July 2003 - Zope - Zope lists

Ninth Zope 3 Newsletter
by Gary Poster 25 Jul '03

25 Jul '03

WELCOME TO THE ZOPE 3 NEWSLETTER: ISSUE 9 (25 JULY 2003) Welcome to the ninth 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: - Jim Fulton released the third Zope X3 milestone release on June 30. A few "geddon"s (big changes to Zope 3) are still planned before the beta release. - The Australian OzZope Zope 3 sprint, organized by Jan Smith, was a big success. See http://www.ozzope.org/OzSprintWiki for a fun summary, and http://www.ozzope.org/news/LinMagAu for a link to a nice explanatory interview about Zope, Zope 3, and sprints with Jan. FRED DRAKE: Vocabulary Fields and Widgets A vocabulary is an object which represents a collection of distinct values (where distinct means that any two of them compare as not equal using !=, and no two compare equal using ==). These are most interesting when the set of values is highly dynamic. A vocabulary may be provided by (for example) some object in the ZODB, a query to an external database, the contents of a file maintained by another process, or static data provided by a separately maintained piece of code. Vocabulary fields provide a field type for situations in which the set of options is defined by a vocabulary. This is most useful when the set of possible values may be highly dynamic or otherwise be decoupled from the schema definition itself. A vocabulary field in a schema contains either a vocabulary object (``IBaseVocabulary``) or the name of a vocabulary. If a name is used, the specific vocabulary to use will be supplied by a registry when the schema field is bound to an instance of a content object. Entries in the registry may be made through an API or using ZCML. More information is available in the Zope 3 source tree in the file doc/schema/vocabularies.txt. This is an especially important document to read before creating or configuring widgets to use with vocabulary fields. ZConfig for Zope 3 (Submitted June 30) Zope 3 will be using a configuration file defined by a ZConfig schema for site administration. This change is intended to make the operation of a site easier for system administrators to work with. Additional configuration parameters will be added to the configuration file during the continuing development of Zope 3. PHILIPP VON WEITERSHAUSEN (submitted July 1): XML: After Martijn Faassen and I had implemented a first bit of XML in Zope3 in Louvain-la-Neuve, I thought it was time again to advance things in that department. After discussing things with Martijn on IRC, I moved all zopeproducts concerning XML to one zopeproducts.xml package. The ParsedXML DOM implementation, which Martijn had ported to Zope3 looked like the most advanced part of the whole xml package. It was not yet ready to be used as components though, so I wrote interfaces for the DOM, following the W3C specs tightly, and added ZCML configuration directives for the classes. I also attempted to implement something like ParsedXML in the form of DOM Document, which was simply a persistent document node. While providing views for it and simple adapters to and fro IXMLText (XML contained in a string) was - thanks to the CA - quite easy, trying to implement editing capabilities turned out to be a trip with much ContextWrapper pain, so I finally had to give up realizing that ContextWrappers were not the right choice for a DOM implementation. Martijn had used them because ParsedXML's DOM implementation used acquisition and ContextWrappers are its successors. It is therefore questionable whether we will hang onto this DOM implementation. It is also questionable whether we will have to implement our own DOM at all. In order to store a DOM persistently, we will most certainly have to, but it would be wise to research use cases first before starting to re-implement the whole DOM API. XHTML compliance ("xhtml-gheddon"?): When browsing through some page templates I realized that a lot of the times, XHTML compliancy was neglected. Thus I validated all page templates against XHTML 1.0 Transitional with the xmllint command line tool from http://xmlsoft.org/ and corrected all obvious errors that it reported. Unfortunately, the tool was very disturbed by the TAL and METAL namespaces and the flood of error messages was enormous, so I might have missed a few errors. I am yet looking for a solution to this problem, so that we can maintain XHTML compliance by validating page templates once in a while. For all emacs users: I used emacs's grep-find mode entering the following command:: find . -name "*pt" -exec xmllint --noout --dtdvalid \ http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd {} \; The grep-find mode can parse this output. Instead of specifying the URL, one can also download the DTD to speed up the process. Zope products: I kept a few zopeproducts up to date with the changes in Zope3 head (package refactorings, new-style implements, configuration -> registration). Most time I spent on the NewsSite product which was grossly out of date. I got it to work so that I could add a news site and news entries, but it's not pretty. This question goes out to both the initial developers (participants of the DZUG sprint) and other people interested in this product: is anyone willing to take further care of this product? If it is only kept up to date with changes in Zope3, it will remain in its miserable state for eternity. Then we might just as well remove it. CHRISTIAN THEUNE: Zope Security evaluation gains speed The Zope Security Evaluation aims at getting Zope 3 security mechanisms certified with a "common criteria certificate" which is an approved certificate within 15 countries. (http://www.commoncriteria.org) During the 9. and 10. july there was a workshop at the TUV-IT (http://www.tuev-it.de) which included Steve Alexander, Aroldo Souza-Leite, 3 people from the TUV and me. We have begun explaining them the Zope 3 security model which produced a fair explicit layout of components that are involved and started writing the documentation of the security target which means determining the components that belong to security, possible threats to them as well as selecting functional and environmental security requirements and objectives to defend against those threats. We gained a pretty good picture of what the certificate will give us (better understanding of the whole complexity of the security machinery) and that even the entry level certification means a lot of explanation work and in-front work I now continue writing the security target and am aiming to finish it before end of june (which is some kind of unlikely but possible). Everybody who likes to see the progress of the certification work can find a page including the schedule in the "Subprojects" area of the Zope3 Wiki named "SecurityEvaluation". Also there are first checkins within the Zope 3 file tree to find under Zope3/doc/security. The documentation format is reStructuredText and is additionally checked in as a rendered .html file. Stay Zope3ed. STEPHAN RICHTER Documentation I have made significant progress with the Zope 3 Development Cookbook. The "Content Components" section with 12 recipes (roughly 124 pages) is now done, some in outline form and others fully written out. The source code can be found at ZopeProducts/demo/messageboard. The recipes build a message board product from scratch and start out relatively easy and become then more involved. There are a couple other recipes dispersed throughout the book outline, which you can find at http://dev.zope.org/Zope3/DevelCookbook. For everyone who does not know yet, the Zope 3 Python Developers Cookbook will be published by Sams (same people as New Riders who did the Zope Book). I will be the primary author, and Jim and Steve signed up as technical editors. The book will be published under an open content license (http:// creativecommons.org/licenses/by-nd-nc/1.0/) Please send me or post comments about the recipes. The more early feedback I have, the better the book will be! Online Help While writing the recipes, I also fixed the Online Help to look for views correctly. One of the above mentioned recipes (http://dev.zope.org/Zope3/ OnlineHelpForZopeApps) has detailed information on how to use it. The Zope 3 Development team would like to encourage people to start developing help screens. SQLExpr Alan Runyan had the great idea to support a TALES expression that would evaluate SQL statements. Short story: He told me, 2 hours later it was done. The syntax looks as follows:: <html tal:define="rdb string:PsycopgDA; dsn string:dbi://test"> <body> <ul tal:define="name string:Stephan; table string:contact"> <li tal:repeat=" contact sql: SELECT * FROM ${table} WHERE name = '${name}'"> <b tal:content="contact/name" /> </li> </ul> </body> </html> The add-on is mainly aimed at scripters, who do not want to worry about design so much. You can find the product at http://cvs.zope.org/ZopeProducts/ sqlexpr. BTW, I think it would be easy to port this code to Zope 2, since very little is Zope 3 specific. Making zope3.org our Home It has been in our heads since last year, but we did not have the time to do it (other than registering the domain). But now it is time! We have a ZWiki product and soon I will also have a Bug Collector ready for Zope 3, so that we can start moving the content over to www.zope3.org. I hope to be able to move there in the next weeks. 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, casual and quick news items are acceptable and even 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, blame the editor) archived at http://dev.zope.org/Zope3/Zope3Newsletter

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upgrading from Zope2.5 to Zope2.6 - ZClasses broken?
by Anthony Baxter 25 Jul '03

25 Jul '03

I'm upgrading from Zope2.5ish to Zope2.6.2 at the moment. Attempting to start up, I'm getting a bunch of errors like: 2003-07-24T09:30:31 ERROR(200) ZODB Couldn't load state for '\x00\x00\x00\x00\x00\x00\x00\x97' Traceback (innermost last): File /export/01/zope/beta_ekit_code/lib/python/ZODB/Connection.py, line 551, in setstate File /export/01/zope/beta_ekit_code/lib/python/ZODB/Connection.py, line 587, in _set_ghost_state File /export/01/zope/beta_ekit_code/lib/python/ZODB/Connection.py, line 209, in _persistent_load (Info: ) File /export/01/zope/beta_ekit_code/lib/python/ZODB/Connection.py, line 148, in __getitem__ (Info: ('\x00\x00\x00\x00\x00\x00\x04\x92', '(cExtensionClass\nExtensionClass\nq\x01(U\x12ekitClassOfServiceq\x02(cZClasses.ZClass\nPersistentClass\nq\x03cZClasses.ObjectManager\nObjectManager\nq\x04cProducts.ZCatalog.ZCatalog\nZCatalog\nq\x05cOFS.SimpleItem\nSimpleItem\nq\x06tq\x07}q\x08(U\x07cosNameq\tU\x00U\n_p_changedq\nK\x01U\x07__doc__q\x0bU\x15ekit Class Of Serviceq\x0cU\x0efeatureClassesq\r]q\x0eU\x10findFeatureClassq\x0f(U\x08\x00\x00\x00\x00\x00\x0b\xc8\xdcq\x10(U\x0fZClasses.Methodq\x11U\x03MWpq\x12ttQU\x14_v_manage_path_rolesq\x13U\x00U\x06_p_oidq\x14U\x08\x00\x00\x00\x00\x00\x00\x04\x92q\x15U\x0cCOS_find_allq\x16cZClasses.Method\nMW\nq\x17NRq\x18}q\x19U$_ZClassMethodPermissionMapperMethod_q\x1a(U\x08\x00\x00\x00\x00\x00\x00\x057q\x1b(U\x0eOFS.DTMLMethodq\x1cU\nDTMLMethodq\x1dttQsbU\tmeta_typeq\x1eU\x15ekit Class Of Serviceq\x1fU\x0epropertysheetsq U\x08\x00\x00\x00\x00\x00\x00\x04\x93q!QU\x14isPrincipiaFolderishq"U\x01YU\x12__ac_permissions__q#)U\x04iconq$UGC ontrol_Panel/Products/ekitClassOfService/ekitClassOfService/ziconImageq%U\t_p_serialq&U\x08\x03F\xad\x83\r)\xa0Uq\'U\x0clistFeaturesq((U\x08\x00\x00\x00\x00\x00\n\xcf\x15q)(h\x11U\x03MWpq*ttQU\x12listFeatureClassesq+(U\x08\x00\x00\x00\x00\x00\n\xce\x98q,(h\x11U\x03MWpq-ttQU\nmeta_typesq.(}q/(U\npermissionq0U\x11Edit ekit Partnerq1U\x04nameq2U\x15ekitPartnerHTMLFolderq3U\x07productq4U\x0bekitPartnerq5U\x06actionq6U;manage_addProduct/ekitPartner/ekitPartnerHTMLFolder_factoryq7u}q8(h0U\x11Edit ekit Partnerq9h2U\x17ekitPartnerImagesFolderq:h4h5h6U=manage_addProduct/ekitPartner/ekitPartnerImagesFolder_factoryq;u}q<(U\npermissionq=U\x16Add ekitCOSMenuFoldersq>U\x04nameq?U\x11ekitCOSMenuFolderq@U\x07productqAU\x12ekitClassOfServiceqBU\x06actionqCU>manage_addProduct/ekitClassOfService/ekitCOSMenuFolder_factoryqDu}qE(U\npermissionqFU\x10Add ekitPartnersqGU\x04nameqHU\x17ekitPartnerScriptFolderqIU\x07productqJU\x0bekitPartnerqKU\x06actionqLU=manage_addProduct/ekitPartner/ekitPartnerSc riptFolder_factoryqMu}qN(U\npermissionqOU\x0bAdd FoldersqPU\x04nameqQU\x10MLDTML ContainerqRU\x07productqSU\rMLDTML_ZClassqTU\x06actionqUU7manage_addProduct/MLDTML_ZClass/MLDTMLContainer_factoryqVu}qW(hOU\x15Add MLDTML ContainersqXhQU\x1dUpgrade Folder to MLContainerqYhShThUU>manage_addProduct/MLDTML_ZClass/MLDTMLContainer_upgradeFactoryqZu}q[(U\nvisibilityq\\U\x06Globalq]U\ninterfacesq^]q_(cInterface.iclass\nInterface\nq`oqa}qb(U\x11_Interface__attrsqc}qd(U\nhttp__etagqe(cInterface.Method\nMethod\nqfo}qg(U\x07__doc__qhT:\x03\x00\x00 Entity tags are used for comparing two or more entities from\n the same requested resource. Predominantly used for Caching,\n Etags can also be used to deal with the \'Lost Updates Problem\'.\n An HTTP Client such as Amaya that supports PUT for editing can\n use the Etag value returned in the head of a GET response in the\n \'if-match\' header submitted with a PUT request. If the Etag\n for the requested resource in the PUT request\'s \'if-match\' header\n is different from the current Etag value returned by this method,\n the PUT will fail (it means that the state of the resource has\n changed since the last copy the Client recieved) because the\n precondition (the \'if-match\') fails (the submitted Etag does not\n match the current Etag).\n qiU\x08optionalqj}qkU\x08requiredql)U\x08__name__qmU\nhttp__etagqnU\tinterfaceqoU\x11EtagBaseInterfaceqpU\x07varargsqqNU\x06kwargsqrNU\npositionalqs)ubU\x11http__refreshEtagqt(hfo}qu(hhT\x17\x02\x00\x00 While it may make sense to use the ZODB Object Id or\n bobobase_modification_time to generate an Etag, this could\n fail on certain REQUESTS because:\n\n o The object is not stored in the ZODB, or\n\n o A Request such as PUT changes the oid or bobobase_modification_time\n *AFTER* the Response has been written out, but the Etag needs\n to be updated and returned with the Response of the PUT request.\n\n Thus, Etags need to be refreshed manually when an object changes.\n qvhj}qwhl)hmU\x11http__refreshEtagqxhohphqNhrNhs)ubuhhU\x8f Basic Etag support interface, meaning the object supports generating\n an Etag that can be used by certain HTTP and WebDAV Requests.\n qyU\t__bases__qz((h`oq{}q|(hc}q}hhU\x00hz)hmU\tInterfaceq~ubthmhpubaU\x06actionq\x7fU/manage_addProduct/ColourDefinitions/add_coloursq\x80U\npermissionq\x81U\x16Add ColourDefinitionssq\x82U\x04nameq\x83U\x11ColourDefinitionsq\x84U\x07productq\x85U\x11ColourDefinitionsq\x86U\x08instanceq\x87cProducts.ColourDefinitions.ColourDefinitions\nColourDefinitions\nq\x88utq\x89U\nsidebar_idq\x8aU\x00U\x0emanage_optionsq\x8b(}q\x8c(U\x05labelq\x8dU\x08Contentsq\x8eU\x06actionq\x8fU\x0bmanage_mainq\x90u}q\x91(h\x8dU\tcatStatusq\x92h\x8fU\x14manage_catalogStatusq\x93u}q\x94(h\x8dU\x07catFindq\x95h\x8fU\x12manage_catalogFindq\x96u}q\x97 (h\x8dU\ncatIndexesq\x98h\x8fU\x15manage_catalogIndexesq\x99u}q\x9a(h\x8dU\tcatSchemaq\x9bh\x8fU\x14manage_catalogSchemaq\x9cu}q\x9d(h\x8dU\x07catViewq\x9eh\x8fU\x12manage_catalogViewq\x9fu}q\xa0(U\x05labelq\xa1U\x05propsq\xa2U\x06actionq\xa3U\x1bpropertysheets/Basic/manageq\xa4u}q\xa5(U\x05labelq\xa6U\x04Undoq\xa7U\x06actionq\xa8U\x0fmanage_UndoFormq\xa9utq\xaaU\nziconImageq\xab(U\x08\x00\x00\x00\x00\x00\x00\x08\xd5q\xac(U\tOFS.Imageq\xadU\x05Imageq\xaettQU\n__module__q\xafU\x19*DcZsd16v0GINW4Q0bKwS+Q==q\xb0utq\xb1t.N.')) Could not load oid , pickled data in traceback info may contain clues ------ 2003-07-24T09:30:31 PROBLEM(100) ZODB Could not import class 'ekitFeatureClassManager' from module '*WOt2TN01Xz9xcOmSiE3GXg==' The "may contain clues" line is a nice touch. It _may_ indeed contain clues, but I'm stuffed if I can see what they might be... Anyone? Anthony

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Problem with Zope 2.7.0-b1
by Jean Baltus 25 Jul '03

25 Jul '03

Hi all, The problem I describe here does NOT appear with Zope 2.6.1, nor Zope 2.6.2b4, only with Zope 2.7.. I installed Zope 2.7 with CMF 1.4, Plone 1.1alpha2 and TranslationService 0.4. When I create a Plone site (called dice here) I've got the following error: AssertionError Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 161, in publish_module * Module Products.Localizer, line 58, in new_publish * Module ZPublisher.Publish, line 125, in publish * Module Zope.App.startup, line 202, in zpublisher_exception_hook * Module ZPublisher.Publish, line 98, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 39, in call_object * Module Products.CMFCore.PortalContent, line 116, in __call__ * Module Shared.DC.Scripts.Bindings, line 252, in __call__ * Module Shared.DC.Scripts.Bindings, line 283, in _bindAndExec * Module Products.CMFCore.FSPageTemplate, line 189, in _exec * Module Products.CMFCore.FSPageTemplate, line 122, in pt_render * Module Products.PageTemplates.PageTemplate, line 95, in pt_render <FSPageTemplate at /dice/document_view used for /dice/index_html * Module TAL.TALInterpreter, line 200, in __call__ * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 672, in do_useMacro * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 409, in do_optTag_tal * Module TAL.TALInterpreter, line 394, in do_optTag * Module TAL.TALInterpreter, line 389, in no_tag * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 672, in do_useMacro * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 614, in do_loop_tal * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 407, in do_optTag_tal * Module TAL.TALInterpreter, line 389, in no_tag * Module TAL.TALInterpreter, line 244, in interpret * Module TAL.TALInterpreter, line 562, in do_insertTranslation AssertionError: (60, 12) (Also, an error occurred while attempting to render the standard error message.) The behavior is the same with Linux and Windows platform. If you remove translation service, the error disappears (but it used to work with older Zope version. that's why I think the problem is in Zope 2.7). Any idea? Regards, -- Jean

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python(script) passing parameters with RESPONSE.redirect
by AdvertisingDept 25 Jul '03

25 Jul '03

if I call from a python script... context.REQUEST.RESPONSE.redirect(context.WhereTo.absolute_url()) is it possible to pass some parameters along with the redirect? Can these parameters be set so they may become part of the REQUEST for the WhereTo object?

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how can I give parameters to zope when it is started as windows service
by robert 25 Jul '03

25 Jul '03

Hi all, I would like to pass a -L parameter to a Zope instance that runs as windows service. Can anybody point me to informations how to do that thanks Robert

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button instead of textlink and checking selection
by Michael Bleijerveld 25 Jul '03

25 Jul '03

Hi all, 1) Instead of using the textlink Next I want to use a button (form) ? How can I establish this ? <dtml-if next-sequence> <a href="<dtml-var URL><dtml-var sequence-query>query_start=<dtml-var next-sequence-start-number>"><br>Next<dtml-var next-sequence-size></a> </dtml-if next-sequence> 2) How can I check if REQUEST[''ids] is not empty when using <dtml-call "manage_delObjects(REQUEST['ids'])"> ? Thanks in advance. Michael

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Manage roles and workflow...
by Gelin Patrick 25 Jul '03

25 Jul '03

Hi, 1. I created a new role called 'MA1' 2. I created a CMF topic folder called 'FolderMA1' at my Plone site root, its state is visible 3. In folder security of 'FolderMA1', I configured 'MA1' a full access to the content of 'FolderMA1' When a user with role MA1 log in my plone site he can't see FolderMA1. I think it's because I don't know how to say that objects in visible states can be view by MA1 role. How can I do? Thanks. Patrick Gelin

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Windows and Linux
by Michael Bleijerveld 25 Jul '03

25 Jul '03

Hi, I have developed some portal under Zope for Windows (version 2.6.1) and now I am testing it under Suse Linux 8.2. Under Windows it's working perfectly, however under Linux I get the following error "Key Error: Anonymous User". Has anyone idea's what the problem is ? Regards, Michael

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access list directly through its index in zope
by Ashish Thapliyal 25 Jul '03

25 Jul '03

Hi i have written a python script for ordered folder orderFolder: ------------------------------------------- list=[] for folder in context.objectValues('Folder'): list.insert(folder.getProperty('order'),folder) return list ------------------------------------------- i am able to use it using tal also -------------------------------------------- <table border=1 tal:define="subfolders python:here.orderFolder"> <tr tal:condition="subfolders" tal:repeat="folder subfolders"> <td> <a href="folder" tal:attributes="href python:folder.absolute_url()+'/managesitemap'" tal:content="folder/getId">folder id</a> </td> </tr> </table> --------------------------------------------- but i want to access the subfolders list directly(through its index) like subfolders[0].absolute_url() instead of going through a loop and accessing like folder.absolute_url() Thanks in Advance Ashish

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Zope dies unexpectedly (segfault?)
by VanL 24 Jul '03

24 Jul '03

Hello, I have a database that I am trying to update, that for various reasons, I cannot get a direct connection to. I use an external class that I have used in other situations with no problems Thus, I have a setup that looks like the following: Form -> -> script that processes the form, outputs dict -> -> script that takes dict, calls external method -> -> external method that updates db, returns num rows updated -> -> script that formats output for web -> Output display in browser I have each step here covered with try/excepts, especially the call out to the external method. Here is the text of the external method: import sys, traceback from team.database import interface def exceptional_circumstances(): return '<br>'.join(traceback.format_exception(*sys.exc_info())) def update_adapter(self, updates, key, commit=0): try: db = interface.DB() updates = db.split_update(updates) result = db.standard_update_by_key(updates, key, commit) except: return exceptional_circumstances() return result I have used this same interface before from different contexts, but when I try to use it here, Zope (apparently) segfaults. A python core file is left behind, and no trace of any exception is logged in any log that I can find. (checked /error_log, the zeo log, and the zope process log on disk) Does anybody know why this is happening? Has anybody seen something similar, or better yet, fixed something similar? Thanks, VL

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