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Python 2.3.2 and dir
by Alan Milligan 15 Dec '03

15 Dec '03

Hi, I'm trying to upgrade my Zpydoc product to Python 2.3.2 from 2.1.3 and have come across a confusing situation in regard to the inspect.getmembers function. This function uses the builtin dir() function to get a list of an objects attributes. For Zope products, I am getting a situation where returned attributes are not found in the object - explicitly __call__, __delattr__, etc etc. I suspect this has something to do with python 2.2 class changes, and issues with ExtensionClass not behaving like a first class Python object. If someone can give me a complete explaination, I can decide upon appropriate behaviour.. In addition, there's a caveat upon the dir() function: Note: Because dir() is supplied primarily as a convenience for use at an interactive prompt, it tries to supply an interesting set of names more than it tries to supply a rigorously or consistently defined set of names, and its detailed behavior may change across releases. While this is fine for dir(), surely we do expect consistency across releases for inspect.getmembers....

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On with the show....
by Sidnei da Silva 15 Dec '03

15 Dec '03

So, it seems Chris McDonough figured out what we couldn't *wink*. Now, it seems like Zope HEAD boots fine with an old Data.fs, and I could even get a Plone 1.0 site migrated to Plone 2.0 and CMF 1.4 (a small problem on DCWorkflow, but I checked in a fix). Soo... now, i'm getting some errors out of CMF which seem pretty obvious, and I wonder how they worked before. Example: * <FSPageTemplate at /blog/folder_listing used for /blog/Members/sidnei> TypeError: unbound method pt_getContext() must be called with ZopePageTemplate instance as first argument (got nothing instead) (Also, an error occurred while attempting to render the standard error message.) If you look at FSPageTemplate, its obvious that it doesn't subclass ZopePageTemplate, but the solution is not so obvious. Using: pt_getContext = ZopePageTemplate.pt_getContext.im_func Seemed to work, though I'm almost sure that is not the Right Thing (tm). A similar error also happened with FSImage.__str__ (which is assigned Image.__str__, but FSImage just subclasses FSObject). Any thought on those? Then a completely different error happened, when looking at a item with comments: * Module Products.PageTemplates.ZRPythonExpr, line 48, in __call__ __traceback_info__: container.sort_modified_ascending( here.portal_discussion.getDiscussionFor(here).getReplies()) * Module Python expression "container.sort_modified_ascending( here.portal_discussion.getDiscussionFor(here).getReplies())", line 1, in <expression> * Module Products.VerboseSecurity.VerboseSecurityPolicy, line 157, in validate Unauthorized: The container has no security assertions. Access to 'getReplies' of (Products.CMFDefault.DiscussionItem.DiscussionItemContainer object at 0x419681ac) denied. AFAICT, there's nothing wrong with DiscussionItemContainer. It has been InitializeClass()'ed and has a docstring. Setting __allow_access_to_unprotected_subobjects__ = 1 works, but that is obviously wrong. Ideas? -- Sidnei da Silva <sidnei(a)awkly.org> http://awkly.org - dreamcatching :: making your dreams come true http://plone.org/about/team#dreamcatcher This system will self-destruct in five minutes.

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Zope Head (2.8) breaks "refresh"
by Dieter Maurer 15 Dec '03

15 Dec '03

Playing with Zope Head (as of 2003-12-04) revealed problems with refresh. I see varying behaviour refreshing "CMFCore": * Refresh is not effective (objects continue the have the old behavior) * After a while, "commit" reports an exception "ValueError: Cache values may only be in one cache." http://localhost:10080/Portal/portal_types/Document/manage_editProperties Traceback (innermost last): Module ZPublisher.Publish, line 104, in publish Module Zope.App.startup, line 223, in commit Module ZODB.Transaction, line 254, in commit Module ZODB.Transaction, line 233, in commit Module ZODB.Transaction, line 352, in _commit_objects Module ZODB.Connection, line 286, in commit ValueError: Cache values may only be in one cache. The following transscript shows strange reproducible behaviour which is almost surely related to the above: linux: bin/zopectl debug Starting debugger (the name "app" is bound to the top-level Zope object) >>> pt=getattr(app,'standard_template.pt') >>> pr=app.unrestrictedTraverse('Control_Panel/Products/PageTemplates/manage_performRefresh') >>> pt.getId() 'standard_template.pt' >>> pr() ## refresh >>> pt.getId() ## apparently not deactivated 'standard_template.pt' >>> pt._p_deactivate() >>> pt.getId() ## obviously a wrong result 'Zope' >>> pt.aq_base.getId() ## may be explainable as "pt" is not refetched Traceback (most recent call last): File "<stdin>", line 1, in ? File "/home/dieter/ZH/ZopeHead/lib/python/ZODB/Connection.py", line 424, in setstate self._reader.setGhostState(obj, p) File "/home/dieter/ZH/ZopeHead/lib/python/ZODB/serialize.py", line 203, in setGhostState obj.__setstate__(state) File "/home/dieter/ZH/ZopeHead/lib/python/Products/PageTemplates/ZopePageTemplate.py", line 301, in __setstate__ ZopePageTemplate.inheritedAttribute('__setstate__')(self, state) AttributeError: 'NoneType' object has no attribute 'inheritedAttribute' >>> pt=getattr(app,'standard_template.pt') ## refetch >>> pt.getId() ## still wrong 'Zope' Looks as if "refresh" did not flush the ZODB cache, which still delivers objects referencing the old classes. I now know why the above code does not work as I expected: The new refresh no longer uses "minimize" to flush the ZODB caches but updates the "code_timestamp". This causes the cache to be replaced by a new one when the connection is opened for the next time. ATT: replacing the cache without clearing it can lead to huge memory leaks (everything in the old cache is leaked!). I can not yet explain the original observations... -- Dieter

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RE: [Zope-dev] problem with TAL statements across multiple lines in zope 2.7b3
by Gerry Kirk 15 Dec '03

15 Dec '03

These are lines that did not produce an error with zope 2.6.2. They aren't even my code - I've run into errors in two different products - Plone and PloneCalendar. For testing, I merged the line together, then pressed Enter and used spaces to move the code across multiple lines. Gerry Kirk Project Manager www.faithonline.com www.dioceseonline.com > -----Original Message----- > From: Stuart Bishop [mailto:stuart.b@commonground.com.au] > Sent: December 12, 2003 11:55 PM > To: Gerry Kirk > Cc: zope-dev(a)zope.org > Subject: Re: [Zope-dev] problem with TAL statements across > multiple lines in zope 2.7b3 > > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > On 13/12/2003, at 3:34 AM, Gerry Kirk wrote: > > > i didn't have this problem with zope 2.6.2. I have a TAL > statement as > > follows: > > > > tal:define = "url python:test(item_typeinfo.getId() in > > use_folder_contents, item.absolute_url()+'/folder_contents', > > item.absolute_url()+'/'+action);" > > > > this statement works if it is all on one line, but i get a syntax > > error if it is spread across multiple lines. is this a bug, or a > > change in TAL design? > > Works for me. You aren't accidently splitting inside of a string are > you? > > - -- > Stuart Bishop <stuart(a)stuartbishop.net> > http://www.stuartbishop.net/ -----BEGIN PGP > SIGNATURE----- > > Version: GnuPG v1.2.3 (Darwin) > > iD8DBQE/2puKAfqZj7rGN0oRAs9IAJ0SudIu20xmevZrSIHTPu2Aug9cDwCgiRFw > 7x6vS4ticldQQ6H+Q4dL8xU= > =hBXD > -----END PGP SIGNATURE----- >

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Using the error log
by Joachim Werner 14 Dec '03

14 Dec '03

Hi! I'd like to use the Site Error Log facility to log errors from my application. What I want to do is catch all errors that occur when a page is rendered and log them to the site error log. The pages rendered consist of many modules that can trigger their own errors. On screen there should be a short error message at the place the error occurred and a link to the full log entry in the error log. So what I'd need to know is: a) How can I write errors to the log from an excep: block in Python? b) How can I get back the log ID for that specific error log entry to use it in my application? Is there any written documentation on how to hook up the error log? Cheers Joachim -- iuveno AG Joachim Werner Wittelsbacherstr. 23b 90475 Nürnberg Tel.: +49 (0) 911 9883 984 E-Mail: joachim.werner(a)iuveno.de WWW: http://www.iuveno.de

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problem with TAL statements across multiple lines in zope 2.7b3
by Gerry Kirk 13 Dec '03

13 Dec '03

i didn't have this problem with zope 2.6.2. I have a TAL statement as follows: tal:define = "url python:test(item_typeinfo.getId() in use_folder_contents, item.absolute_url()+'/folder_contents', item.absolute_url()+'/'+action);" this statement works if it is all on one line, but i get a syntax error if it is spread across multiple lines. is this a bug, or a change in TAL design? - Gerry

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Environment for Python Development
by Asad Habib 12 Dec '03

12 Dec '03

Hello. Do any of you know of an IDE(preferably open source) that I can use to develop/debug/test python code in? Thanks. - Asad

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Creating a Zope Product
by Asad Habib 12 Dec '03

12 Dec '03

Does anyone know how to create a Zope Product? One example would be the Local File System Object that I am using. If you could point me to some resources that would be great. Thanks. - Asad

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Changing the Appearance of the Contents of a Local File System Object
by Asad Habib 12 Dec '03

12 Dec '03

Hello. I have a folder that I have created at the root level and inside this folder I have placed one Local File System object. The Local File System object contains two File objects. When I view the Local File System object by clicking on the 'View' option provided by the management interface, I can see that it contains two File objects. What I would like to do is to change the way that these File objects are displayed. Specifically, I would like to show only certain attributes that these File objects have and hide others. Right now, the following attributes are shown: type, icon, size, and last modified time(mtime). I would like to hide the size and last modified time(mtime) attributes. I want these attributes to be set but I do not want their values to show. FYI, I am using the Local File System Product. Any help would be greatly appreciated. Thanks. - Asad

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Post-mortem [Was: Zope 2.7.0 b3 regressions]
by Stefan H. Holek 12 Dec '03

12 Dec '03

After causing all this noise, let me summarize what I now understand is the intended behavior of Zope's URL methods. Given an object is accessed by /VirtualHostBase/http/example.com:80/VirtualHostRoot/_vh_foo/folder/doc 1) doc.absolute_url() Returns the full URL of doc including protocol and host. e.g. http://example.com/foo/folder/doc 2) doc.absolute_url(relative=1) Returns the path of doc, relative to the virtual root. e.g. folder/doc 3) REQUEST.BASEPATH1 + '/' + doc.absolute_url(1) Results in the absolute path of doc, starting at the server root. e.g. /foo/folder/doc Comments: ad 2) This may or may not be RFC-2396 compliant, I must admit I fail to parse the RFC here. It certainly appears necessary for b/w compatibility at least. ad 3) It may still be a good idea to add an API method for this (e.g. 'absolute_path') like I proposed in February (#809). If only to increase the visibility of this requirement. I understand that it may be too late for 2.7. Whoever is going to unroll the fix, please also adapt the tests in Products/SiteAccess/tests. Finally, please accept my apologies for the tone of some replies; I do certainly need a vacation. Stefan -- The time has come to start talking about whether the emperor is as well dressed as we are supposed to think he is. /Pete McBreen/

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