January 2001 - Zope-Dev

SkinScript enhancement
by Steve Alexander 14 Jan '01

14 Jan '01

While debugging some dependencies in some of my SkinScript, I had an idea. SkinScript could be extended so that COMPUTE statements can have a RECOMPUTE FOR clause. This clause would tell a dataskin to invalidate its cache for the attributes in the COMPUTE statement if any of the attributes in the RECOMPUTE FOR clause changed. So, WITH QUERY some_method(primary_key=ms_vars_id) COMPUTE foo,bar,baz OTHERWISE LET foo='no foo', bar='no bar', baz='no baz' RECOMPUTE FOR ms_vars_id This is equivalent to the above statement, without the RECOMPUTE FOR clause, followed by a trigger: WHEN OBJECT ADDED, CHANGED CALL HAS_CHANGED('ms_vars_id') and self._uncache_attrs(['foo', 'bar', 'baz']) This assumes a method of DataSkins.DataSkin _uncache_attrs: def _uncache_attrs(self, names): v=self._v_attrCache for name in names: del v[name] I haven't tested any of this yet. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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Tip: Skinscript Debugging
by Steve Alexander 14 Jan '01

14 Jan '01

When debugging skinscript, especially tricky dependencies between what gets computed when during state changes, do the following: 1: Run zope in debug mode (-D) 2: Put an external method called print_ in the root of your ZODB, with the code: def print_(s): print s 3: In your SkinScript, if you want to know when a trigger is called, or when a set of attributes get computed, use this kind of thing: WITH QUERY foo(id=some_id) COMPUTE thing=RESULT, bar=baz, _printout_foo=self.print_('query foo called, id=%s' % some_id) OTHERWISE LET thing=_.None, bar='no bar', _printout_foo=self.print_('query foo called, otherwise clause') WHEN OBJECT CHANGED CALL print_('CHANGED start'), Catalog .uncatalog_object(_.string.join(self.getPhysicalPath(),'/')), print_('CHANGED middle'), Catalog .catalog_object(self, _.string.join(self.getPhysicalPath(),'/')), print_('CHANGED end') 4: Read the debug printout, and work out that you're computing attributes for cataloging before changing the attributes they depend on. 5: Amend code and skinscript, test, document code, sleep. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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(no subject)
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14 Jan '01

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ZPatterns implementation question: images attributes?
by Zope mailing lists 14 Jan '01

14 Jan '01

I have a specialist (actually, EMarket has a specialist <grin>) that manages objects that from a design point of view I think should have a couple of Images as attributes (thumbnail and fullsized images of the product). The question is, how do I implement this using ZPatterns? Currently all of the other object data is pulled from an SQL database. I don't mind storing the Images in the ZODB, but I'm having a hard time finguring out how I would implement that. Pointers or alternate design suggestions welcome. --RDM

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Re: [Zope-dev] How do I create a folder with subfolders, docs etc?
by Robert Prosenc 13 Jan '01

13 Jan '01

try this: <dtml-call expr="manage_addFolder('mainfolder')"> <dtml-call expr="PARENTS[0]['mainfolder'].manage_addFolder('subfolder')"> it works with zope 2.2.4 regards rob. ------------------------------------------------------------ Robert Prosenc web: http://www.matrixware.at/ mail: r.prosenc(a)matrixware.at Matrixware phone: +43( 1) 713 43 06 - 2 postal: Geusaugasse 39 (Ecke Kundmanngasse) A-1030 Vienna, AUSTRIA ------------------------------------------------------------ while !asleep() sheep++ ------------------------------------------------------------

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Java/Python
by Stefane Fermigier 13 Jan '01

13 Jan '01

On Fri, Jan 12, 2001 at 12:00:08PM -0800, zope-dev-admin(a)zope.org wrote: > From: "Dario Lopez-Kästen" <dario(a)ita.chalmers.se> > Subject: [Zope-dev] Using Java (or JDBC) with Zope/Python > Date: Fri, 12 Jan 2001 15:09:39 +0100 > Organization: CITES > charset="iso-8859-1" > > Hello! > > I am exploring the possibilities of using JDBC with Zope, as well as > investigating whether JavaBeans could be used from Zope/Python. > > It seems that most Python/Java stuff use the JPython/Jython approach and, > IIRC, Zope and Jython/JPython don't mix very well/at all. > > Any pointers, references, comments, etc accepted. One project that I know of: http://www.arakne.com/jpe.htm the home of Java-Python Extension (JPE), a Python extension module and a Java package ensuring seamless interoperability between Java and Python. Alpha source code available on http://sourceforge.net/projects/jpe S. -- Stéfane Fermigier, Tel: 06 63 04 12 77 (mobile). "Amazon: we patent the dot in .com"

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How to call 'inheritedAttribute' in ZClass dtml method
by Dirksen 13 Jan '01

13 Jan '01

'testb' subclasses 'testa', and wants to call 'testa.do()' in one of its dtml method. I found in zope's source codes that zope tackles this with "testb.inheritedAttribute('do')()". Yet this doesn't work in zclass dtml method. The system complains not knowing 'testb'. How to refer to its zclass name? Any other ways for a zclass to call its base class's method? Please help! Dirksen __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/

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updated main.dtml for PlugIns product for Zope 2.3
by Steve Alexander 13 Jan '01

13 Jan '01

I've put up a new main.dtml file for the PlugIns product (related to ZPatterns), for use with Zope 2.3. This replaces the previous file posted at the same URL. http://www.cat-box.net/steve/main.dtml The change makes the odd-even table row styles work consistently even when there are plug-ins in the plug-in container. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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Debugging Zope with Komodo
by Andy McKay 13 Jan '01

13 Jan '01

Aaron has just helped me get Komodo debugging working for Zope. Both Neil and I think this is absolutely fantastic, for the first time we can see the interaction of Zope internals as they happen (its no longer a black box anymore). This shed so much light on Zope, I think its great and so will any Zope developer. Many thanks to all involved in Komodo for making this happen. -- Andy McKay.

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RE: [Zope-dev] New UI for 2.3
by Dieter Maurer 12 Jan '01

12 Jan '01

Brian Lloyd writes: > ... > But is it really so bad > to > make a 32 pixel-high concession to a small pittance of > branding? I can spare 32 pixels in height, but the current 32 pixels are worthless for me as I cannot read what is there. I do not know at what design schools one learns that black letters on dark blue background is a good thing. It seems to be quite widespread, as I see this quite often. Please keep in mind that colors do not look equal everywhere. My colors are usually dimmed as my eyes start burning when I have to look into bright light for a longer time (Zope's management screens are very difficult for me as they use bright white as background. I already looked whether I could change it, but unfortunately, the color is coded individually in each file. What about using a central style sheet instead?). Therefore, what might look good at your screen, is unrecognizable on mine (and probably others). Furthermore, you lost brand by placing the blue Zope button onto the blue stripe. You can now only guess, what is should be. While contrast is very high at most places in the new design, it is far too low in this place. Dieter

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