January 2001 - Zope-Dev

ZPatterns: SAVING doesn't tolerate missing attributes
by Steve Alexander 06 Jan '01

06 Jan '01

In SkinScript such as WHEN eventspec CALL expression SAVING mementolist if any of the mementos in mementolist are not found, the script raises a KeyError. I'd like a way of saving a memento if it exists, or NOT_FOUND otherwise. For example, an Executive might have a CompanyCar. WITH CompanyCars.getCar(self.car_id) or NOT_FOUND COMPUTE car=RESULT, car_registration=registration OTHERWISE LET car=NOT_FOUND, car_registration="no car" When an Executive changes her car for a different one, I want to perform certain actions on the old car, and certain on the new car: WHEN OBJECT CHANGED CALL HAS_CHANGED('car_id') and (self.car_id and CompanyCars.getItem(self.car_id).decommission(), ORIGINAL['car_id'] and OLD['car'].commission()) SAVING car However, I can't do this if the executive is being assigned a car from a state of having no car. It fails with a KeyError because the ZPatterns machinery can't save "car". -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

2 2

MySQL with LAST_INSERT_ID()
by Arno Gross 06 Jan '01

06 Jan '01

Hi, I have a simple ZSQL method with this statement: SELECT LAST_INSERT_ID() This method works with Zope 2.2.4 under Linux and MySQL 3.22.32 but I got an error with Zope 2.2.2 under NT 4.0 and MySQL 3.22.29 Error, exceptions.KeyError: unhandled Any hints? Thanks Arno, arno.gross(a)consotec.de

1 0

ZPatterns: patch for OLD['name'] for Zope 2.3
by Steve Alexander 06 Jan '01

06 Jan '01

Something has changed in the way Zope 2.3 handles the __getitem__ protocol. This breaks SkinScript's use of OLD. The fix is to patch Agents.py so that the class _memento explicitly provides a __getitem__ method. ZPatterns may need similar fixes elsewhere. See my message to zope-dev earlier this week about the difference in using __getitem__ on Dataskins from a Specialist and in the ZODB. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net *** Agents.py.original --- Agents.py *************** *** 326,332 **** 'memento_exprs': 'Keeping:', 'handle_set_for':'Set Attrs:' } ! class _memento: pass _emptyMemento=_memento() --- 326,336 ---- 'memento_exprs': 'Keeping:', 'handle_set_for':'Set Attrs:' } ! class _memento: ! __allow_access_to_unprotected_subobjects__=1 ! def __getitem__(self, name): ! return self.__dict__[name] ! _emptyMemento=_memento()

1 0

zope on win95
by nando n 06 Jan '01

06 Jan '01

where can i download (exact url) binary version of zope to install it on my win95 system? for now i've only been able to download python source code version of zope. how do i execute dtml files? i just want to know that. thanks _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

2 1

software agents
by drawingincode 06 Jan '01

06 Jan '01

hi, is it appropriate "here" to ask that the zope-dev community might consider including developing "interoperability-facilitate" :) agents context, related to likes of; http://www.ai.sri.com/~oaa/ "A framework for integrating a community of heterogeneous software agents in a distributed environment." please note that althou my current site at; http://www.drawingincode.com is running flash 5 stuff (eventualy SVG) i have a dedicated server at dellhost- linux/zope for drawingincode.org a non-profit project in development, if that server could be of any use for you. thank you for the good spirit and happy new year michael p bolger -drawingincode.org was an exhibitor at O'Reilly/Monterey (learned alot on what to do better next-time) drawingincode

1 0

Re: [Zope-dev] Re: Spitter.c Hack
by Jason Spisak 06 Jan '01

06 Jan '01

Erik, > [Jason Spisak] > > | I am running on a big machine though. If anyone wants those changes > | there's really easy. Just mail me directly, since it's a long file > | to post. > > Hi. I would be interested in the file :-). > Okay, here's the diff. It truely is nothing more than cutting out the two parts that eliminate single letter words and numbers: *** Zope-2.2.4-src/lib/python/SearchIndex/Splitter.c --- Zope-2.2.4-src/lib/python/SearchIndex/Splitter_Old.c *************** *** 169,192 **** len = PyString_Size(word) - 1; len = PyString_Size(word); - /*if(len < 2) Single-letter words are stop words! - { - Py_INCREF(Py_None); - return Py_None; - } */ - - /************************************************************* - Test whether a word has any letters. */ for (; --len >= 0 && ! isalpha((unsigned char)cword[len]); ); - /*if (len < 0) - { - Py_INCREF(Py_None); - return Py_None; - } - - * If no letters, treat it as a stop word. - *************************************************************/ Py_INCREF(word); --- 169,176 ---- > Would you also be willing to share some statistics on how many objects > you have in how many indexes, and how much time "complex" searches > take? I do understand if this is not possible, but it'd be appetiated > if it was possible. :-) > > Thanks. Well, here's the some output of the "Status" tab in the Catalog. Subtransactions are Disabled Subtransactions --------------------------------------------------------- Index Status * 48205 object are indexed in bobobase_modification_time * 48205 object are indexed in calendar_date * 48205 object are indexed in calendar_day * 48205 object are indexed in call_date * 48205 object are indexed in curators * 48205 object are indexed in data * 48205 object are indexed in id * 48205 object are indexed in meta_type * 48205 object are indexed in resume_in * 48205 object are indexed in status * 48205 object are indexed in users_calendar The only TextIndex is the 'data' index though. It is the one that gets hammered. Let's see...time stats...hmmm I put a REQUEST.set with the ZopeTime at the top of the search page and at the bottom after the 'in' tag for the Catalog. Search terms are: los and angeles and C++ and MFC and 310 Subtracting the float of the two times I get 1.85400104523 I'm not sure what that comes out to, I think it's part of a day though because of DateTime. The server stats: Dual Intel 400mhz Xenon w/ 1MB cache each LVD RAID 5 7200 RPM disk array 1GB RAM RedHat Linux 6.1 with some kernel updates... And the best piece of open source software I know: Zope 2.2.4 binary release Hope that helps. All my best, Jason Spisak CIO __ ___ ______ __ / // (_)_____/_ __/__ ____/ / ___ _______ __ _ / _ / / __/ -_) / / -_) __/ _ \(_-<_/ __/ _ \/ ' \ /_//_/_/_/ \__/_/ \__/\__/_//_/___(_)__/\___/_/_/_/ 6151 West Century Boulevard Suite 900 Los Angeles, CA 90045 P. 310.665.3444 F. 310.665.3544 Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.

1 0

ZPatterns: __getitem__ on a DataSkin instance
by Steve Alexander 06 Jan '01

06 Jan '01

Let's say I have a DataSkin-derived ZClass that has the attribute "forename" (in a dataskin attribute propertysheet). If I get an instance of this ZClass from the ZODB (set up to use a Folder w/ customizer suppport), I can refer to the "forename" attribute using <dtml-var "this()['forename']">. However, if I get an instance of the same class from a Specialist, <dtml-var "this()['forename']"> gives me Error Type: AttributeError Error Value: __getitem__ Any idea why there's the difference? Can the latter case be fixed? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

4 6

ZPatterns: catching exceptions raised by triggers
by Steve Alexander 06 Jan '01

06 Jan '01

Let's say I have a trigger that is called to ensure that what something is changed to holds true. I use some skinscript like this: WHEN OBJECT ADDED, CHANGED CALL self.ensure_conditions_hold() I write the ensure_conditions_hold method so that it returns None if everything is ok, but raises an exception if there is a problem with the new state of the object. That's all fine. However, I want to catch this exception in my application, and handle it in a friendly way. However, I've tried using dtml-try blocks and try: except: blocks from Python Scripts, and either way, I cannot catch the exception. It still causes Zope to return the standard_error_message screen. I can only speculate that this is all due to the way that triggers get executed at the end of transaction. I guess I'll have to validate the data twice if I want to provide helpful feedback to the user. Stranger still, the error message is reporting itself to have a strange content-type, so my browser is asking me if I want to download it as a file; I'm pretty sure this isn't related to the skinscript though, as I can get the same effect with other errors. How do I catch an error raised by a Trigger? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

2 1

BTree Folders
by Chris Withers 05 Jan '01

05 Jan '01

Hi, There was talk a while back of re-doing BTree's in Zope so they were more efficient. Is that still going ahead? If I start using BTree folders now, will there be any nasties when the changes happen? Right, BTree folders wise, what I'm looking for is to have, in effect two Contents tabs for one BTree folder object, one showing all contained items of a particular meta_type (with the BTree Folder's interface to deal with lots of objects), and the other containing all other items in the folder (DTML Methods, Gifs, etc, with a normal folder's interface). What's the best way to do this? I was going going to subclass BTreeFolder, and overide the contents tab and provide an extra one, copying and hacking the DTML as appropriate to filter on meta_type. this strikes me as not very robust as I won't benefit from any improvements to either GUI that are made in the future. Is there perhaps a better way? Also, what's the difference between a 'Full' and a 'Basic' BTreeFolder, which one should I use? cheers, Chris

3 2

SkinScript reference in two-up postscript
by Steve Alexander 05 Jan '01

05 Jan '01

Hi folks, http://www.cat-box.net/steve/skinscript_ref-0-4-3b2.ps.gz This is a two-up A4 postscript version of PJE's most useful SkinScript reference. It prints out to four landscape-orientation A4 pages. http://www.cat-box.net/steve/skinscript_ref-0-4-3b2_letter.ps.gz This is similar, but for letter size paper. Also available in pdf: http://www.cat-box.net/steve/skinscript_ref-0-4-3b2.pdf http://www.cat-box.net/steve/skinscript_ref-0-4-3b2_letter.pdf The files were produced from the skinscript help page of ZPatterns 0-4-3b2, printed to a file with Mozilla, and then converted to 2-up pages using impose. The pdf versions were produced using ps2pdf on the postscript files. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

1 0