March 2000 - Zope - Zope lists

Zope Consulting in the UK?
by Ian Sparks 11 Mar '00

11 Mar '00

Hi, Being UK based myself I wondered if there are any UK Zopistas who work for web-design/application development houses? Do UK web-design shops have a clue about Zope? - Ian Sparks.

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dtml-var behavior
by Sin Hang Kin 11 Mar '00

11 Mar '00

I got a quoted version of the object if I made <dtml-var this> It does not evaluate the tags and quoted all < with < and so they all showed on the browser. What rules determine when it will be quoted? Also, I got the same result if I have <dtml-var "folder.obj"> I can work around with <dtml-with folder> <dtml-var obj> </dtml-with> But how can I workaround "this"? Rgs, Kent Sin

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ZClass, Base Classes and logic (QUEST)
by Oscar Picasso 11 Mar '00

11 Mar '00

Hi, Most of the time when someone complains about DTML syntax or the learning curve and so on, the answer is we should code our logic in python if we know this language. That's what I am trying to do because I love Python. However, many times I don't know how to import my logic in Zope. example: I wrote a very simple module MyTest.py: ################################## class SuperClass: def __init__(self): self.a='This is a in SuperClass' class MyClass(SuperClass): def __init__(self): SuperClass.__init__(self) self.b='This is b in Myclass' ################################## In the python interpreter I do the following things: >>>import MyTest >>>import MyTest.MyClass >>>t=MyTest.MyClass.MyClass() >>>t.a 'This is a in SuperClass' >>>t.b 'This is b in Myclass' That's what I expected. Now I intall the package in zope. I make a ZClass which only Base class in MyClass. Its metatype is MyClassClass, so it appears on the popup menu near the Add button. But when I try to add an instance I get the following message: Error Type: TypeError Error Value: unbound method must be called with class instance 1st argument I guess that the problem is the line SuperClass.__init__(self) ==>however I don't understand why it works fine with the python interpreter and why not in Zope. Others behaviors of Zope: suppose i add the following line in the MyClass __init__ function: self.d='I am d' No problem when I run it with the interpreter: >>>t.d 'I am d' In zope: <dtml-var "MyClassInstance.d"> renders: Error Type: AttributeError Error Value: d I get the right value of d only with the new instances of MyClass. On the other hand if MyClass has a property sheet, all the instances are updated if change the property sheet. ==>So again, why these differences in the behavior of ZClass instances depending of which part we modify (the python Base Class or the Zope ZClass)? I really love Zope but I prefer code in python. However I hit often the wall when I try to put the pieces together. I think that speaking about documentation : clear API docs would be, for me the most important. What behavior could I expect from the differents parts of Zope. Example of docs I find useful with other 'languages': Python Library Reference Java API documentation

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here indicator with tree
by Andy Heath 11 Mar '00

11 Mar '00

given a tree widget with links on the branches how could you arrange for some small image to be loaded next to the branch when you click on it so as to indicate where in the tree you are )the links display info in another frame). Andy -- ------------------------------------------------- Andy Heath a.k.heath(a)open.ac.uk The Open University +44 (0) 114 2885738

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Python Class Question
by Daniel G. Rusch 11 Mar '00

11 Mar '00

Let's say I have a class called Chicken in a file called Chicken.py Now let's say I want to add a method called getSize() to the Chicken class. It's a piece of cake to add the method in the Chicken.py file. But, is it possible to add the method to the Chicken class, but have that method in a different file, i.e. some file other than Chicken.py? Thanks, Dan

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Re: [Zope] getting object reference from an id string?
by Siggy Brentrup 11 Mar '00

11 Mar '00

"Darran Edmundson" <Darran.Edmundson(a)anu.edu.au> writes: > Say one has an object reference and knows the > string id of a child node. From this info, we > want an object reference to the named child. Correct me if I misunderstand you completely, but what's wrong with <dtml-call "REQUEST.set('desired_ref', known_ref[desired_id])"> Siggy -- Siggy Brentrup - bsb(a)winnegan.de - http://www.winnegan.de/ ****** ceterum censeo javascriptum esse restrictam *******

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Zope in chroot enviroment
by dillera＠isc.upenn.edu 11 Mar '00

11 Mar '00

Is anyone running this? Can it be done? Can Zope be frozen? Is there a way using Apache and not Zserver, or is this impossible? -andy diller

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Re: [Zope] Is Zope syntax inconsistent ?
by Tres Seaver 11 Mar '00

11 Mar '00

Glyph Lefkowitz <glyph(a)twistedmatrix.com> > > On Fri, 10 Mar 2000, Phil Harris wrote: > > > As someone earlier today on the list said, "if it's in quotes it's python" > > (or something similar). > > > > Basically Python rules apply when using any expressions in zope dtml-var > > and other tags. > > I still think it's an inconsistent syntax. It should be possible (by > overriding __coerce__, I think? I haven't had time to look this up yet) > to make the == operator do something different. AUTHENTICATED_USER is > often used as a string (at least what I've seen of it ...) When in doubt, read the fine manual. The _actual_ syntax you are using is:: <dtml-var name="AUTHENTICATED_USER"> which can be abbreviated (and is, by almost every Zopista) as: <dtml-var AUTHENTICATED_USER> The "name" form of the var tag is the "preferred" one, for the types of applications DTML is really designed for: simple scripting of objects built in Python. It does several "automagic" things with the name: - If it is callable, calls it, passing the current object, the current namespace, and the REQUEST; it then replaces the object with the result of the call. - If it has a string coercion (__str__) method, calls that and replaces the object with the result. This behavior is the Right Thing (TM) for simple scripting; but it _isn't_ Pythonic (the automagic stuff smells more Perlish, really). The "in quotes" version is really:: <dtml-var expr="AUTHENTICATED_USER"> but can also be spelt (and mostly is):: <dtml-var "AUTHENTICATED_USER"> The "expr" form of the var tag evaluates the Python expression (in this case, to the object AUTHENTICATED_USER). For fairly obvious security reasons, the evaluation takes place inside a restricted namespace, without the usual builtins; the "safe" builtins are made available as members of the "_" namespace. > > Also, "if it's in quotes it's in python", why do I need to do _.str()? > why does dir() not work? It seems like some pretty horribly munged sort > of python... > > > > I would expect an object to behave consistently wherever it was used - so > > > if it renders/returns/evaluates to 'zope' inside a dtml-var I would expect > > > it equally to render/return/evaluate to 'zope' inside a dtml-if. > > > > If it doesn't then surely we have an inconsistent syntax. How do we know > > > how any object is going to behave inside a dtml tag ? The simplest disambiguation possible is to cease using the shortcut forms, and always spell what you really want: <dtml-var name="AUTHENTICATED_USER">  or <dtml-var expr="AUTHENTICATED_USER.getUserName()">  Hope this helps! Tres. -- ========================================================= Tres Seaver tseaver(a)palladion.com 713-523-6582 Palladion Software http://www.palladion.com

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Zope under low Disk Conditions
by Andrew Kenneth Milton 11 Mar '00

11 Mar '00

I've just had a few frustrating hours trying to work out what was going on with Zope. It stopped allowing the addition of DTML-Methods. The connection would just hang waiting for the Method to be created (also happened with DTML-Documents). Turns out that /tmp was out of space temporarily. -- the disk that Zope was running on had plenty of space. It'd be nice if it would return low disk space errors rather than go off into never-never land. -- Totally Holistic Enterprises Internet| P:+61 7 3870 0066 | Andrew Milton The Internet (Aust) Pty Ltd | F:+61 7 3870 4477 | ACN: 082 081 472 | M:+61 416 022 411 | Carpe Daemon PO Box 837 Indooroopilly QLD 4068 |akm(a)theinternet.com.au|

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REQUEST vraible methods
by Chris Withers 11 Mar '00

11 Mar '00

Hi, I'm trying to write a SiteAccess Rule to do some simple virtual hosting helping. Basically, I'd like to have access from http://www.mydomain.com (which is virtually hosted...) and from http://zope-host.nipltd.com/mydomain (the actual Zope host) and have all the management views, absolute_url()'s, etc working properly. If you just drop a SiteRoot in /mydomain then everything works fine through http://www.mydomain.com but http://zope-host.nipltd.com/mydomain/manage just jumps to http://zope-host.nipltd.com/manage. So I'd like to write my own Access Rule to do this. Now, the documentation for SiteAccess mentions a few methods of the REQUEST object that I can't find documentation for. I was wondering where I could find complete documentation for the REQUEST object, or how I can find out what its data and method attributes are? cheers, Chris

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