November 2000 - Zope-Dev

Adding properties in __init__
by Chris Withers 07 Nov '00

07 Nov '00

Hi, I have a product class that subclasses SimpleItem and PropertyManager. If I try and add a property in __init__ as so: self.manage_addProperty('AProperty','1\n2\n3','lines') I get the following wonderful error: Error Type: AttributeError Error Value: aq_base I'm guessing that this is because self isn't an acquisition wrapper in __init__ (even though SimpleItem is Acquisition.Implicit) but what am I supposed to do to add a property in __init__? cheers, Chris

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Bad General Try and Except
by Chris Withers 07 Nov '00

07 Nov '00

Hi Again, Management.py (around line 148) contains one of those nasty general try: except: clauses which mask real problems Anyone know why it's there? With some additions, I found out it was masking an 'index out of range' error in the product I'm developing. I wonder why this was presented as an unauthorized error? confusedly, Chris

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timezone for IST
by Philip S Tellis 07 Nov '00

07 Nov '00

I've edited DateTime.py and added a timezone for IST: Line 166: (_zlst) was: 'Iran','Israel','Jamaica','Japan','Mexico/BajaNorte', now: 'Iran','Israel','IST','Jamaica','Japan','Mexico/BajaNorte', Line 223: (_zmap) was: inserted new line now: 'ist':'IST', My apps seem to be working, but I am only testing with IST. Will this break anything else? If not, can it be added to the next release? Thanks, Philip -- Often statistics are used as a drunken man uses lampposts -- for support rather than illumination. Visit my webpage at http://www.ncst.ernet.in/~philip/ Read my writings at http://www.ncst.ernet.in/~philip/writings/

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RE: [Zope-dev] It's been a while
by Roch'e Compaan 07 Nov '00

07 Nov '00

> DataSkins are for PD and UI classes. It's usually simplest to combine PD > and UI, and as long as you ensure that UI methods call PD methods, not the > other way around, then it works fine. Thanks Philip, simple divide with great effect on my understanding and thanks Steve for the links. My Roadmap then: 1.For my Problem Domain objects, I create ZClasses (with Dataskin as base class) with normal/dataskin? propertysheets 2.Then I delegate data management for my ZClasses to specialists: - Create specialists for my Dataskins - Select the ZClass under storage tab of relevant rack - Add Skinscript methods which store and retrieve properties in RDBMS, delete & insert objects into RDBMS. Is this right?

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RE: [Zope-dev] calling dtml method with same name up the hierarchy.
by Casey Duncan 06 Nov '00

06 Nov '00

The following should work in your nested standard_html_footer to call the higher level one without infinite recursion: <dtml-with "PARENTS[1]"> <dtml-var standard_html_footer> </dtml-with> hth, Casey D.

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ZClasses not copyable - why?
by Philipp Auersperg 06 Nov '00

06 Nov '00

It is not posible to copy ZClasses, when I try to copy a ZClass in the Management Interface I get the error: 'The Item 'blorf' does not support that operation' I digged into that and found that in the ZClass.py there exists a method def cb_isCopyable: pass I was so crude to replace the pass with a 'return 1', restarted Zope and could now copy ZClasses as I wanted it. ----------------------------- My first question now: 0. Why are ZClasses not copyable? 1. Do I shoot into my foot with my hack or is that OK? ----------------------------- And now my second question I am working on a ZClass-intensive project and sometimes I want to add/remove base classes of a ZClass without redefining the whole class manually. in ZClass I have found a nice-sounding method _setBasesHoldOnToYourButts() <grin>, and the source is commented with '#Eeeek', hmmmm What are the risks for a good shot into my foot using this function? thanks phil

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RFC: Fishbowl proposal, CorbaClientIntegration
by Tres Seaver 06 Nov '00

06 Nov '00

At the request of a Zopista who found my earlier work toward Zope-CORBA integration, I have created a fishbowl proposal at: http://dev.zope.org/Wikis/DevSite/Proposals/CorbaClientIntegration Tres.

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It's been a while
by Roch'e Compaan 06 Nov '00

06 Nov '00

It's been a while since i've had time to explore ZPatterns - and now the time has come that I am considering to base development for a new project on ZPatterns. I think I'm better prepared now - I read Coad's Object Models, and implemented a data management layer in Delphi. The project envolves Customer Relationship Management - like openticket, but I don't like openticket's tight coupling with the SQL databases. First stupid question: Are ZClasses based on Dataskins PD (Problem Domain) objects or DM (Data Management) objects? Can somebody possible categorize the main classes in ZPatterns according to Problem Domain, User Interface, Data Management? Would it be safe to base development on ZPatterns if I want to use an SQL RDBMS as storage and ZPatterns as DataManagement layer ie. is ZPatterns stable engough? Roché

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Debugging ConflictErrors
by John Eikenberry 06 Nov '00

06 Nov '00

Hey all, Using ZPatterns, I have a set of specialists/racks/dataskins that have a dependency relation. So I've used triggers to chain deletes in an appropriate way. I won't go into a lot of detail here as there is quite a bit of code, and I figure I'm the best suited to debug it. My problem is I can't get a hold on where the problem is... all the triggers and appropriate manage_delete's are getting called. I've checked to make sure I'm not modifying something already marked for deletion. I don't manually commit at any point and there are no other threads getting run. Are there any good heuristics I can use to figure out what the problem is? I'm sure others have run into ConflictErrors before, how have you debugged them? Thanks in advance for any tips... -- John Eikenberry [jae(a)zhar.net - http://zhar.net] ______________________________________________________________ "A society that will trade a little liberty for a little order will deserve neither and lose both." --B. Franklin

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Store values thread-wide ?
by Martin Grönemeyer 06 Nov '00

06 Nov '00

Hello everyone, I'm playing around with Zope-Objects and find out, that the SecurityManager holds it's informations only for one request. If the Zope-Publishing starts, an existing SecurityManager gets destroyed via __bobo_before__ (am i right ?). In the next step, a SecurityManager-Object is instanciated by the validated_hook in the traverse-method of the BaseRequest. In my own methods i can now get the security-manager and set own properties in this object. I know, this is dirty and i won't use it in real life, but has anyone an other idea how to store informations thread-wide ? Hope you won't kill me. Martin i.A. Martin Grönemeyer Technik || | || c o m.u n i t G m b H ||| | | || | | | | | | | | http://www.comunit.de/ <mailto:martin@comunit.de> Eiffestr. 598 20537 Hamburg | Germany Fon +49 +40 | 21 11 05 25 Fax +49 +40 | 21 11 05 26

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