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Second ZOPE 3 mini- NEWSLETTER (and kinda large glossary)
by Gary Poster 31 Oct '02

31 Oct '02

WELCOME TO THE ZOPE 3 MINI-NEWSLETTER: ISSUE 2 (31 OCT 2002) Find out what's going on in Zope 3 development, then contribute your opinions, your experience, and your code to one of the most exciting Open Source projects going. Most news is submitted. Tell us what you're doing! Send anything from a sentence to a few paragraphs about your latest efforts, be they code, documentation, research, or design, to gary(a)zope.com. I'll send one of these out whenever we have enough to warrant it-- just two or three submissions are enough--and I'll also specifically request news from the zope3-dev(a)zope.org group once a month. I send them to zope(a)zope.org and zope3-dev(a)zope.org (subscribe at http://www.zope.org/Resources/MailingLists) announce it on the front page of zope.org, and archive it at http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/Zope3Newsl… LITE (?) 'N' EASY GLOSSARY: Each newsletter begins with a high-level glossary that might help you understand a bit about what's going on with some of the announcements. Want to help others get a grasp on your favorite Zope 3 (or pertinent Zope 2) concept? Send in a definition, or request one, or fix these. Starred (or italicized) items have definitions also in the glossary. Only terms discussed in this newsletter or newly submitted or corrected terms are included here. For full glossary, see http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/Newsletter… [NEW] Adapter Service: a tool that, given one "component" (an object that declares an interface) and a desired resulting interface, tries to wrap the component with extra functionality that matches the desired interface (forgive the simplification!) [NEW] Forms: Allows you to create (web) forms in a structured, secure and easy way. First create the *schema*. This is just an *interface* with schema information on it. From the schema, a form can be generated automatically using widgets from an extensible set. User input to the form is then automatically converted to the value types the schema expects, and can then be validated against the schema to check whether the values fit the schema criteria. If any errors occur they can be displayed to the end user (possibly along with the form itself). (thanks to Martijn Faassen) [CORRECTED] I18N: In Zope 3, i18n covers all that is needed to have an application be able to be switched from one language to another, or being able to support multiple languages at the same time, be it for its interface or for its content objects themselves. That covers input and output encoding, translatability and actual translation of views and contents, the tools and formats necessary to provide those translations, maybe even the translation workflows that authors will use. (thanks to Florent Guillaume for the corrected definition) [NEWLY COPIED :)] Interface: a description of the behavior of objects. Zope provides objects for representing interfaces and a facility for asserting that objects implement interfaces. Interface objects were added to Zope for specification and documentation purposes. Zope 3 uses interfaces primarily for classification and for connecting components based on compatible interfaces. Future versions of Zope may utilize interfaces for type safety, as part of the security system. [NEW] Placeful: An adjective describing an object that resides in the *ZODB* (and so is persistent) and is potentially pertinent only to the ZODB branch (or "folder" and all children) in which it resides. Similar to standard programming "local" concept of variables. Opposite of *Placeless*. [NEW] Placeless: An adjective describing an object that resides outside of the typically addressed Zope database, and is available to all objects irresepective of their location in the ZODB (or what "folder" they reside in). Usually not persistent, but instantiated in memory on each program start. Somewhat similar to standard programming "global" concept of variables. Opposite of *Placeful*. [CORRECTED] Relationship Service: A proposed central place to store relationships between objects, giving some very simple and basic relational-database-like functionality. A client of the *ObjectHub*. [NEW] Schema: A Zope 3 framework built on the Interface package that allows you to specify details about attributes of the object that implements the schema. This includes type information (string, integer, etc) as well as restrictions on what values may be set (maximum length, can be None, etc) which can be automatically validated. The schema framework allows you to specify this information in an object's interface. Schema information is used by several other Zope 3 systems, such as metadata (properties) and forms. The schema package lives in 'lib/python/Zope/Schema'. (thanks to Martijn Faassen) [NEWLY COPIED :)] Sprint: A sprint is a multi-day session of intense Zope3 development organized around extreme programming (XP) ideas such as pair programming. [stolen from http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/SprintSche… which tells a lot more!] [NEW] TTW: "Through the web," usually used in reference to ideas such as "scripting TTW" or "configuring TTW" and so on. NEWS SNIPPETS: * Jim Fulton and the team in India checked in a new ErrorReportingService to the Zope3 head, as well as a lot of work on a placeful AdapterService, TTW code, and Forms in a couple of branches. I'm probably leaving whole chunks of topics out too! * Look! Up in the air! It's a glossary! It's spam! No, it's *the second Zope 3 mini-newsletter*! * uh...Happy Halloween? STEVE ALEXANDER: I spent a few days tracking down the source of the two month old bug http://collector.zope.org/Zope3-dev/78, fixing it, adding unit tests, and fixing the fix's repercussions. I've continued helping CodeWorks with their work on the cache manager. Barry Warsaw and I had a chat about what would make a good MailHost replacement for Zope 3. Some important things include transaction-aware mail delivery (so that you don't get mails sent when there are conflict errors or aborted transactions), and mail delivery in a separate thread, so it doesn't hold up a page's response. Barry's writing up a proposal on this, and I have some time put aside to help with this. I refactored the unit tests for ContextMethods, making them more elegant, and increasing their coverage. I reimplemented SimpleMethodWrapper to work better, and added in support for context-aware properties too. This is useful when you want to use properties in a Service implementation. KAPIL THANGAVELU (as hazmat on IRC): Document Autogeneration I've been working on using docgeneration tools [epydoc] to generate api docs from the z3 source. [Not from interfaces yet, from what he said, but hopefully the tools will go there!] INFRAE'S MARTIJN FAASSEN: Sprintathon Infrae is hosting a Zope 3 Content Management Sprintathon to be held december 2-6 in Rotterdam, the Netherlands. We already have an interesting and large cast of developers who are planning to attend. Even so, the room we have at our disposal is large enough to fit in several more, so if you are interested in participating, please mail faassen(a)infrae.com! One of the special features (and not strictly content management related) of the Sprintathon will be a user interface team. This team will be composed of people with a background and interest in user interfaces, to lay down some of the groundwork for the Zope 3 user interface. Other topics will include workflow and searching. If you have a topic you are interested in, please mail the zope3-dev mailing list to talk about it. See this wiki page for more information: http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/InfraeSpri… GARY POSTER: I checked in a placeful version of the ObjectHub, replacing the placeless one previously in CVS and fixing some errors and polishing the interface. Yay. I also have the most recent draft of RelationshipService proposal at http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/Relationsh… Steve Alexander and I hope to put together a first take on integrating indexing, metadata, relationships, and the ObjectHub, very very soon, so we can all complain about what we don't like and redo it.... Well, actually, I'm serious. :-) NEWS CONTRIBUTION GUIDELINES: We want to know what you're doing, be it code or design, so just write something quick and easy. First person and casual is fine, as you can see. Send to gary(a)zope.com whenever the spirit moves you. LEARN MORE ABOUT ZOPE 3: See http://lists.zope.org/mailman/listinfo/zope3-dev See http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/FrontPage but be aware the design docs often lag as we develop prototypes.

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[HELP] FTP - Limit user reached
by flemaitre＠fede.generali.fr 31 Oct '02

31 Oct '02

Hello, I use Nescape Composer in order to edit the Web content of my Zope sites using FTP. It's work great, but i have a problem : When i edit a HTML page containing few images, Composer doesn't manage to load them : in fact it does one FTP request for each image ==> I have the message : "User limit reached". Can anyone help me ? Thanks in advance. Frederic. PS : Excuse my english.

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REPLACEABLE objects and aqcuisition question.
by Clint Brubakken 31 Oct '02

31 Oct '02

I'm using Zope 2.6.0 and I have a product that creates a PageTemplateFile that is replaceable (by setting pt.__replaceable__ = REPLACEABLE ) I declare this in the method hash of my __init__.py so this PT is available even to constructors. I am having a problem that the object is replaced only in the container the replacement is in, the replacement is not acquired by sub objects. Is there a way to stop this, to make it acquire the one in its parent? -- Clint Brubakken <cabrubak(a)inetic.com> Inetic Web Development

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Formulator Problem
by beno 31 Oct '02

31 Oct '02

Hi; This post was originally sent to the ZPT list, but since no one answered... I have the following code in a ZPT page: <table tal:define="form here/email_us_formulator" align=center> <tr tal:define="yourname request/YourName|nothing"> <th align="left"> <font tal:attributes="size python:here.sizeCalc2(5,here.size())"><font face="verdana"><b> Your Name: </b></font></font> </th> <td><input type="text" name="YourName" tal:replace="structure python:form.YourName.render(yourname)"> </td> </tr> ...etc. This renders like this: <table align="center"> <tr> <th align="left"> <font size="4"><font face="verdana"><b> Your Name: </b></font></font> </th> <td><input size="20" value="" type="text" name="field_YourName" /> </td> </tr> ...etc. When the form is submitted, it goes to a page with the following code: Thank you, <p tal:replace="structure python:here.email_us_formulator.YourName">YourName</p>! and renders like this: Thank you, <StringField instance at 8f2dec8>! What have I done wrong? Furthermore, Formulator no longer validates at all for some reason. Why? TIA, beno

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Getting Zope to fetch info via HTTP
by Johan Lübcke 31 Oct '02

31 Oct '02

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello I have a need to make Zope fetch information from a (slow) external source via HTTP. Would using an ExternalMethod with a call to urllib2 be the right way or would that lock up the thread until the external call returns? Is there in that case any way to allow medusa to do other stuff while the information is not yet available? ...or should I not worry and just increase the number of threads instead? ~ / Johan Lübcke -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6-2 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAj3AS/sACgkQ9BeRmxxhT981pgCcCIaJMXlcn30ZxR8ROUFGtqI7 6KMAn3TX84RQI/Nw+vmRhsp7c5HDihox =ObSw -----END PGP SIGNATURE-----

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Helpppp - Problems with big files
by Antonio Beamud Montero 31 Oct '02

31 Oct '02

Hi again: In a request I need to response a big file in the body of the response (around 1Gb or 1,5Gb). All I do is: response.setHeader('content-lenght',size) response.setHeader('content-Disposition',loc) f.open('file') data = f.read() response.write(data) sometime later Zope writes a "memory error". I have divided the data in little chunks too and make a lot of response.write calls, but the problem persist... How I can resolve this problem?... is very important... Thanks... -- Microsoft merges technologoies: Windows CE + Windows ME + Windows NT = Windows CEMENT ---- Antonio Beamud Montero Agora Systems S.A. http://www.agoratechnologies.com

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Create Reports as PDF
by Martin Gebert 31 Oct '02

31 Oct '02

Hi all! I've just read the "Create a PDF on the fly" How-To, so creating a document (ZPT or DTML) which gets downloaded as PDF shouldn't be a real problem. But there's one question left: I'd like to create a report which exists primarily of tables (about 4 or 5 per document) plus header and footer. Can I avoid that the page break appears in the middle of a table, and how? You know, like the most report generators do if you tell them "don't split this group" or something similar... Thanks! Martin

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Now my zope won't start.
by harry lee 31 Oct '02

31 Oct '02

Drop back 10 yards, and install on c, I guess

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session invalidate - using python
by p.t. 30 Oct '02

30 Oct '02

Using this simple script, I expected that a None should be returned (according to http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/Sessions.stx) data = context.session_data_manager.getSessionData( create=0 ) data.invalidate() return str( data ) # str() just to see None But a result like this is allways returned: id: 10360120480192202025, token: 54001646A0iEAi2X9io, contents: [] with id change at each call (token is the same because the browser is the same). A new session is ceated at each hit (refresh) in the same browser: and the counter in the transient object container is increased accordingly. I did put Data object timeout value in minutes = 1, but after 30 minuts a new hit increase the counter. Does create=0 work properly? Does invalidate() work at all? What am I doing wrong? Thanks for help. p.t.

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Error adding an external method
by harry lee 30 Oct '02

30 Oct '02

I'm installing the mailin functionality to zwiki. I put mailin.py into externals, when I added external method, it reported a syntax error on line 32. line 32 is: >From types import * I checked and I have types.py? Both in python and under my zope site. I just uninstalled python on the logic that maybe something didn't like both. Clues anyone?

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