May 2002 - Zope - Zope lists

M. Renfro's sitemap -error
by Marie ROBICHON 06 May '02

06 May '02

Hi, has anyone tried out Mike Renfro' s howto on 'Next generation sitemap' using pythin scripts and ZPT? I get an error when I try to test the menu_list script: Error Type: ValueError Error Value: list.index(x): x not in list on line 18: top_parent_index=folder_list.index(parent_folders[-1]) Since I am a real newbie to Python it may be something obvious here, any clues anyone? TIA Marie Robichon Web Task Force European Synchrotron Radiation Facility BP 220 38043 Grenoble Cedex France http://www.esrf.fr Tel: (33) 04 76 88 21 86 Fax: (33) 04 76 88 24 27

2 1

decaring a list in python
by Ed Colmar 06 May '02

06 May '02

Hey everyone. I've got an easy one here, but it's got me somewhat confused... I declare in my product: self.skins_loaded = ['default', 'minimal'] when I use it in a <dtml-in> I get "strings are not allowed". Ok, fine, so I go to my edit form, which is marshalling "skins_loaded:lines" and I put them on two lines.... Then it works as it should... How can I get this to happen from the start? I must be missing something really obvious. thanks for any clues! -e- -- Green Graphics ::: Print and Web Design ::: 510.923.0000

2 2

manage_changeProperties bug ?
by Julián Muñoz 06 May '02

06 May '02

container.manage_changeProperties(sdfsd='fasdfsd') Always returns None, even if the "sdfsd" property is not defined. The Zope Book says: "If no REQUEST is passed, the method returns None on success". (So I undestand that on failure another value should be returned...) With Zope 2.4.1, on Linux. I don't see any reference to this bug in the CHANGES.txt of Zope 2.4.4... -- __o _ \<_ (_)/(_) Saludos de Julián EA4ACL -.- Foro Wireless Madrid http://opennetworks.rg3.net

2 1

RE: [Zope] Either I'm an Idiot or dtml-in is broken and/or poorly
by Raj NS 06 May '02

06 May '02

Try same DTML codes on DTML Method ( Not DTML Document) ________________________________________________________________________ For live cricket scores download Yahoo! Score Tracker at: http://in.sports.yahoo.com/cricket/tracker.html

1 0

Inheritance (?) problem
by Luca Manini 06 May '02

06 May '02

Hi, I have a pure-python (no Zope classes around) 'form' class like this: class form: def __init__(self, id): self.id = id def actionTarget(self, REQUEST={}): "Main entry point." return 'foo' >From this class I derive a subclass class zopeForm (SimpleItem.SimpleItem, form): def actionTarget(self, REQUEST={}): "Main entry point." # ... other thing done here... form.actionTarget (self, REQUEST) The zopeForm class is part of a product so I have instances of zopeForm (say 'zf') in a folder (say 'foo'). Now I would like to visit the URL ...../foo/zf/actionTarget but I get the following error: Error Type: TypeError Error Value: unbound method must be called with class instance 1st argument but 'self' in the call to form.actionTarget should be a zopeForm instance! If I change zopeForm.actionTarget to: def actionTarget(self, REQUEST={}): "Main entry point. Passing http REQUEST" raise self I get Error Type: TypeError Error Value: exceptions must be strings, classes, or instances and if I change it to: def actionTarget(self, REQUEST={}): "Main entry point. Passing http REQUEST" raise str(self) I get Error Type: Error Value: None It seems I'm missing something.... Any hint? TIA, Luca

2 4

Zope/Apache and Microsoft Active Directory
by pieterb＠gewis.nl 06 May '02

06 May '02

Hello, Did anybody ever get Zope and/or Apache to authenticate against a Micrsoft Active Directory? I tried using LDAPUserfolder on Zope 2.5.1/Python 2.1.3 but I'm getting all sorts of errors, e.g. Logging: ldapuser not found (getUser) User-info: (###Error###: ldap.OPERATIONS_ERROR, {'desc': 'Operations error', 'info': '000020D6: SvcErr: DSID-03100690, problem 5012 (DIR_ERROR), data 0\n'}) Did anybody else have more luck, or any idea where to start debugging? Pieter

3 4

Annoying ambiguous name
by Peter Bengtsson 05 May '02

05 May '02

I define a method like this: ListIssues = PageTemplateFile('zpt/ListIssues', globals(), __name__='ListIssues') Then I want to make a shortcut to that method like this: listissues = ListIssues But then I get that annoying message:: 2002-05-04T16:04:13 PROBLEM(100) Init Ambiguous name for method of Products.IssueTrackerProduct.IssueTracker.IssueTracker: "ListIssues" != "listissues" How do I get this right?? I also tried (outside the class): IssueTracker.__dict__['listissues'] = IssueTracker.ListIssues but still the same old error. Anybody knows how to solve this? Peter

2 2

Bizarre changes in the meaning of "self" (mixed DTML/python scripts)
by Erik M Norvelle 05 May '02

05 May '02

Greetings: I am developing a calendar product, which allows for the addition of event objects to the main calendar object. The problem I am having is that after I use DTML scripts to perform calls to python code, the meaning of the "self" variable in the python code undergoes a strange change. I'll do my best to describe the problem below (Note that all goes well until step 5, where things get weird) 1) For instance, assume I have added (via ZMI) an instance of my ZCalendar product (call it MyCalendar). ZCalendar is coded as a Python package. 2) The default method (index_html) provides a listing of all the currently registered events, as well as provides a button to add a new event. 3) That button calls a DTML method (called add_event) on the MyCalendar instance. add_event.dtml has a form whose action is to collect information about the new event, and then (when the Submit button is clicked) call a method called "addEvent" on the MyCalendar object. 4) addEvent takes the information collected by the add_event DTML Method, and creates a new ZCalEvent object, and inserts it into a Folder called 'Events'. No surprises there, and everything works just fine until then. 5) Once addEvent is finished adding the new event, it performs the command "return self.index_html(REQUEST)". The idea here is that I want the user taken back to the main Calendar view after adding an event. I do *NOT* want them taken to any part of the management interface. 6) By the time we get here, the URL has become "http://localhost:8080/MyCalendar/addEvent", and thus Zope interprets "self" as referring to the method instance of "addEvent". Zope still manages (via acquisition) to find the index_html method, but the resulting call is something like "MyCalendar.addEvent.index_html(REQUEST)", rather than "MyCalendar.index_html(REQUEST)" 7) Needless to say, entities which are visible to MyCalendar are not visible to addEvent, and so when Zope gets to index_html, it reports an AttributeError. There are a variety of refrences I make in index_html which only make sense when it is being called on MyCalendar, and not when it is being called on the addEvent method instance. The way I eventually got around this is to change addEvent to perform a redirect instead of a return: "REQUEST.REPONSE.redirect(REQUEST['URL1'] + '/index_html')". This works, but is an egregious hack, since it depends upon the (potentially unpredictable) value of REQUEST['URL1'], which might or might not be correct in all instances. How can I do things the "correct" way, and make sure that in the context of MyCalendar.addEvent, "self" refers to "MyCalendar" and not its "addEvent" method (as is normal in all OOP languages I have ever met so far). Attached is a copy of the code I have so far (with the ugly hack included). If anyone can take a look and tell me how to avoid this situation, I would appreciate it greatly! Direct replies to me at norvelle(a)ag.arizona.edu would be most welcome, since this is such a high-traffic list. TKA, Erik Norvelle Support Systems Analyst, Sr. The University of Arizona

1 0

Transactions and rollback
by Dennis Allison 05 May '02

05 May '02

I am building a Zope site where a manager enrolls users. A manager completes a form that gathers information about the user. When submitted, the action routine does two things -- .. updates a MySQL database with the user information .. updates acl_users locally to manage the login The MySQL is of a vintage that supports transactions so (per the Zope book) that update will go as a transaction and will either succeed or fail. Likewise, the acl_user update is a transaction and will either succeed or fail. My code needs to keep everything in sync and treat everything as a single transaction, committing only when both the MySQL and the ZOODB updates succeed, otherwise backing out. The problem is figuring out how to do this. Is there a general mechanism? If there isn't, then another approach is to do the acl_user update first since it can be undone (assuming I can get a handle on the transaction), then the MySQL transaction. If the latter fails, I can back out of the acl_user transaction by undoing it. I am using Z SQL methods for the MySQL side of things--they provide a nice wrapper. A few things are unclear from the docs. What exception gets raised by a Z SQL method if it does not commit? On the acl_users side, the updates are managed through External Methods as noted in the code. Currently they just make calls on UserFolder per the in-line documentation. This can fail. For example, what exception is raised when an attempt is made to add a name already in use. (Are these documented somewhere?) I presume that an exception in the External Method will get exported out to an enclosing <dtml-try> block so it can be captured and delt with in the web portion of the system. If I need to back off a committed transaction in the ZOODB, how is that done programatically. Presumably I can do the equivalent of the undo management screen progrmatically, but to do do, I need the handle of the transaction I want/need to undo. I don't see how to get it. Thanks for help.

2 1

timeout, thread, and external connections
by Warnes, Gregory R 05 May '02

05 May '02

Hi, I'm writing a tool similar to MatlabDA for the open-source stat package 'R'. Since R isn't thread safe and is very stateful, I've written code to start up, communicate with, and close independent R processes. This is all working properly. Now, I want to the connection to the external process to 'timeout' after a period of inactivity, so I won't end up with an slowly increasing number of R processes hanging around not doing anything. I have code to 'pickle' the session information and terminate the external R process and to start up a new process and 'unpickle' the state. This will let me 'restore' the connection when a new request comes in. What I don't have is code to implement the timeout feature. Is there as 'standard' method for doing this within Zope? My initial thought is to create a new thread when the connection object is created. Its sole purpose will be to sleep for the timeout length, check whether the connection object has been access during the sleep interval. If it has, then it will reset reset the counter and go back to sleep. If there has not been any access, it will lock the connection object, call the pickle routine, close the connection, and terminate itself. Has anyone else implemented something like this? Are there any 'gotchas' or problems threading under zope. Are there other, better, strategies? For instance, is there a 'callback after interval' function exposed by zope to remove the need for the new thread? Thanks, Greg LEGAL NOTICE Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access to this E-mail by anyone else is unauthorized. If you are not an addressee, any disclosure or copying of the contents of this E-mail or any action taken (or not taken) in reliance on it is unauthorized and may be unlawful. If you are not an addressee, please inform the sender immediately.

2 1