November 1999 - Zope-Dev

Keyword Indexes in ZCatalogs
by Alexandre Ratti 21 Nov '99

21 Nov '99

Hello, Could someone explain how to use Keyword Indexes in ZCatalogs? In a ZCatalog, we now have 3 index types: Text Index, Field Indexes and Keyword Indexes. Here is the information I have found so far about the Keyword type: "Keyword Indexes index a sequence of objects that act as 'keywords' for an object. A Keyword Index will return any objects that have one or more keywords specified in a search query." (source: Indexes tab of a Zcatalog) "Keyword Index: Subclasses all of the field index behavior, except that property values are treated as a sequence of keywords." (source: posting on a Zope list) Could someone provide an implementation example? Thanks. Alexandre

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Re: [Zope-dev] SQLSession help needed!
by Clayton Miller 20 Nov '99

20 Nov '99

Bill: Thanks, but yes this page includes both the standard_header_html and standard_footer_html documents. I did forget to include this information in my source code listing, sorry :^(. Clayton. >From: Bill Anderson <bill.anderson(a)libc.org> >To: Clayton Miller <cmille9(a)hotmail.com> >CC: zope-dev(a)zope.org >Subject: Re: [Zope-dev] SQLSession help needed! >Date: Sat, 20 Nov 1999 13:52:07 -0700 > >Clayton Miller wrote: > > > > I have posted this message on the Zope maillist but I did not get a good > > answer. So I decided maybe some real Geeks hang out here instead. I am > > having trouble getting the SESSION.set(...) to work. > > Here is the code I am using. > > > > <dtml-comment> > > -----code starts here -------- > > ZipCode = <dtml-var ZipCode> > > Distance = <dtml-var Distance> > > <dtml-var "SESSION.set('myZipCode', ZipCode)"> > > <dtml-var "SESSION.set('myDistance', Distance)"> > > <frameset cols="30%,70%"> > > <frame src="<dtml-var Root>/Menu" name="Menu"> > > <frame src="<dtml-var Root>/Main" name="Main"> > > </frameset> > > -----code ends here ------- > > </dtml-comment> > ><suggestion type=stab-in-the-dark> >Does this page include <dtlm-var standard_html_header> ? >If not, this may be part of the problem. ></suggestion> > >-- >"They laughed at Columbus, they laughed at Fulton, they laughed at the >Wright brothers. But they also laughed at Bozo the Clown." -- Carl >Sagan ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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SQLSession help needed!
by Clayton Miller 20 Nov '99

20 Nov '99

I have posted this message on the Zope maillist but I did not get a good answer. So I decided maybe some real Geeks hang out here instead. I am having trouble getting the SESSION.set(...) to work. Here is the code I am using. <dtml-comment> -----code starts here -------- ZipCode = <dtml-var ZipCode> Distance = <dtml-var Distance> <dtml-var "SESSION.set('myZipCode', ZipCode)"> <dtml-var "SESSION.set('myDistance', Distance)"> <frameset cols="30%,70%"> <frame src="<dtml-var Root>/Menu" name="Menu"> <frame src="<dtml-var Root>/Main" name="Main"> </frameset> -----code ends here ------- </dtml-comment> Here is the error I am getting: ! Temporarily Unavailable The resource you requested is temporarily unavailable - please try again later. (116) unable to connect, fd=5 If I <dtml-comment> out the SESSSION.sets on down. I do see the values of Zipcode and Distance working correctly. I am connecting to a Postgresql database. Zope/Apache/Postgresql are all running on my Linux box. I have created the Sessions and Session_data tables as prescribed. I have included a <dtml-call Session> in my standard_header_html file. Just to see if the code was working at all, I modified the SQLSession.py:__init__ routine to put the sessionName into the Session_data table. I can see this information just fine using a <dtml-var "REQUEST['SESSION']"> command. This shows one key called session (this is the name I gave it in __init__) and the value of sessionName (the value I assigned). This is the type of error I have received plenty of times when the SQL statement was incorrect somehow. Just how do you debug this error? I looked at standard_error_html and I do not see this error text. How do you find out which object /line is causing the problem? Thank you for the help. Clayton.

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Re: [Zope] Rules Based Applications
by Martijn Faassen 20 Nov '99

20 Nov '99

Jerry.Spicklemire(a)IFLYATA.COM wrote: > Hi Zope Fans, > > I've been searching the Web for references to > Rules Based Programming with Python, and Zope. > Not much so far. > > Anybody else out there interested in this topic? I am. Interesting direction you're looking in. Looking at logic programming might be a good idea; I recall a thread on comp.lang.python a while back on Python/prolog interfacing; that may contain some good references. There might also be something in the (new) Vaults of Parnassus: http://www.vex.net/~x/parnassus/ Hm, nothing obvious in the vaults besides the strout.net reference. I shall do some thinking on this. Keep us posted. I've moved this thread to zope-dev, by the way, or we'll have Paul onto us. :) Regards, Martijn

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creating trees with squishdot
by geoff nordli 19 Nov '99

19 Nov '99

Hopefully someone can give me a hand. I would like to create a tree structure based on subjects in a squishdot site. I have some code that looks like this:     which creates a tree based on articles (only the article id), and the comments--not what I am looking for. <dtml-tree branches_expr="KnowIT.subjects_list()"> <dtml-var id> </dtml-tree> this will create a tree with the same number of subjects that I have, but all named "KnowIT". I guess it is a little bit closer, but not close enough. Can someone help me fill in the blanks. thanks, geoff nordli

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XMLDocument patch
by Gabor Melis 19 Nov '99

19 Nov '99

Hi I made a patch to remedy two of the present bugs: 1) Escape <, & and > characters in toxml() 2) abort the transaction if parsing fails 1) uses the escape method from xml-sigs xml.utils, but this dependency can be removed. (not done now) I was wondering about encodings the other day (subject: XMLDocument shortcomings). If you have comments on how to introduce intelligent encoding/decoding please share it with me. Gabor

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Re: [Zope-dev] Writing custom folderish products
by Martijn Faassen 19 Nov '99

19 Nov '99

s341625(a)student.uq.edu.au wrote: > On 11/19/99, 9:32:08 PM, Martijn Faassen <faassen(a)vet.uu.nl> wrote > regarding Re: [Zope-dev] Writing custom folderish products: > [VisualZope explanation snipped] Hm, I'm not sure I get that yet. I have a difficult time understanding VisualZope, I'm afraid...seeing a working demo would *really* help in my understanding of it; I tried to install it again today but ended up with javascript errors. Once I really understand what it's for and what it can do, I'll be far more able to understand your explanations on how it works. >From what I understand it does sound way cool, though. :) [ZClass based approach:] > * Create a Zclass based on a folder and objectManager (this is > important - an objectManager is always required for some reason) And 'folder' is in fact not necessary; objectManager is enough. > * In the Methods area of this class create another zclass (say, > "MyObject" > * Then, in the SubObjects area pick MyObject as an object that can be > added within this folder > > Thats it! The user will only see MyObject in the "Add Object" > dropdown! I know this -- I've done this myself. But what I'm developing is a Python-only product; no ZClasses involved. I have a set of field classes (all deriving from a common base class; these are Zope products) and I want to make a folderish class to which they can be added. They shouldn't be addable anywhere else (in normal folders, for instance). Going through the source I found some stuff involving all_meta_types, meta_types and lots of magic code (to me) that seems to make products addable to folders. Zope's sources could use some documenting though.. I am assuming there is a clean mechanism to say: 'these products can only be added to this ObjectManagerish product, and nowhere else'. Could a real Zope Guru speak up now? On the bright side, all this Zope source digging does mean I know my way around significant parts of it now; don't understand much of it yet, but all helps on my road to the Zen, I suppose. :) Regards, Martijn

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Re: [Zope] Zope-2.1.0b2 fails on access to management screen
by Jim Cain 19 Nov '99

19 Nov '99

(I'm moving this to zope-dev.) On Fri, 19 Nov 1999, Martijn Pieters wrote: > At 15:52 19/11/99 , Jim Cain wrote: > >On Fri, 19 Nov 1999, Martijn Pieters wrote: > > > > > > > > >Yes, I have python 1.5.2 installed. I have used the same python > > > >installation with Zope 2.0.1 and several versions before that. > > > > > > Hmm... and make test still does alright? You get an error with standard > > > python library methods, very strange. > > > >Here is the make test output for python: > > Your tests run fine then. It's just that the call to > time.gmtime(time.time()) seemd to fail. You could try and do: > > python > >> import time > >> time.gmtime(time.time()) > > but I think that'll be alright. > > The problem then list with the PCGServer. The code around this statement > has changed between 2.0.1 and 2.1.0 beta 1. I have a feeling that > self.reply_code (line 231) is not an integer for you. > > You could change this to int(self.reply_code), or change corresponding %d > on line 225 (2nd one in the string) to %s. > > If this fixes things, file a Collector bug report. It might be something > deeper, or other places may need to be fixed. I tried the above changes, but I still got the same error. Then I tried removing things altogether, one at a time. Finally I discovered that by removing the first %d on line 225 and self.addr[1] on line 226, while leaving everything else alone, it works fine. One curious thing though: When I run it this way, the line it writes in the log file begins with ^D. Where is that character coming from? Jim

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RE: [Zope-dev] ctsybasemodule
by Michel Pelletier 19 Nov '99

19 Nov '99

> -----Original Message----- > From: Brusowankin, David [mailto:david.brusowankin@gs.com] > Sent: Friday, November 19, 1999 11:09 AM > To: 'zope-dev(a)zope.org' > Subject: [Zope-dev] ctsybasemodule > > > Hi, > > I noticed that you guys are maintaining ctsybasemodule for now. Actually we aren't. ctsybasemodule was pretty ripe with problems and bugs, so we wrote our own which is still in the hands of the testers who helped pay for its development. It will be releases as soon as they give it the OK. Which should be very soon. Mind you, our 'module' is not a Python DB API complient module, but rather a thin wrapper around the sybase ctlib C library. A DB API module could be quicky and easily written with our C module, but we have not written one and we don't plan on it. The only thing we are providing is the new C module and a Zope Sybase databse adapter. -Michel

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RE: [Zope-dev] Max objects before ZCatalog?
by Michel Pelletier 19 Nov '99

19 Nov '99

> -----Original Message----- > From: David Kankiewicz [mailto:kankie@thegrid.net] > Sent: Friday, November 19, 1999 12:50 AM > To: Zope-dev(a)zope.org > Subject: [Zope-dev] Max objects before ZCatalog? > > > > What is the magic number for performance? Between the > individual lookup, > doing a 'large catalog' ZCatalog search, and creating many ZCatalogs. 'large' here is a big number. ZCatalog stores it's index information in BTrees. Without getting into too much theory or insulting anyones intelligence, a BTree is a tree like data structure. When doing a 'search' you start at the top and work your way down the tree, comparing your search value to the value of each node in the tree. If you had on the order of a million objects, you would only make on the order of 10-20 or so comparisons. This is very fast and scales quite well. > > I'm accessing a few variable (~ 2-8) in 20-5000 (~max) subobjects and > testing them against the current objects variables. The design is for > something that most scale and can easily to be changed (I > have this half > done). I don't really understand what your saying here. But if you have 5000 cataloged objects, max, then you're well below flexing catalog. -Michel

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