- Zope - Zope lists

RE: [Zope] ZODB vs SQL, ZTables
by Michel Pelletier 07 Jun '99

07 Jun '99

> -----Original Message----- > From: Jordan B. Baker [mailto:jbb@spyderlab.com] > Sent: Monday, June 07, 1999 12:20 PM > To: zope(a)zope.org > Subject: [Zope] ZODB vs SQL, ZTables > > > hi zopesters: > > I am designing an application where I'd like use the ZODB as > the primary > storage and the objects being instances of ZClasses. > > I'd like to navigate through them using a hierarchal category system. > > Now, I assume that once I have this I can also provide other ways to > traverse the data by building indexes. I realize this isn't quite > documented yet and its not totally importart atm because the > dataset size > is small enough, but I'd like allow this app. to scale. > > I'm not sure if building indexes is the only way to get > another 'view' of > the data stored in the ZODB. I could write an exthernal > method to query > using the 'slow' objectValues() method, I suppose. > > The questions I have are: > > 1) Would I be re-inventing the wheel here? Can ZTables instantiate > ZClasses? The reason I like the ZClasses is because I'd like > to write my > business logic in Python. I suppose I could do this with External > methods. > ZTables return an result 'object' called a 'brain'. This object is instanciated on the fly when you make queries. If you define your own type of brain, then you can have your own types of objects. I don't see any reason why this object couldn't be a ZClass, but currently there is no mechanism to hook the two together through the ZClass, there would have to be some python involved. > 2) I realize the indexing system isn't well documented at > this point, but > if you can figure out the system is it usable? :) > It's very usable. I'm working on some documentation for it right now, but it might be lower level than you think. What you might want to wait for is the Catalog, whose purpose is to do exactly what you want, catalog and index Zope objects. > I'm just struggling a bit with the concepts of going > completely OO instead > of storing my data in a SQL database. > There are benefits to using SQL, and there are benefits to using objects. You have to weigh these things when elaborating your design. if you think your system is very object oriented, or very relational, or a hybrid of the two. > Has anyone tackled any of these issues? Was it worth it? > We are tackling it internally, whether it was worth it or not is yet to be seen. ;) (give us lots of money, and it's worth it) The catalog is designed to do almost exactly what your looking for. It's unclear at the moment what exactly will get open sourced as a the 'catalog' since the catalog consists of several layers of components at the moment. Chances are there will be no managment interface (maybe a minimal one), just a DTML API which you can use to search or manipulate the catalog. -Michel > Thanks guys, > > ------- > Jordan B. Baker -- jbb(a)spyderlab.com > weaving the web @ http://www.spyderlab.com > > > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev ) >

3 2

Subclass folder using Z Classes?
by Alexander Staubo 07 Jun '99

07 Jun '99

Is there a way to create folder-like (ie., container) classes using Z Classes? (I'm using Zope 1.11.) -- Alexander Staubo http://www.mop.no/~alex/ "`This must be Thursday,' said Arthur to himself, sinking low over his beer, `I never could get the hang of Thursdays.'" --Douglas Adams, _The Hitchhiker's Guide to the Galaxy_

1 0

Alpha version of mod_pcgi
by A.M. Kuchling 07 Jun '99

07 Jun '99

I've been wanting to learn how to write Apache extensions for a while, and have written a mod_pcgi module. Currently it seems to be able to talk to the long-running PCGI process correctly, though the Zope request doesn't run (I think because the code isn't setting SCRIPT_NAME yet). The code's at: ftp://starship.python.net/pub/crew/amk/new/mod_pcgi.tgz I'll hack on mod_pcgi for the next few days, but I definitely do *not* want to maintain the code long-term, so a volunteer or DC employee will have to adopt it eventually. -- A.M. Kuchling http://starship.python.net/crew/amk/ BTW, I learned a lovely new acronym today: "Law Enforcement Agency Key" - LEAK. -- Charles H. Lindsey

2 1

Weird-ish things with new Zope install on Win32...
by Zope on a Rope 07 Jun '99

07 Jun '99

Hello Zopistas. I downloaded and installed the latest stable version of Zope for Win32. I immediately fired it up, connected to localhost:9673 and played. Sheer brilliance! I'm totally wowed (I notice you lot don't go for the <0.5 wink> thing over here so I'll try and refrain). The main weird thing that I noticed is that the HTTP server is disastrously slow if the remote IP doesn't have a DNS map. I'm sure I'm not the first to notice this. Is there a quick way to stop a remote lookup on IPs? Now on to the real problem. I found the tree control and added it to the standard HTML header. Very nice. Then I found the sexy-with-images tree over at zdp.zope.org, fired up a session, and tweaked my #var sidebar which is what I called the tree. The new tree worked just fine on the opening index_html method but each index_html document in sub folders didn't work. I'd either get a 'Sorry, an error occured' or a space in the table where the tree should be and no tree. So then I commited the session thinking maybe that would help. Oh dear. Good job I'm testing, eh? Thanks for any insight. Did I royally, unintentionally screw something up or did I stumble across a known issue/bug/whatever they call it where you are. Another thought: While I have your ears, I feel like there is a tremendous amount of power in Zope that I'm just not getting. The zdp does a wonderful job of explaining what it explains (nice HOWTO's) but I'm either really dopey or I can't find the meat of the Zope documentation. I can't even remember how I stumbled on the tree control in the first place. What else is burried in there that's awesome but out of my sight? Don't get me wrong, I'm not bitching. I'm just a little disoriented in this whizzy new world and need a map. Cheers, Jules -- Codito, ergo sum.

4 5

RE: [Zope] Weird-ish things with new Zope install on Win32...
by Zope on a Rope 07 Jun '99

07 Jun '99

At 11:42 AM 6/7/99 -0400, Michel Pelletier wrote: >[deletia] >You might want to check out ZServer I shall make it so. Thank you. >Sounds like you are getting mired in Acquisition. Without seeing your >DTML and tracebacks, however, there isn't much more advice than that I >could give you. (here's a hint, view the HTML source of any error >messages you get, there are secret clues inside). Now that's a nifty trick. Here's where I am: 1. I blew everything away and started again. Just In Case(tm). 2. I created a new method called sidebar which I pretty much stole from the zdp Zope Book area. The main difference is that it's not all sitting in a folder (folder? Object? What should I call this?) called Object. 2a. Here's my sidebar: - - - Cut here - - - <span class="tree">    <img src="/zzzImages/openBook" align="TOP" border="0" width="16" height="16">  <img src="/zzzImages/closedBook" align="TOP" border="0" width="16" height="16">    <img src="/zzzImages/document" align="TOP" border="0" width="16" height="16"> <a href="/?tree-s=&tree-e=&tree-c="></a>  </span> - - - Cut here - - - Remember I have no idea what I'm doing at this point so I could have mangled it as I tried to make it fit. 3. The main index_html method works like a champ, as before. The sidebar does tree-like things. 4. Onwards. I created a subfolder and an index_html document. 5. As soon as I add the standard html header, it barfs: - - - Cut here - - - Traceback (innermost last): File D:\Program Files\ZopeWebSite\lib\python\ZPublisher\Publish.py, line 877, in publish_module File D:\Program Files\ZopeWebSite\lib\python\ZPublisher\Publish.py, line 590, in publish (Info: /Barry/index_html) File D:\Program Files\ZopeWebSite\lib\python\OFS\DTMLDocument.py, line 212, in __call__ (Object: index_html) File D:\Program Files\ZopeWebSite\lib\python\OFS\DTMLDocument.py, line 208, in __call__ (Object: index_html) File D:\Program Files\ZopeWebSite\lib\python\DocumentTemplate\DT_String.py, line 513, in __call__ (Object: index_html) File D:\Program Files\ZopeWebSite\lib\python\OFS\DTMLMethod.py, line 147, in __call__ (Object: standard_html_header) File D:\Program Files\ZopeWebSite\lib\python\DocumentTemplate\DT_String.py, line 513, in __call__ (Object: standard_html_header) File D:\Program Files\ZopeWebSite\lib\python\OFS\DTMLMethod.py, line 147, in __call__ (Object: sidebar) File D:\Program Files\ZopeWebSite\lib\python\DocumentTemplate\DT_String.py, line 513, in __call__ (Object: sidebar) File D:\Program Files\ZopeWebSite\lib\python\TreeDisplay\TreeTag.py, line 154, in render (Object: a tree tag) File D:\Program Files\ZopeWebSite\lib\python\TreeDisplay\TreeTag.py, line 222, in tpRender (Object: index_html) File D:\Program Files\ZopeWebSite\lib\python\TreeDisplay\TreeTag.py, line 535, in apply_diff (Info: ([None, ([178, []],)], [171])) AttributeError: Sorry, an error occured - - - Cut here - - - I also experimented adding a method called index_html in my subfolder (as that's what works in the root folder) and had little luck with that. Clearly, I've hosed something up in the sidebar. It's also possible, in true personal style, I'm trying to run before I can walk. I'm enthralled with Zope and want to squeeze the life out of it. Maybe I should buy it dinner and a movie and get to know it a little better first? I-haven't-been-this-excited-since-bill-gates-got-pied-ly-yours, Jules

1 0

First bad experience with Zserver or ZPublisher !?
by Francois-Regis CHALAOUX 07 Jun '99

07 Jun '99

Hi All, I tried to use the ZServer with Zope-1.11.0pr1-linux2-x86.tgz on an Pentium processor to evaluate my application in the futur. But, "Zope" seem to have a problem now with gadfly queries ( see belows ). The connexion is not broken and all queries give the same message as below. I tried with Zope 2.00a but the problems are more importants : TinyTable is broken then cannot test my application. Help please, I cannot live with ZHTTPserver crashing so often :( FR Error message ========== <HTML> <HEAD><TITLE>Zope Error</TITLE></HEAD> <BODY> <TABLE BORDER="0" WIDTH="100%"> <TR VALIGN="TOP"> <TD WIDTH="10%" ALIGN="CENTER">   </TD> <TD WIDTH="90%"> <H2>Zope Error</H2> <P>Zope has encountered an error while publishing this resource. </P> <P><STRONG>exceptions.AttributeError</STRONG></P> Sorry, a Zope error occurred.<p>  <HR NOSHADE> <P>Troubleshooting Suggestions</P> <UL> <LI>The URL may be incorrect.</LI> <LI>The parameters passed to this resource may be incorrect.</LI> <LI>A resource that this resource relies on may be encountering an error.</LI> </UL> <P>For more detailed information about the error, please refer to the HTML source for this page. </P> <P>If the error persists please contact the site maintainer. Thank you for your patience. </P> </TD></TR> </TABLE> </BODY> </HTML>

1 0

ZODB vs SQL, ZTables
by Jordan B. Baker 07 Jun '99

07 Jun '99

hi zopesters: I am designing an application where I'd like use the ZODB as the primary storage and the objects being instances of ZClasses. I'd like to navigate through them using a hierarchal category system. Now, I assume that once I have this I can also provide other ways to traverse the data by building indexes. I realize this isn't quite documented yet and its not totally importart atm because the dataset size is small enough, but I'd like allow this app. to scale. I'm not sure if building indexes is the only way to get another 'view' of the data stored in the ZODB. I could write an exthernal method to query using the 'slow' objectValues() method, I suppose. The questions I have are: 1) Would I be re-inventing the wheel here? Can ZTables instantiate ZClasses? The reason I like the ZClasses is because I'd like to write my business logic in Python. I suppose I could do this with External methods. 2) I realize the indexing system isn't well documented at this point, but if you can figure out the system is it usable? :) I'm just struggling a bit with the concepts of going completely OO instead of storing my data in a SQL database. Has anyone tackled any of these issues? Was it worth it? Thanks guys, ------- Jordan B. Baker -- jbb(a)spyderlab.com weaving the web @ http://www.spyderlab.com

1 0

RE: [Zope] Weird-ish things with new Zope install on Win32...
by Michel Pelletier 07 Jun '99

07 Jun '99

> -----Original Message----- > From: Zope on a Rope [mailto:zope@jules.com] > Sent: Monday, June 07, 1999 10:26 AM > To: zope(a)zope.org > Subject: [Zope] Weird-ish things with new Zope install on Win32... > > > Hello Zopistas. > > > The main weird thing that I noticed is that the HTTP server > is disastrously > slow if the remote IP doesn't have a DNS map. I'm sure I'm > not the first to > notice this. Is there a quick way to stop a remote lookup on IPs? > This is a server specific thing. Which HTTP server are you using? ZopeHTTPServer? You might want to check out ZServer, it's in beta, but we are putting much more effort into it than ZopeHTTPServer (which we are putting no effort into). > Now on to the real problem. > <snip> > > The new tree worked just fine on the opening index_html > method but each > index_html document in sub folders didn't work. I'd either > get a 'Sorry, an > error occured' or a space in the table where the tree should > be and no tree. > Sounds like you are getting mired in Acquisition. Without seeing your DTML and tracebacks, however, there isn't much more advice than that I could give you. (here's a hint, view the HTML source of any error messages you get, there are secret clues inside). > So then I commited the session thinking maybe that would > help. Oh dear. > Good job I'm testing, eh? You can allways 'undo'. The ZODB is a rather powerful object database. > Another thought: While I have your ears, I feel like there is > a tremendous > amount of power in Zope that I'm just not getting. The zdp > does a wonderful > job of explaining what it explains (nice HOWTO's) but I'm > either really > dopey or I can't find the meat of the Zope documentation. I can't even > remember how I stumbled on the tree control in the first > place. What else > is burried in there that's awesome but out of my sight? Don't > get me wrong, > I'm not bitching. I'm just a little disoriented in this > whizzy new world > and need a map. > Ah yes, the Zen of Zope. It's not just you, there is some very deep and powerful things going on underneath the minimalist management interface. At first they may seem a bit quirkly, but once groked the beauty of some of Zope's mechanisms are shocking. It even more shocking that people have been doing things any other way for so long. I can't really give you much insight, but I suggest looking at http://zdp.zope.org, those guys are putting together alot of jumpstarter material. Some more Zen material may be forthcomming. -Michel > Cheers, > Jules > > -- > Codito, ergo sum. > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev ) >

1 0

next-sequence and previous-sequence help..
by Tony McDonald 07 Jun '99

07 Jun '99

Hi all, I'm trying to get something working that displays a sequence from a database and provide next-sequence and previous-sequence buttons. What is different from the online documentation is that I want both the buttons at the end of a sequence block. eg, I want,  . ..the values from my_sequence...  previous button (batch of five).   next button (batch of five)   whereas the Zope docs imply this format,   previous button (batch of five).  ..the values from my_sequence...  next button (batch of five)   The problem is that the previous-sequence button is not shown (at all). The docs say 'previous-sequence:: the variable is true when the first element is displayed, and when the first element displayed is not the first element in the sequence' This *seems* to imply that previous-sequence can only be used at the beginning of a sequence...(and presumably that next-sequence can only be used at the end of a sequence). Is this right? tone ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2

2 1

arghhghghg Zope and PIL.
by Anthony Baxter 07 Jun '99

07 Jun '99

I seem to recall /F had a bit of a rant about this one earlier, but I'll just add my two bits worth: Can the ImageFile module _please_ be renamed. Yes, this breaks code, but the alternative is that PIL cannot be used with Zope. PIL predates Zope, so probably has precedence. If someone can suggest an alternative, I'm all ears... It's _really_ annoying to get bitten by this - _most_ stuff sort of works, and it's a complete pain to debug what's going on. Anthony -- Anthony Baxter <anthony(a)interlink.com.au> It's never too late to have a happy childhood.

2 1