July 2000 - Zope-Dev

Re: [Zope-dev] Re: zpatterns-0.4.0a5: problemwithunregistering transactionals
by Jephte CLAIN 27 Jul '00

27 Jul '00

> Okay, that makes sense. 2.1.6 has a weirdness in the ZPublisher exception > hook that begins a new transaction instead of aborting the old one cleanly, I did notice this. > and that ultimately causes the objects to get aborted twice. I reported > this a month or two ago and it got fixed in 2.2. rahhh, is Zope 2.2 the only way to go? :-) > You're going to have to > go with your patch, though, because there's not a simple patch you can > apply to 2.1.6 to fix the problem in Zope itself. Unfortunately, it is > hard for me to tell whether your patch has any other repercussions. :( I > will try to review the structure of my Transactional class and see if there > are any side effects (besides the one you've found) of an object being > aborted twice. Thanks a lot. By the way, besides new features like skinscript and proxy settings, did you fix any bugs from 0.4.0a5 in 0.4.1a5 that would make me have to upgrade my current ZPatterns? regards, jephte.clain(a)univ-reunion.fr

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Interaction between new (2.2) ZCatalog and Renderable
by Jeff Sasmor 27 Jul '00

27 Jul '00

Hi Zdevs, I posted a message to Zope(a)Zope.org and then later figured out the problem and now feel that the issue belongs in Zope-Dev, so here it goes. Submitted for your approval... I think that I have found an interaction between changes made in manage_addZCatalog (lib/python/Products/ZCatalog/ZCatalog/py) and the Renderable ZClass product. It's also possible that this interaction will affect other things as well. The new version of method 'manage_addZCatalog' has calls to str() near its beginning. The older (2.1.6) does not. The Renderable product overrides str to do its work. This gets _very_ messy when you initialize a catalog in the xxx_add dtml method for a ZClass (that is, if you create an instance of the ZClass and the _add method instantiates a ZCatalog instance.) and the ZClass itself is renderable. The manage_addZCatalog method ends up invoking the str() method that's in the Renderable product. This code attempts to publish(?) the a dtml method named render (this is what it does by default). In my case, the dtml method tries to query the created ZCatalog instance. This does not work! since the ZC instance isn't actually created since the _add method has not completed(?). So the render dtml method borks with an attribute error. Correct me if I have reverse-engineered these conclusions from looking at the traceback and made a logic error.... As one can see from the traceback attached to the end of this email, the manage_add methof (I put XXXXX near where this mess begins) warps into the render dtml method at line 112 of manage_addZCatalog, which is the first str() (can be seen in the src). This ends up in an External Method, rendercal.py (last line of traceback). If you were to look there you'd se that it's doing a Catalog.searchResults(). **SO** it appears as if you cannot instantiate a ZCatalog in the _add dtml method of a ZClass IFF the ZClass inherits from Renderable AND if the render dtml method of the class (required by Renderable) uses the ZCatalog. This interaction may very well affect other products as well. But right now my brain hurts. Excuse me if someone else reported this, but I haven't seen mention of it so far. This should be easy to reproduce. On a 2.2 system that has the Renderable ZClass product installed, install EventFolder (it's on Zope.org, there's a .zexp and some External Methods in the tgz file, just untar it in the Zope root and copy the .zexp to the import dir and import it). Try to create an instance and you should get this error. It seems to me the only solution is to recreate the class without the Renderable inheritance. Not a big deal to lose.... But what other schizoZopia is waiting in the future..... Jeff Sasmor jeff(a)janix.com Traceback (innermost last): File /usr/local/Zope220/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/Zope220/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/Zope220/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: RoleManager) File /usr/local/Zope220/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/Zope220/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: EventFolder_add) File /usr/local/Zope220/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: EventFolder_add) File /usr/local/Zope220/lib/python/OFS/DTMLMethod.py, line 167, in __call__ (Object: EventFolder_add) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: EventFolder_add) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_Let.py, line 147, in render (Object: folder="EventFolder.createInObjectManager(REQUEST['id'], REQUEST)") File /usr/local/Zope220/lib/python/DocumentTemplate/DT_With.py, line 146, in render (Object: folder) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_Util.py, line 337, in eval (Object: manage_addProduct['ZCatalog'].manage_addZCatalog(this(),'Catalog','EventCatalog' )) (Info: this) File <string>, line 0, in ? XXXXXXXXXXXXXXXX it begins File /usr/local/Zope220/lib/python/Products/ZCatalog/ZCatalog.py, line 112, in manage_addZCatalog ????????????how did we get here vvvvvvvv File /usr/local/Zope220/lib/python/Products/Renderable/Renderable.py, line 17, in __str__ (Object: Renderable) File /usr/local/Zope220/lib/python/OFS/DTMLMethod.py, line 167, in __call__ (Object: render) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: render) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_With.py, line 146, in render (Object: ZopeTime) File /usr/local/Zope220/lib/python/DocumentTemplate/DT_Let.py, line 147, in render (Object: tdate="'%s/%s/1' % (tyear,tmonth) " this_month="'%s/%s' % (tyear,tmonth) " ddate="_.DateTime(tdate)") File /usr/local/Zope220/lib/python/DocumentTemplate/DT_Let.py, line 147, in render (Object: smeth="dateSearch.absolute_url()") File /usr/local/Zope220/lib/python/DocumentTemplate/DT_Util.py, line 337, in eval (Object: renderMonth(ddate,smeth,bodyFgColor,bodyBgColor,headingFgColor,headingBgColor, 'showyear' , moderated)) (Info: smeth) File <string>, line 0, in ? File /usr/local/Zope220/lib/python/Products/ExternalMethod/ExternalMethod.py, line 270, in __call__ (Object: renderMonth) (Info: ((DateTime('2000/07/01'), 'http://www.ptang.com/test/sss/dateSearch', '#000000', '#ffffff', '#ffffff', '#000000', 'showyear', 'on'), {}, None)) XXXXXXXXXXXXXXX Arrgh! File /usr/local/Zope220/lib/python/Products/EventFolder/Extensions/rendercal.py, line 97, in renderMonth (Object: Renderable) AttributeError: (see above) Zope Error Zope has encountered an error while publishing this resource. Error Type: AttributeError Error Value: Catalog

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Re: [Zope] Bi-directional update of Data.fs
by chrisw 27 Jul '00

27 Jul '00

Bill Anderson wrote: > Since the Data.fs is appended to, and that your disconnected version is > canonical, why couldn't you basically look for the last common > transaction, and append all transactions in the canonocial to the main > one? Hwo would that handle the situation where an object has been modified in data.fs? Not too well I'd guess... :( > (thinking this might need to be moved to dev ...) And so it was ;-) cheers, Chris

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Visual studio compilation ....
by * Lucky 27 Jul '00

27 Jul '00

I'm trying to tweak Splitter.c in order handle french specific characters. It seems to work fine with gcc under Linux but it doesn't work with MS Visual C. Even compiling the original source code under windows results in a different module behaviour. Which compiler is required to compile Splitter.c under Windows ? If any, could you send me the project file ? _______________________________________________________ Vendez tout... aux enchères - http://www.caraplazza.com

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Re: [Zope-dev] Re: zpatterns-0.4.0a5: problem withunregistering transactionals
by Jephte CLAIN 27 Jul '00

27 Jul '00

"Phillip J. Eby" a écrit : > > Question... Are you on 2.1.x or 2.2? I'm still on 2.1.6. I cannot afford a migration of my product now since it is still in developpement and my customer wants it to work as soon as possible. > Also, in your example, tpc_entered > is not set because tpc_entered is only true if the transaction commit > process (tpc = two-phase commit) has been started. I thought that tpc_entered would go back to 0 when the transaction is over. It is clear that I don't know how the transaction machinery really works. regards, jephte.clain(a)univ-reunion.fr

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Quickie on ZPatterns ... I promise :)
by Bill Anderson 27 Jul '00

27 Jul '00

Let's say I have an object I will store in a rack. Let us say I want this object to be cataloged in a ZCatalog. Any caveats I need to know about ..such as "Don't do that!" ? ?;^)= Bill -- Do not meddle in the affairs of sysadmins, for they are easy to annoy, and have the root password.

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zpatterns-0.4.0a5: problem with unregistering transactionals
by Jephte CLAIN 27 Jul '00

27 Jul '00

hello, I have a case where Transactional._unregister is called without Transactional._register being called, raising an exception in Transaction._unregister and then in ZODB.Transaction.Transaction.__del__, causing Zope to dump core when it is run as a daemon (because python notifies of the unhandled exception by writin to stderr) I have not yet found why (and how?) an object is Transactional._unregistered without being Transactional._registered before. (I even did not know about the existence of these methods!) But until I understand, this patch allow me to stay alive: --- Transactions.py.orig Thu Jul 20 09:58:00 2000 +++ Transactions.py Wed Jul 26 11:12:25 2000 @@ -45,7 +45,8 @@ self._v_registered = 1 def _unregister(self): - del self._v_registered + try: del self._v_registered + except: pass # From here down, override as you see fit... more to come when I have the time to figure out the problem. it might be a bug in zpatterns :-) regards, jephte.clain(a)univ-reunion.fr

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ZMySQLDA - errors during compilation...
by Jon Franz 27 Jul '00

27 Jul '00

Hello, I'm trying to install ZMySQLDA onto a Linux machine with Zope 2.2.0, python 1.5.2, and a newly installed (from source) copy of MySQL 3.22.23 (latest stable). I had to modify the include paths in Setup.in so it could find the include files, but now I get the following errors when running make: >>> gcc -fpic -I/usr/local/mysql/include/mysql -I/usr/include/mysql -g -O2 -I/usr/local/include/python1.5 - I/usr/local/include/python1.5 -DHAVE_CONFIG_H -c ./MySQLmodule.c ./MySQLmodule.c: In function `pythonify_row': ./MySQLmodule.c:238: warning: assignment from incompatible pointer type ./MySQLmodule.c: In function `pythonify_res_fields': ./MySQLmodule.c:384: invalid lvalue in unary `&' ./MySQLmodule.c: In function `STH_fetchdict': ./MySQLmodule.c:1125: invalid lvalue in unary `&' ./MySQLmodule.c:1147: invalid lvalue in unary `&' make: *** [MySQLmodule.o] Error 1 <<< any suggestions? I've had errors installing ZMySQLDA before, but nothing like this... Thanks in advance. ~ Jonathan M. Franz ~ Senior Developer/Technical Leader ~ ~ SW-Dev Division, Springdale, Ohio Office ~ 513.618.2248 ~ ~ OneNet Communications (A USNet/MDM Company) www.one.net ~

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SQL and customise screen
by Vincent 27 Jul '00

27 Jul '00

Hi, I would like to use an SQL request to search some data in an access database. The request need to be executed when somebody clic on a button (onclick="") The result need to be displayed on the screen, but not on one line. I must be able to place the results in different places on the document. If somebody has any idea. Vincent - Thanks PS : At least, I must be able to customise the array display with the search zope wizard

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Need for "aq_base" in DTML (was: Re: [Zope] Dumb DTML question - existance check of an object) (was: Re: [Zope] Dumb DTML question - existance check of an object)
by Dieter Maurer 26 Jul '00

26 Jul '00

Satheesh Babu writes: > I have a URL, say, /sub1/sub2. How do I check in DTML > whether > 1. folder sub1 exists or not > 2. If not, create it. > 3. folder sub2 exists under sub1 > 4. If not, create it. It is easy, if you are a bit sloppy. * Access to "/": "PARENTS[-1]" * Existence check: "_.hasattr(object,what)" NOTE, that this is the sloppy part. - "_.hasattr" will return true, if "object" has attribute "what" (that is what we want) *OR* when it has acquired such an attribute (we do *NOT* want that here). What we would need is a DTML accessible version of "aq_base". This is trivially handled by an external method. - it returns true, when there is such an attribute. This may not be a folder. You can check "meta_type" to see, it is indeed a folder. * creation: "manage_addFolder" look in the ZDP's (http:zdp.zope.org) object reference for the function's signature. I think, this info is available in the Zope 2.2 help system, too. Dieter

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