February 2001 - Zope-Dev

Zope 2.3.1b1 bug? (:tokens)
by Erik Enge 20 Feb '01

20 Feb '01

Hiya. variable:tokens is a bit fubar. If I raise it on the next page it says stuff like ['item', 'item1', 'item', 'item'] ie. it repeats some of the items in variable for no apparent reason (variable contains only 'item' and 'item1'). Also, if I do: <input type="hidden" name="variable2:tokens" value=" <dtml-in variable><dtml-var "_['sequence-item']"> </dtml-in>"> and raise variable2 on the "next page" it says: ['item', ['item1']] Is it just my installation? Zope 2.3.1b1 on Linux 2.4.1 with python 1.5.2. If need be I can do a thorougher report and possibly a patch, but not till later this week I'm afraid.

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Zope 2.2.4 Dying
by Andre Schubert 20 Feb '01

20 Feb '01

Hi, since the last time i had some problems with my zope server. The zope 2.2.4 running under linux dies unexpectly with the following messages. 2001-02-16T01:50:08 ERROR(200) zdaemon zdaemon: Fri Feb 16 02:50:08 2001: Aiieee! 5451 exited with error code: 13 ------ 2001-02-16T02:29:38 ERROR(200) zdaemon zdaemon: Fri Feb 16 03:29:38 2001: Aiieee! 10313 exited with error code: 13 What does the error code 13 say and could anyone help me to solve the problem as

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Zope Directions Roadmap Posted
by Amos Latteier 19 Feb '01

19 Feb '01

Hello Zopistas, I am excited to announce a Zope Directions Roadmap. http://dev.zope.org/Resources/ZopeDirections.html This document summarizes current thinking at DC about where the Zope platform is going from an architectural point of view. It summarizes informal conversations that we've been having internally for the past couple months. This paper talks about how we'd like to improve Zope to make it easier for developers. It puts some existing initiatives (e.g. Presentation Templates, and CMF) in context, and discusses potential future projects like moving to a component architecture. I should point out that this document is not a concrete plan so much as a statement of what's on our minds. Zope development will continue to operate openly in the fishbowl. We'd love to hear what you have to say. Are we heading in the right direction? Is there something else that we should be doing instead to help developers? Let us know. And when we begin new fishbowl projects (look for a component architecture project soon) jump in and help define Zope's future! -Amos -- Amos Latteier mailto:amos@digicool.com Digital Creations http://www.digicool.com

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RE: [Zope] Newcomer
by Bob Gailer 19 Feb '01

19 Feb '01

Andy: Thank you for replying to my questions. I'd like to clarify some of them, and see where I should be asking them. I do realize they are not Zope-specific issues. My assumption is that other Zope developers have encountered similar needs and have solved them. Re client stuff: Part of the problem for me is that I an not sufficiently familiar with the technology; I have heard terms like "Java Swing" and "Applets" that (I think) address what I want; form components that send data to and receive updates from a server process without retransmit ting the entire page. So this question is: How do I use (Zope and) Python to receive data from such components and send updated data to one or more of these components? The person who introduced me to Zope said that there was a Python runtime version that could run bytecode in a page using the JVM in a browser. So I need to know if this is true, and how to set it up. > Uggh Visual FoxPro? Don't use foxpro Well I wish I had have known that 4.5 years ago. Microsoft sold me a piece of junk with really slick advertising. At that time it was the only tool I knew of that was capable of cross-platform (PC-MAC) application development. I did not know that the RAD they promised was almost completely negated by the abysmal documentation, bugs, errors; I also did not know that they were dropping Mac support. Sigh. Those issues aside, I have enjoyed VFP; it has been my introduction to OOP and we do have a marketable product. The goal now is to re-engineer the application for the Web using (I presume) Zope, Python, and mySQL. > what ODBC product are you using. "Zope ODBC Database Adapter 3.1.0b2 (Development) 1999/09/03" Bob Gailer mailto:ramrom@earthling.net 303-442-2625

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Waaagh! Python Script won't allow __setitem__
by Chris Withers 19 Feb '01

19 Feb '01

Hi, I've got an object which implements __setitem__ in such a way that it's perfectly safe for use in Python Scripts. Sadly, it seems that Evan's Byte Code hacks won't let me do this :-( Whenever I try to do something like: myobject['fish']=1, I get a traceback like the following: Traceback (innermost last): File E:\Zope\237994~1.0\lib\python\Shared\DC\Scripts\Bindings.py, line 324, in __call__ (Object: ThePythonScript) File E:\Zope\237994~1.0\lib\python\Shared\DC\Scripts\Bindings.py, line 353, in _bindAndExec (Object: ThePythonScript) File E:\Zope\237994~1.0\lib\python\Products\PythonScripts\PythonScript.py, line 330, in _exec (Object: ThePythonScript) (Info: ({'script': <PythonScript instance at 016D16F0>, 'container': <AProduct instance at 01923AA0>, 'traverse_subpath': [], 'context': <AnotherProduct instance at 01888250>}, ({<a dictionary of arguments>},), {}, None)) File Script (Python), line 6, in ThePythonScript File E:\Zope\237994~1.0\lib\python\Products\PythonScripts\zbytecodehacks\VSExec.py, line 429, in __setitem__ TypeError: (see above) Is there any way I can get around this other than renaming __setitem__ to set, which screws up the nice python syntax? cheers, Chris

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Re: [Zope-dev] ZPatterns and SQL
by cs＠comlounge.net 19 Feb '01

19 Feb '01

Hi! > >So I shouldn't define it inside the ZClass propertysheet? > >Do I understand this right? > >(I remember having problems when using properties not defined in a > >sheet somewhere.. or am I mistaken completely somehow? ;-) > > You can't do this with a load attribute, because a default value will > exist. The easiest way to deal with this is simply to have a seperate > attribute name just for loading, or use an attribute that isn't on a > property sheet. Ok, I now removed customer_id (which won't be set anyway as this is the id set by the database automatically) from the propertysheet and used this as loading attribute. Seems to work now :) (though I am still confused a little, as I tried one non-existing attribute and it didn't work. But this one also was not defined inside the SkinScript and the database). But it's working now, so it's ok :) Thanks again! Christian -- COM.lounge http://comlounge.net/ communication & design info(a)comlounge.net

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Re: [Zope-dev] ZPatterns and SQL
by cs＠comlounge.net 19 Feb '01

19 Feb '01

Hi! > >So as the item is an instance of my ZClass containing also an company_name > attribute > >it will always return the item and because of that the Rack thinks it's > already there. > >So why is this happening? What do I need to change? > > You need to use an attribute which the object has *if and only if* it > exists in the database. If the class has the attribute defined, all > instances exist, and you can't even load it with SkinScript because > ZPatterns uses __getattr__ to redefine attributes, and that doesn't work if > the attribute already exists in the class. So I shouldn't define it inside the ZClass propertysheet? Do I understand this right? (I remember having problems when using properties not defined in a sheet somewhere.. or am I mistaken completely somehow? ;-) > >When changing the loadAttrib to something else (non existing), the newItem > is working > >but instead getItem is not working anymore as it returns None only.. > (somehow the zsql > >method is not even called thus the skinscript seems not to work in that > case (I guess > >because the loadAttrib is not defined in it somewhere)). > > Right. The load attribute has to be one defined in a provider, and which > will end up being "NOT_FOUND" if the object doesn't exist in the table > you're querying. I will experiment a little with this information. Hope it helps :) Thanks! -- christian -- COM.lounge http://comlounge.net/ communication & design info(a)comlounge.net

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SkinScripts instantiating new objects
by Stefan Karlsson 19 Feb '01

19 Feb '01

Hi, I want my SkinScript to instantiate a new object of type ProjektHandler and put it into an attribute called projekt. For this I have created an external method, returning a new object of type ProjektHandler (simplified): def getNewProjektHandler(self, parentId, parentClass): h = ProjektHandler() return h The skinscript look like this: WITH self.getNewProjektHandler(self.id, 'Projektagare') COMPUTE projekt=RESULT This works if I call it from python, e. g print self.mySpecialist.getItem('foo').projekt But it does not work when I call it from the web, e. g http://server/mySpecialist/foo/projekt (see the traceback from the log file below) Has anyone an idea why this doesn't work? Zope 2.3.0b2 ZPatterns 0.4.3b1 /Stefan Karlsson ------ 2001-02-16T11:28:35 PROBLEM(100) ZPatterns Error computing attribute projekt Traceback (innermost last): File /home/stefan/myzope/zope2/lib/python/Products/ZPatterns/AttributeProviders.py, line 311, in _ AttributeFor (Object: GAPMixin) File Products/ZPatterns/Expressions.py, line 122, in eval File DocumentTemplate/DT_Util.py, line 336, in eval (Object: self . getNewProjektHandler ( self . id , 'Projektagare' )) (Info: self) File <string>, line 0, in ? File DocumentTemplate/DT_Util.py, line 140, in careful_getattr AttributeError: getNewProjektHandler

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More PythonScript woe :-(
by Chris Withers 19 Feb '01

19 Feb '01

If I try and do: if type(x) == type(0): ...I get a NameError on type :-( What is so bad about type that I can't use it safely in PythonScripts?!? frustratedly, Chris

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ZPatterns and SQL
by cs＠comlounge.net 19 Feb '01

19 Feb '01

Hi there! I have a little problem with my Specialist and DataSkins regarding storage inside an sql database. Mainly I don't know what to put under the "loading by accessing attribute" in the Storage tab of the Rack. I have the following SkinScript: WITH QUERY getCustomer(customer_id=self.id) COMPUTE company_name, customer_no WHEN OBJECT ADDED CALL addCustomer( company_name=self.company_name, customer_no=self.customer_no ) WHEN OBJECT CHANGED STORE company_name,customer_no USING updateCustomer(customer_id=self.id, company_name=self.company_name, customer_no=self.customer_no ) I've now set the loadAttrib to "company_name" and retrieving objects works fine. Unfortunately when doing a newItem() with some random new id (it's not used as the database should provide the id) I get an error that this id already exists. Of course I've checked it in the database and it's not there. After some code reading I found in retrieveItem: a = self.loadAttrib item = None if a: item = self._RawItem(key) if hasattr(item.aq_base, a): return item So as the item is an instance of my ZClass containing also an company_name attribute it will always return the item and because of that the Rack thinks it's already there. So why is this happening? What do I need to change? When changing the loadAttrib to something else (non existing), the newItem is working but instead getItem is not working anymore as it returns None only.. (somehow the zsql method is not even called thus the skinscript seems not to work in that case (I guess because the loadAttrib is not defined in it somewhere)). Does anybody know any help? (somehow I once had a working specialist with an sql table but I dunno what happened to make it not work anymore). My ZPatterns version is the one of stevea and my Zope is 2.3 kind regards, Christian -- COM.lounge http://comlounge.net/ communication & design info(a)comlounge.net

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