December 2003 - Zope-Dev

relations in objects
by Jason Corbett 28 Dec '03

28 Dec '03

Hello Zope developers, I'm a newbie (sorry most people have this curse at one point or another). I have read the zope book (or at least most of it), and the zope developer manual. I can't quite figure out how to have relationships between instances of classes in the database. Let me first ask if I'm using zope for the correct thing. I see that a lot of zope products deal with content management, while mine doesn't really. Basically I want to do what I would normally do with mysql and php, but use zope instead. So I need a way to reference in some intelligent way between objects in zope, and I need a way to query for a list of them. I read about ZCatalogs, etc and how you can use that for querying and indexing. That isn't my first priority, so I'll worry about that a little later. Basically I have an instance of a class 'A'. As part of it I need to reference either a single or in some cases multiple instances of class 'B'. Basically I'll have a mix of one-to-one relations and one-to-many. When I'm coding my python class (I'm going to do a product if you can't tell), how would I get a list of the 'B' instances that relate to this object, and how would I store that? The zope developer manual was pretty good for writing classes, and making views on it, but I need to be able to call methods on those instances and return lists of them. Sorry for the long email, I just don't want to leave details out. If you think I'm barking up the wrong tree, and shouldn't be using zope for this, don't be afraid to let me know. Although I will be pretty disappointed, I think zope is exactly what I've been looking for, I can't find anything like it in any other language. Jason Corbett __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com

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Zope 3 Newsletter 11
by Gary Poster 23 Dec '03

23 Dec '03

WELCOME TO THE ZOPE 3 NEWSLETTER: ISSUE 11 (23 DECEMBER 2003) Welcome to the eleventh Zope 3 newsletter. Information about Zope 3 and newsletter contributions and suggestions can be found at the bottom of this newsletter. GLOSSARY FOR THE UNINITIATED Encounter a term in this newsletter you don't know? Try this glossary: http://dev.zope.org/Zope3/NewsletterGlossary NEWS SNIPPETS: - Stephan Richter has been doing some important work on documentation, preparing for his SAMS Zope 3 book. See the content so far at http://dev.zope.org/Zope3/DevelCookbook - Zope2 developers: Philipp von Weitershausen prepared slides for the Zope3 Rheinland sprint that discussed Zope3 from a Zope2 developer's perspective. See http://philikon.de/files/zope3-for-zope2-developers.sxi for an OpenOffice.org-format download - Jake (a.k.a. BZ) announces a new Zope site, http://www.zopezone.com/, including a Zope3-specific forum. JIM FULTON: A status update from the Zope Pope Geddon report - Parentgeddon was completed. Context wrappers are no longer used to track object locations. Objects now keep references to their parents using __parent__ attributes. See: http://dev.zope.org/Zope3/ParentGeddon - While working on parentgeddon, I changed the way object-lifecycle events are handled. See: http://dev.zope.org/Zope3/SimplifyObjectLifecycleAndLocationEvents and http://dev.zope.org/Zope3/LocationRelatedEvents - The container API was simplified a bit: http://dev.zope.org/Zope3/ReplaceSetObjectWithSetitem - Adaptergeddon was completed. This is part of a larger project: http://dev.zope.org/Zope3/ComponentArchitectureSimplification Adaptergeddon included: o Support for multi-adapters. Multi-adapters are adapters that adapt multiple objects at the same time. o Replacement of the View, Resource and Skin services with a single presentation service. This included recasting views as multi-adapters for objects and requests and recasting resources as request adapters. An important consequence of this change is that it is now possible to provide views that provide specific interfaces. This will allow a number of presentation frameworks (e.g. traversal and widgets) to be cleaned up a lot. o A major refactoring of the way interface relationships are managed. - Implementing containers has been simplified quite a bit. See http://dev.zope.org/Zope3/SimplifyImplementingContainers and http://dev.zope.org/Zope3/ContainmentConstraints There is a new section in the programmers tutorial: http://dev.zope.org/Zope3/Zope3PythonProgrammerTutorialChapter1 That documents how to create containers. - We are eliminating many services as part of http://dev.zope.org/Zope3/ComponentArchitectureSimplification The sql connection service has been eliminated. We are working on removing the caching, interface and factory services. Site-management views will provide user-friendly interfaces for browsing and managing database connections, caches, interfaces and factories. Sprint Report Bangalore sprint There was a very successful sprint in Bangalore, India December 4-19. See: http://dev.zope.org/Zope3/BangaloreSprint JAN SMITH: Melbourne Summer Sprint! [we received two sprint messages from Jan. The first has the basics, and the second has an exciting update.] Sprint announcement We are going to have a Melbourne Summer Sprint 4th - 9th February. Paying for Jim's air fare has been an Oz Zope community effort with contributions coming from zope businesses and some individuals. Wednesday 4th Feb - Friday 6th Feb - Zope 3 Tutorial workshop: For first time sprinters, attendance at the tutorials is a prerequisite. The tutorial will consist of three days of lecture and hands on sessions run by Jim Fulton. Python experience is required. All welcome to attend the tutorial Saturday 7th February - Monday 9th February Sprint days: Developers who have participated in a sprint do not have to attend the tutorial sessions. Venue:: Trinity College, Melbourne University, Victoria, Australia http://www.trinity.unimelb.edu.au/map/trinity_vista.shtml Melbourne University is 1 kilometre from city centre Facilities: a state-of-the-art Multi-media Room, a second sprinting room and a tiered Lecture Theatre There is low cost accommodation available at the sprint venue - Trinity College More information on the sprint: http://www.ozzope.org/2ndsprint/2ndOzSprintWiki Sprint update The Oz Zope community is excelling itself As well as having enough pledges to pay for Jim Fulton's air fare from the US to Australia. We also have a funding pledge from Melbourne University which will enable us to fly a second person to Australia. Regarding the second air fare, Jim Fulton and I had a couple of hours to choose who would use that second air fare. In deciding we first looked at the suggestions from the Oz Zope meetings and the mailing list. There had been requests to invite to this sprint one of the Lone developers also requests for user interface expert Paul Everett. As luck would have it, there is a Lone snow sprint in Austria the same week as our sprint so no Lone developers are available. Paul Everett reluctantly can't spare the time either he has a project deadline looming. We looked at the people actively working on Zope 3 and chose Garrett Smith from Chicago. GODEFROID CHAPELLE: Page Template "usage" variable Usage in Page templates has been completed during the Rheinland Sprint organized by DZUG. The following text explains the motivation and the use of the usage variable. More information can be found in app/browser/skins/README.TXT The Usage Variable A skin must manage structural elements like navigation, tabs, location breadcrumbs... Skin pages need to show all or some of those elements. o An object view (as in the Rotterdam skin) has a lot of those structural elements. o In dialog-style pages, you don't want elements such as tabs, menus, and the location bar. o For the screen used in adding a new item, you also want many items to disappear, but also to add some information specific to this screen. o In error dialogs, the location bar doesn't work, because errors have no location. One option is to manage multiple versions of the master template and applying them as whole-page macros on the various pages. But multiple master templates is cumbersome and error-prone. To solve this, the skin facility introduces a top-level TAL variable called 'usage'. The usage variable is there to allow you to maintain a unique template for a whole application. This variable has a value that sets different modes of operation. By testing usage, you can decide which blocks should be shown or hidden when rendering the template. Having a unique template eases to enforce a coherent UI and consistent look and feel by ensuring that structural elements do not move too much on the screen. The main way to set the value of 'usage' for a page is through the menu it is registered to. A menu is a set of conceptually related links to pages. When you click on one of those links, you should arrive to about the same type of UI with identical (or at least similar) information available. Getting usage from the menu will enforce (we hope) the coherence of the UI. Actually, if a page is registered to a menu, its usage value gets set from the usage value set on the menu through its ZCML directive. Anyway, usage can be overridden by initializing it through the page configuration (ZCML directive). The values of the 'usage' are chosen to describe broad categories rather than individual templates or elements. These are the proposed values: o 'usage/objectview' is the usage when browsing contents. Example: folder contents. o 'usage/activitydialog' is the usage when you are modifying an object in any way. Example: rename. o 'usage/error' is self-explanatory. o 'usage/addingdialog' is used during the process of adding a new item. Those values must be registered through the <browser:usage name="usagevalue" /> ZCML directive. The following directives share the usage attribute : o browser:menu o browser:view o browser:pages o browser:page o browser:editform o browser:subeditform o browser:editwizard o browser:addform o browser:addwizard o browser:schemadisplay The usage attribute can only be set as one of the registered usage values. As an example, the 'template.pt' master template in the 'rotterdam' skin has the following block:: <div tal:condition="usage/objectview" tal:repeat="structure view/tabs"></div> CONTRIBUTING Please send Zope 3 news, and newsletter suggestions and requests, to gary(a)zope.com, with "Zope 3 newsletter" somewhere in the subject line. As you can see above, both quick and lengthy news items are acceptable and desirable. MORE INFORMATION ON ZOPE 3 The central place to find Zope 3 information is currently http://dev.zope.org/Zope3 The Zope 3 mailing list is archived and managed at http://lists.zope.org/mailman/listinfo/zope3-dev The Zope 3 development IRC channel, #zope3-dev at irc.openprojects.net is (strictly) for discussion of Zope 3 development issues. Newsletters are (supposed to be) archived at http://dev.zope.org/Zope3/Zope3Newsletter

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RE: [Zope-dev] Where did __traceback_info__ go?
by Bjorn Stabell 22 Dec '03

22 Dec '03

Dieter: > Bjorn Stabell wrote at 2003-12-21 23:49 +0800: > >I upgraded to 2.7b3, and it looks quite solid! > > > >I have one problem, though: I can't find the "full tracebacks" that > >include __traceback_info__ anywhere! > > They are not in "http://<yourZope>/error_log"? No, the error, UnicodeError, doesn't even show up in error_log or on STDOUT. It does show up in events.log and on the error page, if I add error_tb to the standard_error_message. Nowhere, however, does the __traceback_info__ information show up. Regards, -- Bjorn

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Where did __traceback_info__ go?
by Bjorn Stabell 21 Dec '03

21 Dec '03

I upgraded to 2.7b3, and it looks quite solid! I have one problem, though: I can't find the "full tracebacks" that include __traceback_info__ anywhere! I used to start up Zope in debug mode, so I'd get everything sent to stdout. Now, stdout just contains some startup stuff; doesn't even contain simple tracebacks. The event log contains tracebacks, but it doesn't contain __traceback_info__. I'm not sure if it contains the __traceback_supplement__ stuff? On a related note, perhaps it would be more clear what got sent to stdout if stdout was just another log handler, and so it could be configured the same way other logs are configured, e.g., <logger event> <stdout> level INFO </stdout> <stderr> level WARN </stderr> </logger> Bye, -- Bjorn

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No profiling file written!
by Toni Vicens Arasanz 21 Dec '03

21 Dec '03

Hi!, I need to do some profiling with Zope, and the tool in the management console works fine, but I can't find the file where the profiling info is supposed to be written. This is what my start script says about profiling: PROFILE_PUBLISHER="/usr/local/Zope-2.6.2-linux2-x86/var/profile.log" export PROFILE_PUBLISHER But the file doesn't seem to ever come to exist! Could anybody tell me what am I missing? Thanks a lot, Toni.

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config file changes made to 2.7 branch and head
by Chris McDonough 20 Dec '03

20 Dec '03

The 2.7 branch and HEAD have been changed so that they require databases to be present in the config file to start properly. Previous 2.7 betas did not require this; in fact, there were no databases specified in the default zope.conf file, and Zope guessed at what the defaults were. Since guessing this way is bad, I've changed it to require explicit database statements in the config. To ensure that your 2.7 or HEAD checkouts start properly, place the following in your config file (or just uncomment it from the default config file): <zodb_db main> # Main FileStorage database <filestorage> path $INSTANCE/var/Data.fs </filestorage> mount-point / </zodb_db> <zodb_db temporary> # Temporary storage database (for sessions) <temporarystorage> name temporary storage for sessioning </temporarystorage> mount-point /temp_folder container-class Products.TemporaryFolder.TemporaryContainer </zodb_db>

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Localizer and UnicodeError
by Milos Prudek 20 Dec '03

20 Dec '03

I want to move my Localizer "LocalContent" instances from Localizer 0.8.1 to Localizer 1.0.1 My Zope 2.5.1 was updated with all necessary unicode patches. The problem: After converting LocalContent instances in one folder to Unicode, I cannot access the management screen. The error message is: Error Type: UnicodeError Error Value: ASCII encoding error: ordinal not in range(128) The same error is triggered when displaying the titles in that folder: script_1: for x in context.objectValues('LocalContent'): print x.id, ":" x.title return printed ... and is not trigered if I only list the ids. I believe that this kind of error appears when Zope is trying to display Unicode characters and legacy-encoded characters (such as ISO-8859-2 or Win1250) at the same time. The title attribute of LocalContent objects is displayed in the ZMI. Of course, the title attribute of LocalContent objects has many language versions, and Zope (I presume) displays in the ZMI the language version according to my browser's language setting. I do not understand why script_1 triggers it. But most importantly I do not know how to get out of this mess. This is the External script used to do the conversion to Unicode: def cvt(objVal): # for x in context.objectValues('LocalContent'): log = [] for x in objVal: log_line = x.id + ': ' local_properties = {} for id, v in x._local_properties.items(): log_line += ' ' + id local_properties[id] = {} for lang, v in v.items(): local_properties[id][lang] = unicode(v, 'cp1250') x._local_properties = local_properties log.append(log_line) return log -- Milos Prudek

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Zope and streaming
by Andre Schubert 20 Dec '03

20 Dec '03

Hi all, i have a little problem. I cant find a way howto stream data from a Zope behind Apache. My coworker was playing a little bit with mod_fastcgi, and found a way to stream data via the mod_fastcgi module in Apache. But if we tested this with a fast-cgi enabled Zope it does not work. It seems that the fast-cgi-server inside Zope sends the data in 8kByte chunks ?! Could somebody shed some light on this problem or point me to some documentation where i can read about it. Thanks in advance, as

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To the brave folks trying Zope HEAD...
by Sidnei da Silva 19 Dec '03

19 Dec '03

Has anyone run into this one? ------ 2003-12-10T14:07:53 ERROR(200) Zope Couldn't install Formulator Traceback (most recent call last): File "/var/src/zope/head/lib/python/Zope/Startup/run.py", line 27, in ? run() File "/var/src/zope/head/lib/python/Zope/Startup/run.py", line 24, in run start_zope(opts.configroot) File "/var/src/zope/head/lib/python/Zope/Startup/__init__.py", line 50, in start_zope starter.startZope() File "/var/src/zope/head/lib/python/Zope/Startup/__init__.py", line 218, in startZope Zope.startup() File "/var/src/zope/head/lib/python/Zope/__init__.py", line 46, in startup _startup() File "/var/src/zope/head/lib/python/Zope/App/startup.py", line 95, in startup OFS.Application.initialize(application) File "/var/src/zope/head/lib/python/OFS/Application.py", line 420, in initialize install_products(app) File "/var/src/zope/head/lib/python/OFS/Application.py", line 579, in install_products folder_permissions, raise_exc=debug_mode) File "/var/src/zope/head/lib/python/OFS/Application.py", line 694, in install_product get_transaction().commit() File "/var/src/zope/head/lib/python/ZODB/Transaction.py", line 254, in commit self._cleanup(objects, ncommitted, jars, subjars) File "/var/src/zope/head/lib/python/ZODB/Transaction.py", line 233, in commit ncommitted += self._commit_objects(objects) File "/var/src/zope/head/lib/python/ZODB/Transaction.py", line 352, in _commit_objects jar.commit(o, self) File "/var/src/zope/head/lib/python/ZODB/Connection.py", line 279, in commit p = w.serialize(obj) File "/var/src/zope/head/lib/python/ZODB/serialize.py", line 114, in serialize return self._dump(getClassMetadata(obj), obj.__getstate__()) File "/var/src/zope/head/lib/python/ZODB/serialize.py", line 123, in _dump self._p.dump(state) ZODB.POSException.InvalidObjectReference: Attempt to store an object from a foreign database connection -- Sidnei da Silva <sidnei(a)awkly.org> http://awkly.org - dreamcatching :: making your dreams come true http://plone.org/about/team#dreamcatcher Don't hit the keys so hard, it hurts.

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SMPT Authorization support
by Lennart Regebro 18 Dec '03

18 Dec '03

I just checked in (on regebro-esmpt_support-branch) support for setting a username and password on the mailhost. Very nice and easy fix, and lot's of people want it. But I realized that what you actually might want is to have different login and password for each user, that is a possibility to pass username + password to send(). And maybe you want a setting to allow this or not. Or is this overkill? What do you think? (This is for all for 2.8, obviously). //Lennart

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