September 2000 - Zope

<dtml-comment> doesn't?
by Chris Withers 08 Sep '00

08 Sep '00

Hi, Is is just me or does stuff inside a <dtml-comment> get parsed? So if you have: <dtml-comment> ... some syntactically bad dtml ... </dtml-comment> You still can't save the page 'cos the the parser throws up an error. That seems silly to me. Anyone else agree? cheers, Chris

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ZClass for PDFs
by Timothy Wilson 08 Sep '00

08 Sep '00

Hi everyone, I'd like to make a large number of PDF files available for download from my site. HTML versions of the files will also be available for online viewing. I could certainly include the PDF files as regular file objects or I could create a ZClass specifically for PDF files. I suspect that this question may be of general interest, so I'm asking for comments about the pros and cons of either approach. -Tim -- Tim Wilson | Visit Sibley online: | Check out: Henry Sibley HS | http://www.isd197.k12.mn.us/ | http://www.zope.org/ W. St. Paul, MN | | http://slashdot.org/ wilson(a)visi.com | <dtml-var pithy_quote> | http://linux.com/

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Zclass not reindexing (it is CatalogAware)
by Tim Hicks 07 Sep '00

07 Sep '00

I have created a Zclass, the the _ZClass_for_CatalogAware base class as the first added base class (second in the list of base classes). My zcatalog (named Catalog) is set to 'Find objects of type: "myClass_metatype"' and therefore, when I add a new instance of my class, it is automatically added to the catalog. By that, I mean that once I have added the instance, I can go the the 'Cataloged Objects' view and see it listed there. However, if I try a search using the raw (TextIndex) search outlined in one of the tutorials, the search fails to find words that I *know* are in the zclass that I just added, and that I thought had been cataloged. Clicking on 'Update Catalog' in the 'Cataloged Objects' view and then researching means that the search succeeds in finding the word in the new instance. The question is, do I need to add the equivalent of what is written in 'How-To: Creating a CatalogAware ZClass' for reindexing zclass properties, but for reindexing the actual text? How could I do this? <extract from 'How-To: Creating a CatalogAware ZClass'> <dtml-call "propertysheets.InstanceConstants.manage_changeProperties(REQUEST)"> <dtml-call reindex_object> </extract from 'How-To: Creating a CatalogAware ZClass'> Help much appreciated, tim

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Re: [Zope] Zope 2.2.1 Solaris 8 dumps core
by Fredrik Aronsson 07 Sep '00

07 Sep '00

Hello! I've had a similar problem, with Zope coredumping, but since I recompiled python using the same compiler that I compiled Zope with, Zope works correct. /Fredrik Aronsson (I've included the smallest script I could find that dumped core. If it dumps core for you too, perhaps you have the same problem.) #!/usr/local/bin/python -u import sys sys.path.append('/www/zope/lib/python') print "Content-type: text/plain" print print "Everything OK!" import ExtensionClass print "Still ok!" > > Hi > > I've downloaded the src of Zope 2.2.1 on my UltraSparc running Solaris > 8, built it ok, but when I try run ./start it it dumps core with a > segmentation fault. > Is this problem known? Anything I can do? > I am completely new to both Python and Zope ... > > > Thanks > Michele >

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Editing of ZClasses using FTP: Access denied
by Harald Koschinski 07 Sep '00

07 Sep '00

Hallo, I am trying to edit methods inside a ZClass. The problem is, that the ZClasse-folder don´t has any permissions via FTP - so there is no chance to come into the folder. Where do I have to change the permission?? Help is really appreciate Thanks Harald

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RE: [Zope] Python, persistent objects and caching
by Dieter Maurer 07 Sep '00

07 Sep '00

Brian Lloyd writes: > Soren Rough writes > > ... application level cache ... > > ... application objects flushed (including cache) > One approach would be to cache your data in the module's > namespace. For ex: > > mycache={} > > class MyClassThatKeepsGoingAway: > ... > def get_data(self, id): > if mycache.has_key(id): > return mycache[id] > else: > ... > > Note that my example is a little contrived, since using a module > variable means that you will have to implement this in a way that > is safe for a multi-threaded environment. You can use a "SharedResource" for this: URL:http://www.dieter.handshake.de/pyprojects/zope/SharedResource.html Dieter

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Re: [Zope] Proxy roles don't propagate? - bizzare permissions from ZDChart too
by Dieter Maurer 07 Sep '00

07 Sep '00

Brad Clements writes: > ... Proxy role does not propagate ... This has been changed starting with Zope 2.2. The callee no longer inherits the proxy role from its caller but must get its own proxy role. Dieter

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Re: [Zope] Lock and Transaction in Zope.
by Dieter Maurer 07 Sep '00

07 Sep '00

Aitor Grajal writes: > --=====_9682482706334=_ > Content-Type: text/plain; charset="ISO-8859-1" > Content-Transfer-Encoding: quoted-printable I hate "multipart" or encoded messages to this list (because the digest removes MIME headers (what a stupidity!) and does not give my mail reader a chance to decode them). > ... two requests concurrently accessing the same object ... > The first one crashes, and doesn't finish right.... > I want to know if there is any way to lock ... > about locking resources in Zope. You do strange things... Zope tries hard to avoid locking and uses an optimistic collision policy instead. Several threads can run concurrently on separate copies of an object. If, during commit, a collision is detected, the affected transaction is aborted and (I think I read that) restarted. If you really need locking, you can use Pythons "threading" module (in a package used from an external method). You must be careful, though. Look in the archive for a message from Sean McGrath about the potential problem involved and my reply for a solution. You may also look (as an example) at URL:http://www.dieter.handshake.de/pyprojects/zope/SharedResource.html It uses looks to protect resources shared by several threads. Dieter

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DTML Question on lines
by Coleman, Bryan 07 Sep '00

07 Sep '00

I am trying to itterate through a lines property in the folder so that the options will drop down. I did not think that the following code would work but I could not think of anything else. <dtml-in valid_codes> <option value="<dtml-var valid_codes>"><dtml-var valid_codes> </option> </dtml-in> - Bryan Patrick Coleman Questcon Technologies (336)273-2428 ext-416 bcoleman(a)questcon.com

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Re: [Zope] OSError along with FSSession...
by Dieter Maurer 07 Sep '00

07 Sep '00

Chien-Pin Wang writes: > Zope complains an error type "OSError" and throws the error value > saying [Errno 21] Is a directory: '/usr/local/zope/var/FSSession/' > occasionally since a recent upgrade of FSSession product to 0.4.2. > Following that error will be a series of TransactionErrors for each and > every request Zope received. And only a zope restart could help zope > resume its operations. Since this error only comes up occasionally, I'm > completely clueless on solving it. > .... > File /usr/local/zope/lib/python/Products/FSSession/FSSession.py, line > 208, in > final_commit > (Object: FSSession) > OSError: [Errno 21] Is a directory: '/usr/local/zope/var/FSSession/' Maybe, a bug in "FSSession.final_commit". Look at line 208 of "FSSession.py". I expect some lines before, a filename is constructed for the above directory and session specific data. For some reason, the session specific data leads to an empty filename. Therefore, the operation in line 208 (probably an "os.rename" or other "os" operation) gets the directory rather than a file path. You have two options: * analyse, why the session data leads to an empty filename (this may be difficult) * add a try: ... except: pass around line 208 and wait for the FSSession author to analyse and fix the problem. Dieter

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