

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Re: [Zope] Where does Zope store HTTP file uploads?
by J C Lawrence 20 Jan '00

20 Jan '00

On Wed, 19 Jan 2000 16:02:22 -0000 Phil Harris <phil.harris(a)zope.co.uk> wrote: > In my case there was 'traffic' in the c:\temp dir. > Is there such a notion on Unix? Unix systems commonly have multiple "temp" directories, /tmp, /usr/tmp, and /var/tmp being the common ones, each with slightly different policies as to when they will be cleared out and their contents deleted. Last I checked Python's tempfile() used /tmp by default. -- J C Lawrence Home: claw(a)kanga.nu ----------(*) Other: coder(a)kanga.nu --=| A man is as sane as he is dangerous to his environment |=--

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Python base class for ZClass.
by Jeff K. Hoffman 20 Jan '00

20 Jan '00

Hello, all. I'm in the process of developing some ZClasses for a project we're working on. I am very familiar with the restrictions on changing the base class(es) of a ZClass, and would like to follow Michel Pelletier's (and other's) recommendation of having a Python base class for my ZClass. I know how to do it. I have gotten it working. However, I can't figure out how to structure my directory tree satisfactorily. Logically, both the Python base class and its associated ZClasses are part of one Product (at least, in my head they are.) However, I'm not so sure this is true when it comes to implementation. Products added through the Control Panel (for storing ZClasses) do not make a directory in lib/python/Products. So, I figured I could place my python base class in lib/python/Shared/GV. Once I've done that, my base class is accessible anywhere in Zope. Cool. Now I just need to register it as a base for ZClasses. So, I make a directory lib/python/Products/MyProduct. In this directory, I put an __init__.py with: import MyBasePythonClass def initialize(context): context.registerBaseClass(MyBasePythonClass.MyBasePythonClass) So, now my class is available as a base class for my ZClass. Now, it's time to make the ZClass. But, where? Is it considered bad form to add it in the MyProduct product (a "closed box" product)? Should I make another product, an "open box" one through the Control Panel, called MyProduct2 and make my ZClass in there? If that's the case, I might as well take MyBasePythonClass out of lib/python/Shared/GV and put it in a "closed box" product called MyProductBase, and then make the ZClasses in the "open box" MyProduct. Boy, that was a mouthful. :) Basically, it all boils down to: Of those of you who are using Python base classes for your ZClass, how are you structuring your product/directory tree? --Jeff --- Jeff K. Hoffman 704.849.0731 x108 Chief Technology Officer mailto:jeff@goingv.com Going Virtual, L.L.C. http://www.goingv.com/

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RE: [Zope] WebDAV, Zope object locking
by Michel Pelletier 20 Jan '00

20 Jan '00

> -----Original Message----- > From: Hung Jung Lu [mailto:hungjunglu@hotmail.com] > When several people are working on the same site, > what is the current approach in preventing two > people modifying the same object? Lock the object in a version so that the user who is not currently logged into the version gets an error when they try to modify the object. > --------------------------------------------- > > I have seen the buzzword WebDAV here and there. > I have visited the http://www.webdav.org/ site, > but I am still clueless as what it is. It WebDAV > still under intense development? Yep. > Does Zope support > WebDAV now? Yep. > Is WebDAV just a protocol extension > to HTTP, Yep. > so people are still talking to each other > on how to shape up this protocol? Yep. > For developers > and content managers, what software do we need to > install to use WebDAV? Just Zope, and a good client (I don't know of any off hand). > When the Zope people talk about a "Zope WebDAV > Test Server", are they referring to > > (1) A downloadable software package, or No. > (2) A physical server machine, much like a website > where you can create accounts for people so they > can help to develop the eventual server software? Yep. http://webdav.zope.org/ -Michel

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