November 2000 - Zope

ZClass within ZClass
by Daryl Stultz 26 Nov '00

26 Nov '00

Hi folks, I am yet another Zope newbie. I am trying to create a ZClass hierarchy. Let's say I have a CDLibrary. Every CDLibrary has a CDManager (just one) and the CDManger holds all the CDEntry items. (The CDLibrary may have parts other than the CDManager, like a label maker or something- but that's not important now...) My question is this: How do I set up such a product with ZClasses within ZClasses. I have the HOW-TO collection, the ZBook, the Zope Book and the Guides. I've tried the HOW-TO on ZClasses and ObjectManagers, and Adding ZClass Instances Programmatically with no success. I am an experienced Python programmer with strong object-oriented knowledge and good HTML. Any help will be greatly appreciated. Thanks. -- "I ain't no stewin' rabbit, I'm a fricassein' rabbit. Have you got a fricassein' rabbit license?" Daryl Stultz - python, blender, robots, really bad harmonica playing... daryl(a)together.net RedHat Linux 6.1 - Dual Pentium Pro

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Re: [Zope] Python and EJB (J2EE)
by Hung Jung Lu 26 Nov '00

26 Nov '00

>From: Ender <kthangavelu(a)earthlink.net> >... Thanks for the comments. I'll reply other points in a few more days. >as for distributed technologies, while xml-rpc is useful and simple its >not useful (IMO) for enterprise programming, its too basic. This maybe true. However, HTML is also basic and simple, but exactly because of its simplicity, it became widely accepted and used. On the opposite end is CORBA: because it's so complicated, there is no vendor out there that can possibly implement all its features. Trading powerful features for a wider acceptance at times does work. SOAP is showing symptoms of becoming complicated. And that's a bad sign. See Fredrik Lundh's implementation comment for Python SOAP at http://www.pythonware.com/products/soap/profile.htm >Profile >Posted Jun 08, 2000 > >SOAP 1.1 is a highly modular and rather complicated standard. Supporting >every little nook and cranny is huge task, and since the specification is >still a moving target, we've decided to do this implementation step by >step. OK. Even the guru describes SOAP as "rather complicated", what then for the novices? I personally went through the SOAP protocol spec today and I had to agree it's "rather complicated". SOAP is going down the path of CORBA all over again. It's becoming COAP (Complicated Object Access Protocol). If not because Microsoft is behind it, I'd dump SOAP right away. Due to its simplicity, I'd say XML-RPC is here to stay, SOAP or no SOAP. It's unfortunate that the twin brothers have to fare good-bye, but at the same time I am glad that XML-RPC split off to remain simple. Future servers will have to handle both: more work, but that's fate. More on the other points later. regards, Hung Jung _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com

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Re: [Zope-dev] SQL-Methods Through-the-FileSystem
by seb bacon 26 Nov '00

26 Nov '00

Hi Johan, > Does anybody have a good suggestion how to > develope SQL Method ftfs (through the filesystem) > rather than ttw. > > Perferably in someway similare to the HTMLFile way try something like this: from Products.ZSQLMethods.SQL import SQL import PoPy def manage_add_user(self,email,password): conn = 'PoPy_database_connection' self.sql_add_user=SQL('sql_add_user', '', conn, 'email password', _sql_add_user) _sql_add_user = """ insert into tbl_users(email,password) values ( <dtml-sqlvar email type=string>, <dtml-sqlvar password type=string> ) """ hth, seb

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Special behavior or bug?
by Dany Rioux 26 Nov '00

26 Nov '00

Hi, yeah, I know, it's me again :) I've got this snippet in the standard_html_header hoping it would display the title of the calling document but instead displays the index_html's title... Is this the normal behavior? I know yesterday it was working... I tried refreshing the page but it's a no go. It simply refuses to put the correct title. It doesn't even put the header's file title... (something I guessed it would do the first time I tried it) Any opinion on that? ---<PASTE>--- <tr> <td align="right"><H2><dtml-var title></H2></td> </tr> ---</PASTE>--- ---.oo0O--------------O0oo.-------- Dany Rioux UnderSoft Inc. Business www.dating-reviews.com rdany(a)dating-reviews.com Personal www.drioux.com rdany(a)drioux.com -------.o00O-------O00o.-----------

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CURRENT MEMBERSHIP PRODUCT IS COOL -- was: [Zope] LoginManager / Membership / ZODB as UserSource
by Danny William Adair 26 Nov '00

26 Nov '00

Hello Bill, Now this _is_ cool. I had tried 0.75 in the past and had lots of problems. Version 0.78 is a real drop-in, like what I was dreaming of. Thank you very much for your efforts so far. I recommend the Membership product to everyone looking for a ready-to-use authentication and personalization solution, though ZODB based in the first place, thanks to ZPatterns and LoginManager it is always ready for rdbms. Btw, if you maintain a Membership version outside of the PTK, why do I see the word "Portal" so often? IMHO you shouldn't narrow down the opportunities of using this product to mere portals. CU+Prost, .oO( "Du konntest mal einen bauen" ) Danny -----Ursprungliche Nachricht----- Von: ucntcme [mailto:ucntcme]Im Auftrag von Bill Anderson Gesendet: Samstag, 25. November 2000 19:44 An: Danny(a)adair.net Betreff: Re: [Zope] LoginManager / Membership / ZODB as UserSource Danny William Adair wrote: > > Has somebody been able to setup this combination as for today? I guess this > is an easy one for the LM experienced... > I am looking for a completely ZODB based solution concerning membership, no > rdbms. It it still beta, but there is a membership product, which uses loginmanager. You can get it at http://www.zope.org/Members/Bill/Products/Membership It works quite well, despite the beta label. Bill Anderson -- E PLURIBUS LINUX

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PoPy and system tables
by Andreas 26 Nov '00

26 Nov '00

Hi, can anybody out there tell me why this query fails although PoPyDA is connected as postgres superuser ? select * from pg_class BTW: when I try this query I get no traceback :-( Postgres 7.02 PoPy 1.4.1 ZPoPyDA 0.7 Zope2.1.6 Linux 2.2.13 -- _________________________________________________________ Andreas Heckel andreas(a)aHIT.de

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manage_addFolder unusable from DTML-call?
by Kyler B. Laird 26 Nov '00

26 Nov '00

I have a simple DTML method: <dtml-var standard_html_header> <h2><dtml-var title_or_id> <dtml-var document_title></h2> <p> This is the <dtml-var document_id> Document in the <dtml-var title_and_id> Folder. </p> <p> Welcome, <dtml-var AUTHENTICATED_USER>! You have these roles: <dtml-var "_.string.join(REQUEST.AUTHENTICATED_USER.getRoles(), ', ')">. </p> <dtml-call "manage_addFolder('Folder', 'my new folder')"> <p> I created a folder! </p> <dtml-var standard_html_footer> It requires "Manager" to view. When I run it with the <dtml-call> commented out, it correctly returns my role as "Manager". I can go through the management interface to create and destroy folders, but as soon as I view this method, (it tries to reauthenticate me and) I get: Zope Error Zope has encountered an error while publishing this resource. Unauthorized You are not authorized to access manage_addFolder. Traceback (innermost last): File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/ZPublisher/Publish.py, line 171, in publish File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: make_folder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: make_folder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/OFS/DTMLMethod.py, line 172, in __call__ (Object: make_folder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/DocumentTemplate/DT_String.py, line 528, in __call__ (Object: make_folder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/DocumentTemplate/DT_Util.py, line 331, in eval (Object: manage_addFolder('Folder', 'my new folder')) (Info: manage_addFolder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/OFS/DTMLMethod.py, line 194, in validate (Object: make_folder) File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/AccessControl/SecurityManager.py, line 139, in validate File /data/www/Zope/42/Zope-2.2.4b1-src/lib/python/AccessControl/ZopeSecurityPolicy.py, line 183, in validate Unauthorized: (see above) I expected trouble when trying to use proxy roles for this, but it seems like running as a Manager should be simple. I see a similar DTML method in use in a message from early October. Am I missing something or did the security model change get me? Thank you. --kyler

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Access to Python arrays
by Edward Muller 26 Nov '00

26 Nov '00

I am working on a product in which one of the objects keeps an array. I've already overcome the problems with making the array persistent (i.e. by not using .append, but intead re-assigning the array each time). Anyway...I digress.. So I have this object that has an array..A folder may contain several of these items, so I loop over them in DTML like this: <dtml-in "objectValues('My Object')"> <dtml-var id> </dtml-in> This prints out the id of each of my objects. But I ALSO want to print out the contents of the array, indented after each instances id. What is the best way to do this in DTML? Is there as way? Lets say for arguments sake that each array element is a string, how do I iterate through the array and print the strings. Lets say each element in the array is anothe array (of 5 elements), How do I loop over the array and pull out the sub arrays and print those five elements? Any help/direction would be appreciated, I've checked the docs and refered to some sample products but I either missed something obvious (probable) or It's hard..or something :-) -- ...EAM... edwardam(a)home.com edwardam(a)handhelds.org ----------------------- 'It's because crappy programs offend me.' --Eric Raymond Grow a ponytail -- view it as your telepathic antenna to other Linux Kernel Developers. -- Jeff V. Merkey

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j2ee & zope
by alan runyan 26 Nov '00

26 Nov '00

Ender pretty much summed everything I could say about J2EE and Zope. but I can tell you why we chose EJB/BEA at our company rather than something like ZOPE/OpenMerchant/PHP/etc. 1. we are consulting firm and we need to be able to leave a client. ZOPE could (at the time, and I believe still can) can get pretty hairy and there just are not that many people who can grok high brow ZOPE. There are plenty JAVA programmers, with years of experience. The J2EE standard is just a set of API's Sun has set up for java programmers to work with. The underlying implementation of the API and brand name is why you chose WBELOGIC over WEBSPHERE, or vice versa. 2. as others said in the previous posts: MessageQueueing, JDBC (this is significant, I still cant get the DCOracle to work), Transactions, Documentation (javadoc of j2ee), Distributed Objects (EJB's - entity beans have their place, but session beans usually most common approach to business logic), Persistence (entity beans are rarely used, ASAIS) and a Security model (pretty complex and confusing -- but acquisition and security can get pretty hairy as well). 3. ZOPE has quite a lot of flexibility, but as far as implementing a exchange or large transaction heavy site, I just wouldnt do it. I am pro-ZOPE all the way, but there has been very little (?) experience with building distributed systems w/ ZOPE and the community experience (I would imagine) leans more to Content heavy - simple transaction based websites. 4. Integration. it would be nice to have ZOPE integrate w/ J2EE (via J2EE connectors?). What I see as ZOPE's huge win is content management. ZOPE is a inclusive system that integrates poorly w/ external systems (IMHO). you must hack up wget w/ custom scripts of rolling back. (you can not push a button and say 'all marketing information is approved' - then it goes to the staging server, then what happens if you have created another version, and have packed the ZODB?) there is no way of reverting back to a historical version if you pack the database. The PTK works fine for ZOPE.ORG, but how many businesses run their shop like zope.org? I havent seen many paradigm except ZOPE.ORG or memepool.com that could work like the PTK is targeting (autonomous people posting content, how do people share documents/content?). 5. Experience. not many people have had much experience (except DC) integrating ZOPE w/ large systems (anyone?). The reason why lots of these questions are coming up is because, a larger group of people are doing more with ZOPE. using it in situations where people have not even thought about putting it. I am fascinated by the system, but once you try to plop things on the filesystem and let ZOPE work in the background (role of CMS, not webserver) things start coming apart at the seams, the idea of versioning and rendering stuff out to the filesystem(how?) and then pushing it around the testing->staging->production environments-- there is no 'best practices' regarding using ZOPE as a seperate external tool (forget this all inclusive stuff - thats why Vignette is getting a bad reputation). most of ZOPEs ideas are interesting. and ZOPE wins in a lot of areas: ease of use, pre-built web interface, zClasses (great idea), ZODB (cool, but gets in the way sometimes, when you just want a filesystem), Security model (already there, on the web interface, a great easy-win), XML-RPC, and 3rd party products (LocalFS comes to mind)! I just would like to know how people used it when its a external tool, and trying to integrate it w/ JSP/ASP/PHP/ETC. ~runyaga

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Re: [Zope] Access to Python arrays
by morten＠esol.no 26 Nov '00

26 Nov '00

> I am working on a product in which one of the objects keeps an array. I've > already overcome the problems with making the array persistent (i.e. by not > using .append, but intead re-assigning the array each time). Anyway...I > digress.. This sounds a bit awkward, if you could post some of the code (or release an alpha version of your product, that'd give us a context..). > This prints out the id of each of my objects. But I ALSO want to print out the > contents of the array, indented after each instances id. What is the best way > to do this in DTML? Is there as way? Lets say for arguments sake that each > array element is a string, how do I iterate through the array and print the > strings. If your class is defined somewhere along these lines: class myclass(Persistent, Yadayada, yada): def __init__(self, id, body): self.id self.body you could easiliy display the body of the object within the dtml-in loop using the same approach as with with id, <dtml-var body>. If you're wondering how to display _the entire object_, then defining a __call__ would probably be the right thing, and you could do the loop like this: <dtml-in "objectValues('My object')"> <dtml-var sequence-item> </dtml-in> > Lets say each element in the array is anothe array (of 5 elements), How do > I loop over the array and pull out the sub arrays and print those five > elements? Easy enough: <dtml-in "objectValues('My object')"> <dtml-in "_['sequence-item'].sequence_like_object"> This is the contents of one of the array elements contained within an object with meta type <dtml-var meta_type>: <dtml-var sequence-item> </dtml-in> </dtml-in> > Any help/direction would be appreciated, I've checked the docs and refered to > some sample products but I either missed something obvious (probable) or It's > hard..or something :-) Well, hope this helps then. I'd also recommend reading the Python tutorial, and other introductory Python material, if you're not familiar with it. -Morten

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