November 2000 - Zope

ZClasses on top of my Python classes?
by Randall Kern 16 Nov '00

16 Nov '00

I've seen several doc tidbits suggesting one create ZClasses derived from their Python classes, sticking all the biz logic in the python classes, and the presentation in the ZClasses... Could someone provide some insight into why this is better than simply writing separate python classes for logic and presentation? (Although I have to admit hitting the "Restart Server" button every time I make a typo is getting old) Thanks! -Randy

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chapter 5 Zope book - problems with the examples
by Lee Reilly CS1997 16 Nov '00

16 Nov '00

Hi, I'm going through the examples in Chapter 5 of the Zope book and am having some problems. For those of you familiar with it, it is the 'Zope Zoo' example. Can anyone help me out? 1 - I create a DTML method called navigation as follows: <ul> <dtml-in expr="objectValues('Folder')"> <li><a href="&dtml-absolute_url;"><dtml-var title_or_id></a> </li> </dtml-in> </ul> 2 - On viewing this method it works fine - a hyperlink to all sub-folders appears in the browser. 3 - I add '<dtml-var navigation>' into my standard_html_header so it reads: <html> <head> <title>ZAPHOD - zopetastic!</title> </head> <body bgcolor="#FFFFFF" LINK="#000099" VLINK="#555555"> If your name is Lee then click <a href="manage">here</a> to login. <dtml-var navigation> 4 - On viewing index.html (containing header & footer) everything except the navigation method appears. Viewing the source of index.html reveals that the <ul> tags are created... just no <li> elements. 5 - The HTML is fine... all tags closed & in te right place. Can anyone see a problem? Thanks in advance for any replies. My appologies also for such a long post. - Best regards, Lee Reilly

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RE: [Zope] chapter 5 Zope book - problems with the examples
by Max Møller Rasmussen 16 Nov '00

16 Nov '00

You have an aquisition/namespace problem. If <dtml-var navigation> is used in a document like an index_html dtml-document, It tries to find the objecValues in that document. But a document is not a folder. So the list will be empty. So is your index_html a document or method? Try changing it to a method, as a method doesn't have it's own namespace and will look in the nearest aquired namespace. Hopefully a folder. Or use a more direct approach bu telling what folder you want to see objectValues from. <dtml-in expr="someFolder.objectValues('Folder')"> <li><a href="&dtml-absolute_url;"><dtml-var title_or_id></a> </li> </dtml-in> Regards Max M -----Original Message----- From: Lee Reilly CS1997 [mailto:lreilly@cs.strath.ac.uk] Sent: Thursday, November 16, 2000 2:41 PM To: zope(a)zope.org Subject: [Zope] chapter 5 Zope book - problems with the examples Hi, I'm going through the examples in Chapter 5 of the Zope book and am having some problems. For those of you familiar with it, it is the 'Zope Zoo' example. Can anyone help me out? 1 - I create a DTML method called navigation as follows: <ul> <dtml-in expr="objectValues('Folder')"> <li><a href="&dtml-absolute_url;"><dtml-var title_or_id></a> </li> </dtml-in> </ul> 2 - On viewing this method it works fine - a hyperlink to all sub-folders appears in the browser. 3 - I add '<dtml-var navigation>' into my standard_html_header so it reads: <html> <head> <title>ZAPHOD - zopetastic!</title> </head> <body bgcolor="#FFFFFF" LINK="#000099" VLINK="#555555"> If your name is Lee then click <a href="manage">here</a> to login. <dtml-var navigation> 4 - On viewing index.html (containing header & footer) everything except the navigation method appears. Viewing the source of index.html reveals that the <ul> tags are created... just no <li> elements. 5 - The HTML is fine... all tags closed & in te right place. Can anyone see a problem? Thanks in advance for any replies. My appologies also for such a long post. - Best regards, Lee Reilly _______________________________________________ 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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Zope good for multiprocessor hardware
by Andreas Tille 16 Nov '00

16 Nov '00

Hello, we intent to buy new web server hardware. We want to run Debian GNU/Linux on a Sun system. I wonder if zope could profit from a multi-processor architecture on such a system. Zope server starts several threads. So could they be split over the different processors automatically, can I enforce it or is it not possible. Kind regards Andreas.

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Transaction sizes
by Paul Zwarts 16 Nov '00

16 Nov '00

Hi all, I have a few forms that really work intermitently. They are quite large in processing, accessing several thousand occurences in several tables, several times. Wont go into details, but its a resource hog. Alot of times the page eventually returns a No data error. This causes me to wonder if there are some kind of restraints on Zope in terms of its job size. Are there any tweaks to zope that I can fix this, or is it directly related to the resources of the server? Anyone with an idea? TIA, -- Paz Oratrix Development BV http://www.oratrix.com GRiNS SMIL Editor -

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Dr.Watson on NT
by J�lio Dinis Silva 16 Nov '00

16 Nov '00

Hi all, Is there a NT guru in the house :-) Zope 222 Sometimes Zserver goes Zombie, I login on the machine and I see a DrWatson Window. I close DrWatson window and the process automagically restarts, and everything ok. Whenever this happens two logs are written in EventLogger: -one is a Warning: Restarting Zope... -one is a Info: starting Zope... With a couple of seconds of distance in time between them. I can see something is puting ZServer zombie and I'm looking at debug to find the sucker method :-) but this DrWatson behaviour never seen by me before: could be Zope doing a Zombie Timeout and restarting himself? If yes why does he hangs and only by closing the DrWatson Window the python.exe process really restarts? Any comments, tips, Dr.Watson Guru? Best Regards, Júlio Dinis Silva _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.

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using if with date values
by Herring, William O. 16 Nov '00

16 Nov '00

I would like to insert into the this sql table the form variable birth.x. I would like to do it only if the date variable identification.birthdate is greater the that listed below. I know the current 'if' statement is incorrect and probably not even close. However, I haven't been able to find any documentation. Any ideas or solutions would be appreciated.  INSERT INTO inventory (x) VALUES (  )

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the Parsed XML project
by Karl Anderson 16 Nov '00

16 Nov '00

The Parsed XML project is now public and ready for input. Parsed XML is the successor to XMLDocument. We have a wiki at <http://www.zope.org/Wikis/DevSite/Projects/ParsedXML>. zope-xml(a)egroups.com is also a good place for discussion at this time. -- Karl Anderson karl(a)digicool.com

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RE: [Zope] ZClasses on top of my Python classes?
by Max Møller Rasmussen 16 Nov '00

16 Nov '00

From: Randall Kern [mailto:randy@teamkern.net] >I've seen several doc tidbits suggesting one create ZClasses derived from their >Python classes, sticking all the biz logic in the python classes, and the >presentation in the ZClasses... >Could someone provide some insight into why this is better than simply writing >separate python classes for logic and presentation? (Although I have to admit >hitting the "Restart Server" button every time I make a typo is getting old) Well one thing is that it clearly separates logic from presentation, and if you know zClasses it is easier to get started with while stille being nice to program in Python. You can reuse the same Python logic and give it several different interfaces in several zClasses. Regards Max M

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modifying objectValues from an external method?
by Bowyer, Alex 16 Nov '00

16 Nov '00

You may remember I have posted a couple of times about problems I have had with manage_delObjects to delete a news article object from a news page which contains several child news article objects. I thought I would try and avoid the problem and make a Python method to remove the item. This method takes the list of articles (i.e. objectValues) and does the deletion on the parameter passed in. The problem I have is, objectValues doesn't seem to exist at Python level, only at DTML level. So instead of: <dtml-call "my_delete_function(objectValues)"> which is not valid, I have to use: <dtml-let my_list=objectValues> <dtml-call "my_delete_function(my_list)"> </dtml-let> The problem with this is that even though the parameter is passed by reference, the changes are only being done to my_list and not passed back to objectValues. So I lose them once my_list is out of scope. Can anyone suggest an alternative or a workaround? I thought about returning the modified list from the function, but DTML provides no functionality to set objectValues equal to this result. Any help would be appreciated! Thanks Alex ================================== Alex Bowyer IT Contractor, 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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