January 2002 - Zope-Dev

A Free Invitation
by heres2usa 15 Jan '02

15 Jan '02

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Accessing objects starting with _
by Adrian Hungate 15 Jan '02

15 Jan '02

I know that Zope uses the fact that an object or method starts with _ as a security feature, but is there a way of circumventing it? I am looking at the posibility of developing a basic level of Microsoft Frontpage support, but ALL frontpage actions contain _ in the folder names. If there is just one point in the code that I need to add a few exceptions to the "Can't start with _" rule, then I can do that - This project is fairly important. Adrian... -- Adrian Hungate All views expressed in this email are those of the whole world, however some people don't realise this yet.

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Utility of zope.org wiki page subscriptions
by Ken Manheimer 15 Jan '02

15 Jan '02

I'm finding the wiki page notifications mechanism extremely helpful for tracking wiki activity. While there's not much time available to tweak it further for people's needs, i'd like to collect feedback about how it does and doesn't serve other people's purposes, so that when we get around to the comprehensive effort we'll be able to factor-in that info! If you're using the feature and have comments, or not using the feature because of some shortcoming, please take a moment and add your comments to the effort feedback page: http://dev.zope.org/Wikis/DevSite/Projects/FishbowlNotificationsForNow/Feed… If you're not using the feature because you don't know about it (what the heck am i talking about, anyway?-), see a copy of the announcement at: http://dev.zope.org/Wikis/DevSite/Projects/FishbowlNotificationsForNow/Rele… (For those of you that missed that announcement and the "subscriptions" links, i think the feature is quite useful as is, and can significantly enhance the fishbowl process if it's used.) -- Ken klm(a)zope.com

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FYI: Sprint schedule online
by Paul Everitt 15 Jan '02

15 Jan '02

Whew, at long last, I've posted a Sprint Schedule at: http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/SprintSche… Boy, that URL is too long. I edited the dev.zope.org homepage to add links to the Zope3 page and the sprint schedule. This page also answers the question, "What is a sprint?" --Paul

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CMF attribute horror or too many [t|T]itles
by Romain Slootmaekers 15 Jan '02

15 Jan '02

Yo dudes, just a stupid simple question: After wrestling with the documentation, I have created my own CMF content type and it actually works except for some details. In retrospect, it was 90% code browsing, and 10% useful documentation,... cmf is fun, but the cmf dogbowl really sucks .. Anyway, The type I created has a method def Title(self,REQUEST=None): ... and that gets used by some of the skins, The meta data of the object also has an attribute Title, which is used by the Topics for indexing, Now my problem: when a topic lists one of my objects, it lists them with ... <li> <a href="&dtml-objURL;"><dtml-var Title>.</a> </li> ... but neither my Title() method nor the Meta-data's Title attribute gets to be used. I get an empty string. Where does that one come from ? To make it even more confusing, the object also acquires a title attribute from somewhere higher up the acquisition tree. PS: I noticed the same problem when adding fi a File object through the zope management api instead of the portal management interface. Anyone any clues ? TIA, Sloot.

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how to preserv information
by Champier 15 Jan '02

15 Jan '02

Hi, I'm a new zope programmer. I created a page which show different products (from a oracle database) which can be selected (products are shoiwn in checkbox format). As I have a lot of product I also manage button ('Next' and 'previous') The proble is : When I select some products from on page and then I use the button 'next' or 'pervious I lose the selected product of the last page.. Is someone can help me and give me some solution ?? Thanks for your help

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Re: Temporary Storage + Sessions + Versions: How?
by Chris McDonough 15 Jan '02

15 Jan '02

Joachim Werner wrote: > As the Temporary Storage is incompatible with versions, it seems to me that > I can not at all use any session manipulating code in a method that might be > called under version control. This is very disturbing to me. I'm sorry you're disturbed. ;-) > Are there any workarounds like temporarly switching off versioning before > the SESSION.set is called? Not really. > I guess the best fix would be if Temporary Storage would actually work with > versions. This would mean to me that it should gracefully ignore the fact > that we are working in a version. You're right, TemporaryStorage should really support versions. But it doesn't; there wasn't enough time. :-( Maybe in the future, but no promises. Note that you can put the data container in a versioning storage and get around this problem now. Re: TemporaryStorage ignoring versions. I think this might be OK for some pattern of usage. However, I can imagine receiving another email from somebody saying "how dare your sessions ignore versions; this has really messed me up and you've destroyed my project". ;-) I'd probably accept a patch however that allowed you to set an environment variable to control this behavior. Thanks! - C

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Fw: ZODB based Product problem
by Antonio Carrasco 14 Jan '02

14 Jan '02

----- Original Message ----- From: "Antonio Carrasco" <antoniojezu(a)hotmail.com> To: <zope(a)zope.org> Cc: <zodb-dev-(a)zope.org>; <zope-dev(a)zope.org> Sent: Monday, January 14, 2002 11:51 PM Subject: ZODB based Product problem > Don´t forget. I´m spanish and my english may not be enough good. Have fun > with this e-mail. > > I´ve been a lot of time looking for documentation, studing it and trying to > develop usefull things with ZODB. Here is my problem. > > Well. I´m working in a Product in wich I use a ZODB to store data. I don´t > use Data.fs, I´m trying to use the ZODB with my own file and collection. I > have a product with this properties or attributes: > id: the id of the instance. > title: the title > ZODBFile: The ZODB where the user want to store the data. I use this > name to construct a FileStorage wich is like > '<ZOPEDIR>/lib/python/Products/MyZProduct/var/' + ZODBFile + '.fs > colection: The colection inside the ZODBFile. > > When someone wants to add a MyZProduct instance, I show a form to fill this > attributes. Well, the __init__ is like this: > def __init__(self,id,title,ZODBFile,Colection): > self.id=id > self.title=title > self.ZODBFile=ZODBFile > self.Collection=Colection > #Now try to connect to the database > self.colection=FileStorage('<ZOPEDIR>/.......#and the name of the > ZODBFile > > This last line make the Zope to raise an Error Message in commit in > Connection object. I don´t remember now (I´m not at work), but something > like: > "Attempt to store data from a remote database connection" > > ??????????. What´s the problem?. May my ZProduct inherit some other Class or > ZClass to be able to store the data?. > > Later I do a self.connection=db.open(). Another problem with this line. I > can´t save in my class attributes this objects. The colection, neither the > connection, and I need both to make the ZODB navigation, and the ZODB open > and close methods. > > If you need more information, I´ll post another more comprensive e-mail. > > Thanks. > Antonio Carrasco > www.grupoiud.com > PD: For spanish people I have written a How-To / Tutorial named > crearUnProducto. > www.zope.org/Members/rociana/misHowTo/crearUnProducto > >

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ZODB based Product problem
by Antonio Carrasco 14 Jan '02

14 Jan '02

Don´t forget. I´m spanish and my english may not be enough good. Have fun with this e-mail. I´ve been a lot of time looking for documentation, studing it and trying to develop usefull things with ZODB. Here is my problem. Well. I´m working in a Product in wich I use a ZODB to store data. I don´t use Data.fs, I´m trying to use the ZODB with my own file and collection. I have a product with this properties or attributes: id: the id of the instance. title: the title ZODBFile: The ZODB where the user want to store the data. I use this name to construct a FileStorage wich is like '<ZOPEDIR>/lib/python/Products/MyZProduct/var/' + ZODBFile + '.fs colection: The colection inside the ZODBFile. When someone wants to add a MyZProduct instance, I show a form to fill this attributes. Well, the __init__ is like this: def __init__(self,id,title,ZODBFile,Colection): self.id=id self.title=title self.ZODBFile=ZODBFile self.Collection=Colection #Now try to connect to the database self.colection=FileStorage('<ZOPEDIR>/.......#and the name of the ZODBFile This last line make the Zope to raise an Error Message in commit in Connection object. I don´t remember now (I´m not at work), but something like: "Attempt to store data from a remote database connection" ??????????. What´s the problem?. May my ZProduct inherit some other Class or ZClass to be able to store the data?. Later I do a self.connection=db.open(). Another problem with this line. I can´t save in my class attributes this objects. The colection, neither the connection, and I need both to make the ZODB navigation, and the ZODB open and close methods. If you need more information, I´ll post another more comprensive e-mail. Thanks. Antonio Carrasco www.grupoiud.com PD: For spanish people I have written a How-To / Tutorial named crearUnProducto. www.zope.org/Members/rociana/misHowTo/crearUnProducto

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[Warning] Weird Zope behaviour: int(1200 * 0.20000000000000001) or 1 == -2147483648
by Dieter Maurer 14 Jan '02

14 Jan '02

ZopeCVS (trunk) from 9.1.2002; Python 2.1.1; Linux 2 I just met really strange behaviour: For testing purposes, I did: export ZODB_READ_ONLY=1 python >>> import Zope This lead to a deadlock in "ThreadLock.acquire". I ran the process in GDB with breakpoints in "ThreadLock.acquire" and "ThreadLock.release". After a while, I get an exception: > File "/home/dieter/Haufe/src/Zope/lib/python/Zope/__init__.py", line 77, in ? OFS.Application.initialize(c) > File "/home/dieter/Haufe/src/Zope/lib/python/OFS/Application.py", line 316, in initialize > delNotification = delnotify, limit=limit) > File "/home/dieter/Haufe/src/Zope/lib/python/Products/Transience/Transience.py", line 114, in __init__ > self._reset() > File "/home/dieter/Haufe/src/Zope/lib/python/Products/Transience/Transience.py", line 334, in _reset > self._ring = Ring(l, index) > File "/home/dieter/Haufe/src/Zope/lib/python/Products/Transience/Transience.py", line 479, in __init__ > raise "ring must have at least one element" > ring must have at least one element Analysis reveals, that in "_reset" we have: > (Pdb) p vars(self) > {'_err_margin': 0.20000000000000001, 'id': 'session_data', '_delCallback': None, 'title': 'Session Data Container', '_timeout_secs': 1200, '_limit': 1000, '_addCallback': None, '_resolution_secs': -2147483648} "_resolution_secs" is severely wrong! It was computed by: > t_secs = self._timeout_secs > r_secs = self._resolution_secs = int(t_secs * self._err_margin) or 1 and the result should have been "240" which I get, when I evaluate the expression in "pdb". Some serious bug is lingering here. I expect a memory corruption. Dieter

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