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What does context.registerBaseClass() do ???
by Daniel Rusch 24 Aug '00

24 Aug '00

I have searched the FM's and I cannot find anything on context.registerBaseClass(). Can anyone explain what this does for me and what the syntax of the argument list should be????? Thanks, Dan

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Re: [Zope] Acquisition, Not! How?
by Dieter Maurer 24 Aug '00

24 Aug '00

=?ISO-8859-1?Q?J=FAlio?= Dinis Silva writes: > I know this sound strange but is there a way to, > during execution of a dtml method, when a with tag is used one > force acquisition not to be used? It is possible -- with an external method. But probably, you should not do it. It may have strange side effects. Zope uses acquisition for access validation. If you cut the acquisition chain, Zope may no longer find the acl_user necessary to determine the identity of the current user and its roles. You may get unexplanable Unauthorized exceptions. Okay, you may try it yourself: the external method: def getBase(obj): return getattr(obj,'aq_base',obj) it returns "obj" with all acquisition context removed. As indicated above, I would not use it, but instead use a test function: def hasattr_base(obj,attribute): base= getBase(obj) return hasattr(base,attribute) I would use this to test in DTML whether a object "O" has itself at attribute "a" which is not acquired and raise an exception, if not. Dieter

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Re: [Zope] strange login behaviour
by Dieter Maurer 24 Aug '00

24 Aug '00

Didier Georgieff writes: > I have really simple login wich is a link to a Method "login" wich > comprise > > ....... REDIRECT for login > <dtml-call "RESPONSE.redirect(baseURL)"> > > and 'login' method has NO autorizations for anonymous. > > It redirects me on the right "baseURL" page, but the "baseURL" > inludes an "info" Document with > > <dtml-var "AUTHENTICATED_USER.getUserName()"> > <dtml-in "AUTHENTICATED_USER.getRoles()"> > > who shows ONLY anonymous after the first login.. > > IF I do a second login (exactly the same) then it works fine and i > got the right Names and Roles.. I am not sure... ... but it might be possible that the browser sets a cookie only after the redirect. I saw a comment in GUF (Generic User Folder, a Zope product for cookie base authentication) about the necessity of a double indirection because cookies might not be set during authentication. This would point into the above direction. I must admit, however, that I did not really understand the GUF comment. Dieter

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Re: [Zope] Missing pictures
by Dieter Maurer 24 Aug '00

24 Aug '00

William JOYE writes: > I have notified that every time on my web page one picture is missing (with > IE and Netscape). When I refresh the page there is another picture missing > and the first is OK. After another refresh, the first is missing and the > second is OK. And so on... > > I use Apache and Zope 2.1.6 under Linux. In the Apache log, I have notified > that http code is always 304 but when pictures are missing in web page the > transferred size is '-' and no '0'. Interesting! Recently, I tried to locate a very similar (though not that well reproducible) problem. It may well be the same problem. My problem really confused me: Netscape showed a broken image for each "reload". When I verified the Zope result with an httplib application (this is a Python module to generate HTTP request), I got a perfect 304 response. No hint whatsoever on any Zope problem. Print statements in "OFS.Image.index_html" demonstrated that Zope received a request with an "If-Modified-Since" header and that it decided that it has no newer image. Thus, it responded with status 304. This is correct. When I did a forced reload (i.e. Shift-Reload), the image was shown correctly. From then on, a normal reload showed the image correctly, too. The forced reload leads to a request without "If-Modified-Since". For such a request, Zope returns the image in a standard status 200 response. I can only make some sense of this, when I assume that somehow Netscape has associated the image with the broken image in its cache. I was determined to track this problem down at home. However, I was unable to reproduce it. This is to be expected when the problem has to do with the browser cache. Of cause, it is different at home than at work. However, many people report similar problems. So, probably, Zope sometimes does something strange with images that confuses browsers, maybe let them associate an image permanently with a broken image in their cache. Because the behaviour you reported seems to be reproducible, we may have a change to determine the cause. If you are willing to track this problem down, I may give some hints about instrumentation and maybe debugging. Dieter

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gvib
by Bob Tierney 24 Aug '00

24 Aug '00

I forgot to mention that the 0.9.2 version contains a Windows DLL contributed by Brad Clements. Sorry about that. Regards, Bob _________________________________________________________________ Robert E. Tierney EMail: bob.tierney(a)goingv.com Going Virtual HTTP: www.goingv.com 10800 Independence Pointe Pkwy Phone: 1-704-849-0731 x109 Matthews, NC 28105 Fax: 1-704-849-2279 AIM: RETierney _________________________________________________________________

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gvib
by Bob Tierney 24 Aug '00

24 Aug '00

Hello everyone! We released version 0.9.2 of the gvibDA Interbase database adapter. This version is a bug fix release. The new version can be had at http://www.zope.org/Members/RETierney/gvibDA. Thank you. Bob _________________________________________________________________ Robert E. Tierney EMail: bob.tierney(a)goingv.com Going Virtual HTTP: www.goingv.com 10800 Independence Pointe Pkwy Phone: 1-704-849-0731 x109 Matthews, NC 28105 Fax: 1-704-849-2279 AIM: RETierney _________________________________________________________________

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Corruption caused by 'Pack'?
by Marcin Kasperski 24 Aug '00

24 Aug '00

After using succesfully zope for some time I decided to cut a bit the database size. So I went to Control Panel/Database and clicked "Pack" for objects older than 10 days. At first everything seemed to work (I returned to the management screen seeing new - smaller - Data.fs size), but when I tried to preview my pages, terrible things happened - most pages turned to be not available, instead of seeing them I saw zope errors with useless descriptions like 'Zope error: error' etc (restarting browser and zope did not helped). Happily, during the process, the Data.fs.old file was created - stopping Zope, removing all Data.fs.<sth> and overwritting Data.fs with Data.fs.old returned zope instance to the previous state. So I will not click 'Pack' anymore. Has anyone notified similar problems? What could be going on? I use binary zope 2.2.0 distribution for Linux. The database has been created and always used with this distribution (just a few weeks ago) and has never been packed. The time on the machine seem to be correct (although IIRC there happened a moment a few weeks ago when it was for the short time incorrect). I use some custom ZClasses installed as a product developed within 'this' Control Panel/Products. By the way: to decrease database size I consider: - creating new Data.fs served via another (temporary) Zope instance (via just copying Data.fs.in) - exporting everything important from my current instance - importing those files into new instance - copying new Data.fs over the old one (of course each Data.fs copying is performed while both Zope's are shut down). Will it work as expected? Will I loose anything apart bobobase_modification_time? -- Serwis dla programistów z kącikiem mieszkaniowym: http://www.mk.w.pl | | You have the right to change your mind, to substitute functionality, | and to change priorities. (Ken Beck's Third Customer Right) |

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Re: [Zope] The tree tag, SQL and what should be simple
by Dieter Maurer 24 Aug '00

24 Aug '00

icottee(a)bluefountain.com writes: > I have a table for chickens.... > And another table for types.... > > Each chicken has a type associated with it. At the end of the day I want to > display the chickens underneath the type it has ... start the screen up it would > say > > + BIG > + MEDIUM > + SMALL > > And the users can then expand to see the chickens available in each category. > > + BIG > - Flossie > - Wombat > - Hank > + MEDIUM > - Debbie > - Fruitbat > - Harold > + SMALL > - Bob I think, I have a solution for you, but it is a bit tricky and you must fill out the details. I am not sure, it will work. Let's show the picture. You have two Z SQL methods: one for the top level (i.e. type table) without parameters, one for the chicken level with parameter type. You have a DTML method "branches". It should determine the branches in the current context. It looks at the variable "tree-level" to determine whether it must call the type or the chicken Z SQL method. If you need to use the chicken Z SQL method, you are in a context that knows the current type. You call the method with something like: <dtml-return "chicken(type=type)"> You may need to adapt the names to your case. Good luck Dieter

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Re: [Zope] The tree tag, SQL and what should be simple
by Rik Hoekstra 24 Aug '00

24 Aug '00

> > >I thought this was going to be simple but having read numerous postings on the >mailing list and all related HOW-TOs I can find, I think I can confirm I am >stuck. This is sad because I've just spent a very productive couple of days with >Zope and MySQL making the world a better place. > >I have a table for chickens. Basically it looks like this <snip sql> >It would appear that I need to feed two things to the dtml-tree tag. Firstly my >starting levels (my types) and then the related data underneath but I can only >feed one SQL query to the tag. All the stuff I read seems to assume the info at >the top level comes from the same file (and from a key id). How do I do this or >indeed, is it possible? I have a nasty feeling I am missing something obvious. > 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. hth Rik

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Where do I find out about cookies?
by Jean Jordaan 24 Aug '00

24 Aug '00

Hi Zopers It looks like I'm going to be using cookies now, and I don't find any How-To on cookies. What's the most instructive place to look? "UTSL" is fine as an answer, especially if it points me somewhere, and even more if it's DTML source .. The *ZQR* is a bit too cryptic for me. The *DTML Ref* has a bit more:: 8. Dictionaries are objects that support looking of data by name (e.g. REQUEST.cookies['CUST_ID'] to look up a cookie named CUST_ID). Dictionaries have has_key methods for checking whether a dictionary contains a value (e.g. REQUEST.cookies.has_key('CUST_ID') ) and methods keys , values , and items , for updating lists of dictionary keys, values, and key-value pairs (e.g. REQUEST.cookies.keys() to obtain a list of cookie names). .. but I don't understand yet how 'keys', 'values' and 'items' are going to help me *update* the lists -- it seems to refer only to querying them, AFAICS .. -- Jean Jordaan -- technical writer -- Mosaic Software -- Zope 2.1.6 on WinNT and W2K

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