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ZClass and Propertysheets
by Andy Pahne 30 Aug '00

30 Aug '00

Hi, I have created a ZClass with a propertysheet called "Basic". I added a property "db_id", integer value with a default value of 0. Then I created two instances and changed the value to 1 in the first and 2 in the second instance. When I try to render the property with a <dtml-var db_id> I get a 1 in both instances. That's not what I expected in the beginning. In particular not because there doesn't seen to be anything wrong when I have a look at the property sheet in the instance's management screen. I have different values there. Am I wrong or is there something wrong with Zope 2.2.1 and ZClasses? Andy Pahne ap(a)big1.de

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RE[3]: [Zope] Product inheritance question. ==> Pb. moving clas s from a product to another + etc. s from a product to another + etc.
by NABETH Thierry 30 Aug '00

30 Aug '00

Hello, >> If it is a class method, it must be inherited by any derived class. This is what I had done. However, I had the time finally to conduce the following tests. - create a Product P1 (Note: I used the word "package" instead of Product in my previous postings) - create a Class A in P1 - create a method z in the Class A - create a Product P2 - create a Class AA that inherits A in product P2. - create an object 'o' instance of Class AA. - make the test of calling the method z on 'o'. Results: everything works fine !! So everything seems to work correctly with the new version. However, when I try to do the same (create a method z and test) for Packages that I had created in the previous version of Zope, it just does not work !! (I have imported in the new version the class I had created in the previous version). I believe that this had to do with the trick I used to split and existing Product in several Products: Since I could not move a class directly from a package to another, I created 2 copies of the same packages. I deleted from the first package the class I wanted to move. From the second package, I deleted the classes I didn't want to move. The result was 2 packages with each the correct set of classes. The problem is that this seems to have generated some kind of inconsistancy, in particular related to the namespace: the second package do not have access to the namespace of the first package. I know this was a relatively ugly way to proceed, but I found at that having a zillion of classes in a same package was even more ugly, and I needed to reduce this complexity by introducing more modularity. Of course, at the beginning I couldn't predict which Products and which classes would exist and I decided to start with one package and split it later. If you had nor noticed I used some kind of incremental/prototypical/evolutionary/blablabla methodology. Unfortunatly, not being able -- to move classes from one product to another -- makes the use of this methodology problematic :-(. Another similar problem is that you can not modify a posteriori the inheritance tree. (for instance when you decompose a class into 2 subclasses that inherit from one another). To conclude, I find Zope to be a very interesting systems (because it is dynamic, object-oriented, integrate seamlessly an OO database, etc.). However, it would be an even better system if it provided more flexibility to reengineer an architecture. (very important when you use a prototypical approach). Or perhaps, there is something I have not understood ? Thierry Nabeth Research Fellow INSEAD CALT (the Centre for Advanced Learning Technologies) http://www.insead.fr/CALT/ -----Original Message----- From: Dieter Maurer [mailto:dieter@handshake.de] Sent: Monday, August 21, 2000 10:47 PM To: thierry.nabeth(a)insead.fr Subject: Re: RE[2]: [Zope] Product inheritance question (similar question) NABETH Thierry writes: > What I will have to do: > - create a Package (Zope product). > - create a class in this package, and a method (my_method) This should be a method of the class, not a method in the packages. If it is a class method, it must be inherited by any derived class. Dieter -----Original Message----- From: NABETH Thierry Sent: Friday, August 18, 2000 9:29 AM To: 'zope(a)zope.org' Subject: RE: [Zope] Product inhetitance question (similar question) And what happen if the Class A is in a package PA. Clabb B is in a package PB. How do you access the namespace of PA from PB ? When I have tried, the inherited methods from A where not visible from B, and I and to recreate a copie of the method. (which is ugly !!!). Any suggestion ? Thierry Nabeth Research Fellow INSEAD CALT (the Centre for Advanced Learning Technologies) http://www.insead.fr/CALT/

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Generic Workflow Products?
by Cary O'Brien 30 Aug '00

30 Aug '00

After applying Zope to a couple of in-house projects (which turned out pretty well, thank you), I've started to come to the realization that many applications boil down to workflow management. A job comes in, attributes get set, things get attached to it, and it gets passed from person to person (to machine, in some cases) as it flows through the system. I guess to start out it would need the following: -- user classes -- job creation -- job attributes, with protection from view and modification depending on user classes -- multiple job queues, with access control, and some sort of priority. Queues may end up being implemented simply by having a job state, sequence number, and priority, and moving from one queue to another would just be changing the state. -- job timeouts for escalation, -- e-mail "ticklers" and notification -- job routing based on attributes and actions. -- some sort of api other then HTTP/HTML for external programs to access jobs, perform actions, and update jobs. -- Extra Credit: Graphical workflow editor. -- (what else am I missing) Sounds like a job for Zope, doesn't it. Basically I've implemented a couple of systems like this, either classic database-driven or z-class driven. But I'm tired of re-inventing the wheel. It would be nicer if systems like this could be implemented at the "workflow logic" level rather than the Zclass level. IE a set of ZClasses or Product classes that implemented workflow systems. Is there such a thing? Has anyone worked on such a thing? Any ideas how to implement such a thing? I've got a couple of modifications to an existing system coming up, which sounds like just the excuse I need for a total rewrite :) -- cary

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Can't connect Zope FTP under NAT
by Patrick Hsieh 30 Aug '00

30 Aug '00

Dear folks, I can't connect remote Zope FTP Server when I use the reserved IP udner NAT. If I use public IP, the connection is ok. Is there any solution? -- Patrick Hsieh<pahud(a)python.nu> Cyberwork Solution Inc., System Engineer http://www.cyberworksolution.com TEL: 0933201800

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Re: [Zope] The tree tag, SQL and what should be simple
by Ian J Cottee 30 Aug '00

30 Aug '00

"Rik Hoekstra" <rik.hoekstra(a)inghist.nl> writes: > Unless I do not quite understand you I think you missed Anthony Baxter's > tree_and_sql howto > (http://www.zope.org/Members/anthony/tree-coding-tricks ). It will probably > give you either exactly what you want or enough ideas to get you further. Hi Yes, I looked over that document and unfortunately it doesn't help me. It talks about a *one* file structure where each item in a file can be related to another item. I'm looking at a simple two file structure of records and categories and being able to display those categories in a shallow, two level tree. I've given up for the moment and written my display screen in a way which probably makes more sense but I'd still be interested to know for the future how it works Cheers Ian

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ZMenu 0.1.0 released
by Hugo Ramos 30 Aug '00

30 Aug '00

Yellow ppl, ZMenu is a complete navigational system that uses a tree like display. It allows you to dinamicly add a navigational link menus system to your site. This ZClass based product is still in a development stage and I'dd like to have some feedback about it... so email me about any problems or sugestions. You can download it here (there is also a pic): http://www.zope.org/Members/hramos/products/ZMenu regards ===== Hugo Ramos - hugo(a)zopers.org ZopersORG - http://www.zopers.org ===== Do not meddle in the affairs of programmers, for they are easy to annoy, and have all the source code!!!

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inserting or modifying REQUEST.form objects ???
by Brian Withun 30 Aug '00

30 Aug '00

Can objects be added to or modified in the REQUEST.form? I can add/modify objects in REQUEST as in: expr="REQUEST.set('myVar',3)" but I can't seem to do this for the REQUEST.form dictionary... expr="REQUEST.form.set('myVar',3)" <- error expr="REQUEST.form['myVar']=3" <- error Neither the DTML-like or Python-like syntax seems to work. ..is there some syntax which can modify (in place) or add things to REQUEST.form? Is REQUEST.form READ-ONLY for some reason? ------------ Brian Withun

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Re: [Zope] FTP crashing Zope?
by Adam Karpierz 30 Aug '00

30 Aug '00

>Dario Lopez-KXsten wrote: >> Is this a bug in latest Zope (2.2.1) or is this expected behaviour? If, the >> latter is the case, what can I do to a) turn off FTP access, b) make sure >> that my Zope is up and running automagically after a crash? > >Ewww.. this seems quite nasty :( > >If you can reproduce this, I'd stick it with a really detailed >description into the collector.... > >Has anyone else seen this? Unfortunately I do... :( Crash occurs when I try to use various FTP command during using telnet on port 8021 and when I type QUIT command immediately _after_ _initialize_ data transmission. Of course I didn't able to seen any data on telnet console (data transmission port is assigned automacically and quite different then control port). More precisely, crash (Python crash) happend immediately after sequention: RETR index_html QUIT I try reproduce this error once or twice but without effect. Before crash I (if remember precisely) was trying: RETR index_html ABOR QUIT several times and don't happened something wrong. PS: I dont remember if crash occurs in PASV mode. -- Adam Karpierz karpierz(a)alpha.pl

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RE: [Zope] Versions...
by Chris McDonough 30 Aug '00

30 Aug '00

Versions are problematic in combination with mounted storages in particular because there is no link in versioning between storages. You can easily create a versioned object in one storage, then traverse to another part of the instance space that's been mounted and use that version cookie to make a change. But you need to commit the two versions separately. If you commit one of them, you'll be left scratching your head as to why the other storage didn't commit. I'd say in this particular that it's perhaps a limitation of mounted storages rather than versions. > -----Original Message----- > From: Chris Withers [mailto:chrisw@nipltd.com] > Sent: Wednesday, August 30, 2000 8:28 AM > To: Chris McDonough > Cc: 'Roman Milner'; zope(a)zope.org > Subject: [Zope] Versions... > > > Chris McDonough wrote: > > Mounted storages fall down with versions (do not use versions in > > conjunction with mounted storages, it will do bad things to you). > > Is it just me or are versions not exactly the most robust > things around? > > (I'm thinking external methods here, and ftp access into a version, > amongst others ;-) > > cheers, > > Chris > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) >

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RE: [Zope] How to logout users when using LoginManager?
by Chris McDonough 30 Aug '00

30 Aug '00

It's: <dtml-raise Unauthorized> You are not authorized. </dtml-raise> > -----Original Message----- > From: Chris Withers [mailto:chrisw@nipltd.com] > Sent: Wednesday, August 30, 2000 8:48 AM > To: bkc(a)murkworks.com > Cc: zope(a)zope.org > Subject: Re: [Zope] How to logout users when using LoginManager? > > > Brad Clements wrote: > > Can anyone share some tips on how to logout users from a web page, > > using cookies or otherwise, allowing them to relogin as another user > > without having to quit/start their browser? > > Well, with cookies, it's simple: delete the cookie. I think > most fo the > Login-type stuff has interfaces to do this for you (like the > logout link > on zope.org) > > With Basic Auth it's a bit tricky. Basic Auth really only works 'cos > browsers cache your username and password and send it each time you > request a new page that it thinks those details apply to. So you just > have to persuade the browser to stop cachign that info ;-) > > I think you can do something like: > > <dtml-raise Unauthorized> > > which works on most of the browsers around. I don't know > though, maybe I > got the syntax wrong :S > > cheers, > > Chris > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://lists.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope-dev ) >

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