April 2002 - Zope - Zope lists

Problem Creating Instances Mysteriously Solved
by Dan Shafer 22 Apr '02

22 Apr '02

While we have no idea why this is the case, my incredible Zope hosting dude, David Elkins (hurrah.com) and I managed to get my code working so that I can now create instances of my own ZClasses reliably. We only did two things. We took the code that should have worked and didn't, copied it, and pasted it into a new DTML Method object with a different name (we called it 'test' instead of 'startClearing'). We restarted the back end of the Zope server. Now it works. It even works in its original form and name. No clue why. Frankly, only mildly interested in the reason. It works. I must, however, say that this has shaken my confidence in Zope a bit even though I am acutely aware that there could be dozens of non-Zope reasons for this to happen. This was just too weird and it cost me 21 unbillable hours. Weird.

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ERROR: id already in use (deleted item)
by JP Glutting 22 Apr '02

22 Apr '02

Hi all, I am having a problem with the following error: Error Type: Bad Request Error Value: The id "MHC" is invalid--it is already in use. The item in question used to exist, but was deleted. The database has since been packed (at least twice). The origin of this problem seems to come from a bad Version, which locked a series of objects, and would not allow them to be modifed, nor accept version changes (it reported that there were no changes to save). I deleted the objects and started over. They now seem to be "phantom objects", and undeletable. I had this problem with "phantom objects" going back as far as Zope 2.1.x, but I had hoped it was fixed. Any pointers to tools for debugging the ZODB, or tricks for orking around this (other than chaning the object's name - which I have alredy tried successfully, but it does leave these "blocks" in the database) woudl be very welcome. Cheers, JP Glutting

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dtml-tree name
by Marie ROBICHON 22 Apr '02

22 Apr '02

I would like to define the name attribute of the dtml-tree widget with a string returned by a script (called treename) but I'm not sure of the syntax. <dtml-tree expr="<dtml-var treename>" branches="tpValues"> doesn't work nor does <dtml-tree name="<dtml-var treename>" branches="tpValues"> nor <dtml-tree treename branches="tpValues"> Any ideas anyone? TIA Marie Robichon Web Task Force European Synchrotron Radiation Facility Grenoble France

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changing property in __call__ without undo log entry (counter)
by Marcus Schopen 22 Apr '02

22 Apr '02

Hei, how to change counter's value without getting an undo log entry: def __call__(self, client=None, REQUEST={}, RESPONSE=None, **kw): [...] self.counter = self.counter + 1 It's not a counter product itself, but just a feature I want to put to an existing product without using one of the existing counter products (eg. FSCounter, ThreadSafeCounter etc.) Any ideas? Thanks Marcus -- ,---- [ Marcus Schopen ] | (0> | //\ P.O. Box 10 25 25 | V_/_ 33525 Bielefeld | Germany `---- __________________________________________________ Petition for a Software Patent Free Europe http://petition.eurolinux.org

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DTML to create a product instance (ExternalFile)
by davis marques 22 Apr '02

22 Apr '02

I'm new to Zope and am having a lot of problems figuring out how to do something in DTML which I expect should be relatively simple. I have a product called ExternalFile installed. I want to be able to create a new instance of this object based on information supplied by the user in a form. I presume DTML is capable of doing this, but my searches have turned up nothing of help to date. I found this snippet of code from a Job Board HOWTO on the Zope site, but am not clear if I can reuse this model for ExternalFile, and what the method name might be to add a new instance of the product. <dtml-call "REQUEST.set('ts', ZopeTime())"> <dtml-call "REQUEST.set('id',_.str(_.int(ts)))"> <dtml-with "job_board_entry.createInObjectManager(REQUEST['id'], REQUEST)"> </dtml-with> I can surmise from this that REQUEST is an array that is passed to the object's createInObjectManager method. Is this method common to all objects that reside in folders? How can you find out the names of the available methods for a product? Also, the with construct is looking quite mysterious to me right now. If anyone has a sensible explanation for it that would be appreciated. Any help would be appreciated. Davis _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.

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recursive paths
by hataw001 22 Apr '02

22 Apr '02

we are seeking to develop a method of displaying a recursive path without using folder structure. we want it to be based on a property which contains the folder location of the parent file. have any of you done this or have any advice for us. if so, any help would be greatly appreciated. john & brad hataw001(a)bama.ua.edu

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SQL from ZPT
by Chetan Kumar 22 Apr '02

22 Apr '02

Hi all How can one call SQL methods from ZPT ? The information on the site does not have any examples. TIA Chetan

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Get PropertySheets values with python/dtml
by Nuno Teixeira 22 Apr '02

22 Apr '02

Hi! I'm using ZClass and i'm trying to use Calendar tag to provide a cool interface for editing and viewing of objects that belong to that ZClass... I've just created admin links to each cell (cell=object). The url format is the usual: path_to_object/edit where edit is a dtml-method defined on ZClass. Now i have a problem. I want that each cell shows info from each object, ie, acessing to propertysheets values. I know that exists Propertysheets's method: propertyValues() but i don't know how to get it from a "dynamic" object: i have something like the following: <dtml-calendar> (...) <dtml-call "REQUEST.set('ManagerID', Year + _.string.zfill(Month,2))"> <dtml-var "date.day()"> <dtml-comment> editEventoForm is just a RESPONSE.redirect to a dtml defined at zclass </dtml-comment> <a href="editEventoForm?ManagerID=<dtml-var ManagerID>&Day=<dtml-var "date.day()">&Type=1">R</a> (...) <dtml-comment> ManagerID - id of "root" object date.day - id of subobject of ManagerID i want that info returns values from propertysheet related with ManagerID/date.day how should i define info? </dtml-comment> <dtml-var info> </dtml-calendar> Any clue? Thanks in advance! Nuno Teixeira

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Coding help
by Todd Loomis, DMSO (SAIC) 22 Apr '02

22 Apr '02

All: Why when I use the below code to check for a password if one isn't found the page ask me to download a file instead of returning my results for the page. <dtml-in locator> <dtml-if Password> <dtml-sendmail smtphost="thunderbird.dmso.mil"> To: <dtml-var Username> From: register(a)dmso.mil Subject: DMSO Extranet - Password Dear <dtml-var Realname>: Here's your DMSO Extranet password: <dtml-var Password> Sincerely, DMSO </dtml-sendmail> <dtml-var standard_html_header> Your password has been emailed. <dtml-var standard_html_footer> <dtml-else> <dtml-var standard_html_header> No account with the username <dtml-var Username> found. <dtml-var standard_html_footer> </dtml-if> </dtml-in> Regards, Todd

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Search ZCatalog with wildcard
by Peter Bengtsson 22 Apr '02

22 Apr '02

I want to search my ZCatalog like I do with SQL using LIKE and % wildcards. return context.ZCatalog({'id':'peter%%'}) ...should return "peter.html", "peter.jpg", "peterblablabla" I think. However this does not work. What is the syntax to do a wildcard search on a ZCatalog??

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