June 2005 - Zope - Zope lists

Blank page problem
by Mike 18 Jun '05

18 Jun '05

Hello All, I'm currently running an intranet site using Zope and Plone and our users have been experiencing a very large number of blank pages (view source shows the html, head, and body tag, but that's it) on our site. From what I can tell, nothing relevent is appearing in the logs and all my attempts to catch them or atleast acknowledge that they happened show nothing. The blank pages are also immediate and are not consistent whatsoever. I've tried googling the problem, and have found a few threads that appear to be the same issue, but they've either gone unanswered or didn't have a solid solution. The product that by far creates the most blank pages for us is a custom one that executes code on our main server, and on average takes on average about 1 second, but can take up to a minute (rare) for a response. We currently use SOAP for this, but had the same problem when we were using ssh and rsh. We have about 800 users that have access to the system, and maybe 20-100 people on at any given time. The server is a dual 1.3gig machine running Mandrake Linux version 2.4.25 with 512MB of ram. We're completely at a loss on what to try to alleviate this problem, and are greatful for any help or insight anyone has to give. Thanks, Mike Patterson

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Zope programms for databases
by Ralph 18 Jun '05

18 Jun '05

I'm new to Zope and made a small database application with zope (mostly DTML) to learn the idea behind Zope, but I'm not satisfied with the structure of my application. I have for each table a Form (DTML-method) with 3 buttons (new,update,delete). Each button triggers a DTML-script "actionTable" actionTable calls either a DTML-method to display a form (update, insert) or calling the zsql-method to delete a data record. The disadvantage with this structure is, that it is difficult to maintain programs like this. I wish to have optimistic locking but to send variables to the next DTML-method is a hell. Example: I you have a database table with the rows id,name and desc I have to send all record values through all methods after the user is triggering update to secure that there is no concurrent update. But with my design approach it's not possible. Is there someone who has a better design approach or an idea?

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Problem with namespace
by Ralph 18 Jun '05

18 Jun '05

I have these objects: A is calling B is calling (D and E) My directory layout is: /map/ /map/sql /map/util /map/report/report1 /map/report/report2 /map/report/report3 Method A in "report1" is rendering B in "util". B is rendering a ZSQL-object in "sql" and in the tag <dtml-in> is rendering C (python-method) in "util", to render a table cell, but this isn't working, because E is unknown and I don't know why. Example: DTML-Method A: <dtml-in "sql.list_mytable" prefix="pre"> <dtml-var "util.B(index=pre_index)"> </dtml-in> DTML-Method B <td> <dtml-var expr="C(index=index)"> </td> Here is Zope breaking because Zope can't find method C. Could someone help? Ralph

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Re: [Zope] Passing parameters using DTML
by J Cameron Cooper 17 Jun '05

17 Jun '05

> John Poltorak wrote: > >> On Fri, Jun 17, 2005 at 07:09:04PM +0200, Dieter Maurer wrote: >> >>> Tino Wildenhain wrote at 2005-6-17 10:57 +0200: >>> >>>> ... >>>> Not at all. You could either have tried >>>> it out ;) Or looked at the DTML documentation >>>> in the Zope book *wink* ;) >>>> >>>> <dtml-var expr="somemethod(parm1=value1,parm2=value2)"> >>> >>> >>> Be warned: this is likely to cause loss of the namespace. >>> Do not forget to pass the two positional arguments (usually >>> as "None, _"). They are essential. >>> >>> For more details, read "Calling DTML Objects" of >>> >>> <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html> >> >> >> That looks useful. >> >> Is there also something which explains how to call ZPTs from a DTML >> object? >> >> I'm unable to pick up a passed parameter. >> >> This is what I've conjured up:- >> >> python:here.lib.parse_file(file=context.options['parm'],sepr=',',clone=1)"> >> >> hoping that "options['parm']" would get resolved as "ABC" but it >> doesn't. >> >> Any ideas? > When you call a ZPT like:: context.somePT(dog="beagle") you can get to it in the template like:: options/dog or:: python:options.dog or:: python:getattr(options,'dog') or maybe even:: python:options['dog'] Note that in the last two, I didn't need to know the name of the parameter at coding time, but could find it at runtime. If I have:: tal:define="att string:dog" then I can do:: python:getattr(options,att) The 'options' name is not contained in context. It is it's own first-class namespace. If 'parse_file' above is a ZPT, you can ask for options/file, options/sepr, and options/clone. --jcc -- "Building Websites with Plone" http://plonebook.packtpub.com/ Enfold Systems, LLC http://www.enfoldsystems.com

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Re: [Zope] Picking up a parameter in a ZPT
by Peter Bengtsson 17 Jun '05

17 Jun '05

On 6/17/05, John Poltorak <jp(a)warpix.org> wrote: > On Fri, Jun 17, 2005 at 04:33:28PM +0100, Peter Bengtsson wrote: > > Try > > python:here.parse_file(file=options['parm'],sepr=',',clone=1)"> > > Thanks for the suggestion, but I need to get the 'context' keyword in > there. > No. "context" is different from "options". context is the Zope namespace and options is a namespace that holds which parameters the template was called with. > I tried this > > python:here.parse_file(file=context.options['parm'],sepr=',',clone=1)"> > > but ended up with > > Error Type: AttributeError > Error Value: options > > Don't seem to be able to get the right syntax... > > John > > > On 6/17/05, John Poltorak <jp(a)warpix.org> wrote: > > > > > > I'm trying to work out how to pass parameters between various modules > > > running under Zope and have got stuck. > > > > > > In the line below, I need to replace the word 'links' with a variable > > > passed by the calling program > > > > > > > > > python:here.parse_file(file=context.links,sepr=',',clone=1)"> > > > > > > I know I can pass the variable using:- > > > > > > > > > <dtml-var expr="test2(parm='links')"> > > > > > > > > > Just don't know how to reference it under ZPT. > > > > > > > > > > > > Help! > > > > > > > > > > > > -- > > > John > > > > -- > > Peter Bengtsson, > > work www.fry-it.com > > home www.peterbe.com > > hobby www.issuetrackerproduct.com > > > -- Peter Bengtsson, work www.fry-it.com home www.peterbe.com hobby www.issuetrackerproduct.com

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IE v. Firefox for viewing Zope sites
by John Poltorak 17 Jun '05

17 Jun '05

I've just put together a simple Zope website, but whilst it renders properly under Firefox, it looks dreadful using IE. Can anyone explain why? Could it be the CSS? -- John

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Getting information about current method
by Jan-Ole Esleben 17 Jun '05

17 Jun '05

Hi! I am new to this list and rather new to Zope, so maybe this is a stupid question; unfortunately I haven't been able to find an answer to it anywhere: is there a generic way to find out from Python code which method has been called (in other words: find out where the current method is located in the ZOPE hierarchy and what its name is)? If I call an External Method via a DTML method, of course the REQUEST object contains the path to the DTML method because the External Method hasn't been called via HTTP. I haven't been able to figure out any other way of getting this information. Thanks in advance, Ole

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Picking up a parameter in a ZPT
by John Poltorak 17 Jun '05

17 Jun '05

I'm trying to work out how to pass parameters between various modules running under Zope and have got stuck. In the line below, I need to replace the word 'links' with a variable passed by the calling program python:here.parse_file(file=context.links,sepr=',',clone=1)"> I know I can pass the variable using:- <dtml-var expr="test2(parm='links')"> Just don't know how to reference it under ZPT. Help! -- John

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Call of TAL interpreter
by Simon ALEXANDRE 17 Jun '05

17 Jun '05

Hello Someone could tell me where I could find in Zope the following call : from TALInterpreter import TALInterpreter thanks a lot

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Re: [Zope] Python Scripts
by J Cameron Cooper 16 Jun '05

16 Jun '05

> We have been seeing a number of instances where python scripts fail > due to an apparent "syntax error" but the syntax is correct and simply > storing the method restores it to functionality. Anyone else seeing > this? How do you mean "fail"? Often times, if you have an error, save, test, and then use the back button, you'll see the old syntax error, even though the contents are the new (and correct) version. If you just revisit the script (click on the id in the breadcrumbs) the message will go away. --jcc -- "Building Websites with Plone" http://plonebook.packtpub.com

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