April 2001 - Zope-Dev

.zexp format deprecated?
by Michael R. Bernstein 05 Apr '01

05 Apr '01

Hi all, Someone just mentioned on the #zope IRC channel that they saw a comment to the effect that the 'zexp format was 'deprecated'. Can anyone confirm this? what release will no longer support the format? Michael Bernstein.

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RE: [Zope-dev] MySQL-python-0.3.5 with ZMySQLDA
by Mike Blake 04 Apr '01

04 Apr '01

>>> Traceback (innermost last): >>> File C:\zopes\chikoon\lib\python\OFS\Application.py, line 536 in import_products >>> (Object: string) >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\__init__.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\DA.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\db.py, line 89, in ? sorry, but I forgot to include the last line of the message: >>> ImportError: No module named _mysql -- [morcilla(a)ketden.com chikoon]$ whoami ------------------------------------------------------------ [whoami] >> Mike Blake >> Web Developer / CellNetwork, Spain [e-mail] >> mike.blake(a)cellnetwork.com [icq] >> 103631268 [mobile] >> 678 642 392 [direct office phone] >> 91 761 4913 [office] >> Plaza Alonso Martinez 3, 4ª Planta, 28004 Madrid ------------------------------------------------------------ -----Original Message----- From: Mike Blake Sent: miércoles, 04 de abril de 2001 18:50 To: Zope-Dev (E-mail) Cc: 'Phil Harris' Subject: RE: [Zope-dev] MySQL-python-0.3.5 with ZMySQLDA mike wrote: >> I just tried a build of the MySQL-python-0.3.5 module and >> I get a file not found error because I don't have a cl.exe, >> which is apparently something I need to finish the build. >> Does anyone know what I'm missing? >> I have Python 2.0 and MySQL 3.23.33 on win2000 phil wrote: > You need Microsoft Visual C (6.x?) to compile what you want. Ok, I installed Microsoft Visual C++ from Studio 6, and after I did a successful build and install of the setup.py file for the MySQL-python-0.3.5 I installed it in a folder in my python directory: C:\Python20\win32comext\MySQL-python-0.3.5 But the reason I was compiling this module is because it is required for the installation of the ZMySQLDA database adaptor. >>> Installation >>> >>> The Z MySQL database adapter uses the MySQLdb package. >>> This must be installed before you can use the Z MySQL DA. >>> Instructions on building the extension modules are given in the >>> the README.txt file in the source directory. Ok, I got this far, but I extract the ZMySQLDA to the <zope-root>/lib/pyton/products directory, and the product doesn't install properly. It appears broken in the products list. Here is the error it gives on startup: >>> Traceback (innermost last): >>> File C:\zopes\chikoon\lib\python\OFS\Application.py, line 536 in import_products >>> (Object: string) >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\__init__.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\DA.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\db.py, line 89, in ? Any ideas??? Is there something else besides the MySQLdb that I must compile for the product to be successfully installed? Thanks, mike -- [morcilla(a)ketden.com chikoon]$ whoami ------------------------------------------------------------ [whoami] >> Mike Blake >> Web Developer / CellNetwork, Spain [e-mail] >> mike.blake(a)cellnetwork.com [icq] >> 103631268 [mobile] >> 678 642 392 [direct office phone] >> 91 761 4913 [office] >> Plaza Alonso Martinez 3, 4ª Planta, 28004 Madrid ------------------------------------------------------------

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REQUEST and values stored there
by Morten W. Petersen 04 Apr '01

04 Apr '01

Hia guys, the recent changes to the HTTPRequest class breaks some of my code. I may have missed some notifications, but why wasn't this made clear as it could obviously break code? -Morten

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RE: [Zope-dev] MySQL-python-0.3.5 with ZMySQLDA
by Mike Blake 04 Apr '01

04 Apr '01

mike wrote: >> I just tried a build of the MySQL-python-0.3.5 module and >> I get a file not found error because I don't have a cl.exe, >> which is apparently something I need to finish the build. >> Does anyone know what I'm missing? >> I have Python 2.0 and MySQL 3.23.33 on win2000 phil wrote: > You need Microsoft Visual C (6.x?) to compile what you want. Ok, I installed Microsoft Visual C++ from Studio 6, and after I did a successful build and install of the setup.py file for the MySQL-python-0.3.5 I installed it in a folder in my python directory: C:\Python20\win32comext\MySQL-python-0.3.5 But the reason I was compiling this module is because it is required for the installation of the ZMySQLDA database adaptor. >>> Installation >>> >>> The Z MySQL database adapter uses the MySQLdb package. >>> This must be installed before you can use the Z MySQL DA. >>> Instructions on building the extension modules are given in the >>> the README.txt file in the source directory. Ok, I got this far, but I extract the ZMySQLDA to the <zope-root>/lib/pyton/products directory, and the product doesn't install properly. It appears broken in the products list. Here is the error it gives on startup: >>> Traceback (innermost last): >>> File C:\zopes\chikoon\lib\python\OFS\Application.py, line 536 in import_products >>> (Object: string) >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\__init__.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\DA.py, line 91, in ? >>> File C:\zopes\chikoon\lib\python\Products\ZMySQLA\db.py, line 89, in ? Any ideas??? Is there something else besides the MySQLdb that I must compile for the product to be successfully installed? Thanks, mike -- [morcilla(a)ketden.com chikoon]$ whoami ------------------------------------------------------------ [whoami] >> Mike Blake >> Web Developer / CellNetwork, Spain [e-mail] >> mike.blake(a)cellnetwork.com [icq] >> 103631268 [mobile] >> 678 642 392 [direct office phone] >> 91 761 4913 [office] >> Plaza Alonso Martinez 3, 4ª Planta, 28004 Madrid ------------------------------------------------------------

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BTree upgrading
by Chris Withers 04 Apr '01

04 Apr '01

Hi, I see the new catalog stuff makes use of new BTrees. I presume the big advantages the new catalog has are from these new BTrees. I know of a few products which also use these BTrees (Squishdot and some internal ones here spring to mind) so I guess they should be upgraded too? Well, I had a look at the _convertBTrees method in Catalog.py and it all made sense, so I'm guessing the folowing would be the correct way to convert some BTrees? from BTrees import IOBTree, BTree, convert myBTree if type(myBTree is not IOBTree): mynewBTree = IOBTree() convert(myBTree,mynewBTree, 200) ...or.. if type(myBTree is not BTree): mynewBTree = BTree() convert(myBTree,mynewBTree, 200) I'm guessing the 200 is how many items get put in each bucket? What should influence the choice of this number? cheers, Chris

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cl.exe with MySQL-python-0.3.5
by Mike Blake 04 Apr '01

04 Apr '01

Hi! I just tried a build of the MySQL-python-0.3.5 module and I get a file not found error because I don't have a cl.exe, which is apparently something I need to finish the build. Does anyone know what I'm missing? I have Python 2.0 and MySQL 3.23.33 on win2000 Thanks, mike -- [morcilla(a)ketden.com chikoon]$ whoami ------------------------------------------------------------ [whoami] >> Mike Blake >> Web Developer / CellNetwork, Spain [e-mail] >> mike.blake(a)cellnetwork.com [icq] >> 103631268 [mobile] >> 678 642 392 [direct office phone] >> 91 761 4913 [office] >> Plaza Alonso Martinez 3, 4ª Planta, 28004 Madrid ------------------------------------------------------------

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Form error handling for Rack-stored PD classes in O-O application
by Itai Tavor 04 Apr '01

04 Apr '01

Hi, I often have more luck the second time I ask a question... let's see if this rule holds. I'm struggling with checking and reporting errors in forms that create or modify properties of PD classes in a ZPatterns application. Automatic checks using Zope's built-in constraints or something like ValueHandler won't cut it, because they can't cover all the required rules - for example, checking if a Product SKU is being set to an existing SKU, or that a Customer is trying to use an email address already in use (and also because I want to return the form page with the errors indicated, rather than a generic error page). So I need a specific verification method for each class. This method will be used both when an object is edited and when its created. To use the method when creating an object, I either have to place it in the Specialist - which is bad, because the PD class should provide its validation code, or call it at commit time, using a SkinScript WHEN OBJECT CREATED,CHANGED clause. But verification methods called at commit time do their checks on the object properties, not on any submitted form field values. So they can test that a password is reasonably secure, but can't check that passwords typed in two form fields are identical. One thing I can do is define a editInstance method which would verify the values in REQUEST.form and then call manage_changeProperties, or store a list of errors in the REQUEST and raise a 'FormError' exception. But I can't let this exception propagate freely, I have to catch it so I can display an appropriate error page. Also, if a form results in the creation of more than one object, I want to display all the errors that result from the creation of all the objects, but if the first object raises an exception, I can't create the second one (especially if the second one expects to get the id of the first). Or I could forget about exceptions and simply return an error list from editInstance. Then it would be up to the method calling editInstance to raise an exception to roll back the created objects. This is the only workable solution I got at the moment... I can get it to work, but I've chased solutions in the past that seemed good but ended up crashing... so I'd really appreciate any comments on possible flaws or problems I'm not seeing, or any other, better solutions. This is what it would look like (just an example, not showing cases where more complex stuff happens, like 2 objects being created with a single form): In Customer (DataSkin PD class): def editInstance(self, REQUEST, errors): err = self.verify(REQUEST) if err != {}: errors.update(err) else: self.manage_changeProperties(REQUEST) def editInstance_html(self, REQUEST, RESPONSE): """Action method for editInstanceForm_html""" errors = {} self.editInstance(REQUEST, errors) if errors != {}: html = self.editInstanceForm_html(self, REQUEST, errors=errors) raise 'FormError', html RESPONSE.redirect('editInstanceForm_html?message=Changes%20saved.') def verify(self, REQUEST): errors = {} if REQUEST['name'] == '': errors['name'] = 'Please provide a name' return errors In CustomerManager (Specialist): addCustomer(self, REQUEST, errors): ni = self.defaultRack.newItem() ni.editInstance(REQUEST, errors) return ni addCustomer_html(self, REQUEST, RESPONSE): """Action method for addCustomerForm_html""" errors = {} ni = self.addCustomer(REQUEST, errors) if errors != {}: html = self.addCustomerForm_html(self, REQUEST, errors=errors) raise 'FormError', html RESPONSE.redirect('manageInstances_html?message=New%20customer%20created.') And, of course, I can also have WHEN OBJECT ADDED,CHANGED CALL self.ensure_valid(), to catch anything that might get by the above checks. ensure_valid will raise its own error page, independent of the above. TIA for any help/comments Itai -- -- Itai Tavor -- "Je sautille, donc je suis." -- itai(a)optusnet.com.au -- - Kermit the Frog -- -- 'Supposing a tree fell down, Pooh, when we were underneath it?' -- -- 'Supposing it didn't,' said Pooh after careful thought. --

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Bizarre Version Behavior
by Edmund Goppelt 03 Apr '01

03 Apr '01

I'm worried that versioning is not working properly on my Zope 2.3.0 web site. Since my site is due to receive some major publicity, the flakiness of versioning worries me a good deal. I'm hoping some of the more experienced developers can advise me on whether I should continue to use versioning and/or whether I have a corrupt ZODB. What has been your experience with Versions? Is this a reliable feature of Zope? Here's what happened: I recently committed a Version to the ZODB, but Zope showed many of the objects as still having uncommitted changes (the red diamond). Further, Zope showed many items as having changed that I know for a fact I did not edit (mainly Python scripts). Worst of all, the site became inaccessible to users, with Zope responding to page requests with a VersionLockError. Thankfully, Zope seems to have committed the changes after I saved the Version changes a *second* time, but the fact that Zope got so confused about what had changed makes me reluctant to use versioning in the future. -- Ed Goppelt

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Re: [Zope-dev] ZPatterns Image Archive Project
by Michael R. Bernstein 03 Apr '01

03 Apr '01

"Phillip J. Eby" wrote: > > At 05:27 PM 3/30/01 -0800, Michael R. Bernstein wrote: > >Now I am working on a ArchiveImage ZClass that holds 'meta' > >information about an image, such as the description, a date, > >and keywords. > > > >I want to have one Rack for each image size that I want to > >store. > > Just out of curiousity, why do you want seperate racks for each size? Are > they being stored in different ways or have different behavioral > requirements (e.g. different classes) apart from their size? If not, there > is probably no reason to have multiple racks. Well, I want to store several versions of each image. Let's take a simplified case where I want the original image and a thumbnail, both of which need to appear as subobjects of the ZClass with the meta-data. If I store all the RackImages (originals and thumbnails) in one Rack, how do I differentiate between them, so that '/Archive/001/thumbnail' and 'Archive/001/original' show the appropriate images? It just seemed simpler to create a 'thumbnail' Rack and an 'original' Rack. > >I realize that I need to tie the Racks together in the > >specialist using SkinScripts > > SkinScript doesn't do anything to tie racks together or to a Specialist - > it's just a way of describing where the data comes from/goes to for a > particular Rack. That's what I meant, sorry. The RackImages need to appear to be attributes of the ZClass, and I'll use SkinScripts to accomplish that. > >Where do I put the separate Racks? do I create a specialist > >for each Rack (seems unneccessary) or do I put several Racks > >in the same Specialist? > > Several in the same, if they are providing objects which fill the same role > in your overall application. And do the RackImages Racks go into the same Specialist as the ZClass Rack? > >The DTML I am using to instantiate RackImages in the Rack > >for example, is as follows: > > > ><dtml-let ni="newItem(REQUEST.id)"> > > <dtml-call "ni.manage_edit(REQUEST.title,'')"> > > <dtml-call "ni.manage_upload(REQUEST.file)"> > ></dtml-let> > > > >But this code only works for a Rack named defaultRack, which > >I can obviously only have one of. > > Just use the name of the rack, e.g.: > > <dtml-let ni="rackOne.newItem(REQUEST.id)">, etc. Ok, thanks! That works (Duh). Michael Bernstein.

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Homegrown vs. Storebought
by Edmund Goppelt 03 Apr '01

03 Apr '01

I'd like to add two capabilities to my city government web site: 1. users should be able to initiate discussions about legislation pending before our City Council. i.e., discussions will be tied to the relevant bill document. 2. users must register in order to post. I'd like enough information so that if someone posts death threats or the like they can be tracked down. I don't need threaded discussions (though that would be nice) so I'm tempted just to roll my own. Is there anything out there in the way of easy to use discussion Products that I could pop in to my site without buying into a gigantic set of associated machinery a la CMF? As far as enforcing some minimal accountability on the part of posters, the Membership product seems like my best bet, though there are some things I'd like to change, e.g., I'd like user info stored in a SQL db, not Zope, passwords should not be encrypted 'cause I want to send them out every month, and I want different info. stored about users than the default properties provided by the Product. How hard do you think this would be with Membership? Are there any other Products I should consider IYO? Thanks! -- Ed Goppelt

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