- Zope - Zope lists

Re: [Zope] Newbie: Build Object Names
by Dieter Maurer 17 Jul '00

17 Jul '00

Terry Babbey writes: > I find I am really struggling trying to learn the syntax and variables for > the various commands. Would an understanding of Python help me to understand > the Zope > commands better and is there good documentation for Python that does not > expect the reader to have a large background knowledge? I do not think that an understanding of Python will help you much with DTML (of cause, it would not harm but help, but not too much). In DTML, you only have to do with Python expressions: you see them enclosed in "...". Python expressions are a small part of Python (which is small by itself!). You have: the usual arithmetic operators: +, -, *, /, % strings: enclosed in '...', '''...''' or "...", """...""" (the two latter forms will not work in DTML!) lists: [], [1,2,3], ['a','b','c','d'] with methods "append(element)" and "insert(where,element)" (and some more) tuples: (), (1,), (1,2,3,), ('a','b') with '+' as concatenation and [i] for subscription dictionaries: {}, { 1: 'a'}, { 'a' : 'AAA', 'b' : 'BBB',} i.e. sets of key/value pairs. They support "[key]" for subscription. They have methods "update(dict)" and "clear()", "get(key,default=None)". functions: called by "function(argumentlist)", e.g. "int('0')", "sql_method(user='dieter',city='St. Ingbert') Arguments can be positional or keyword. Arguments can have default values and then be omitted in function calls. instances (of classes): with the infix '.' operator for attribute/method access: e.g. "[].append(1)", "[].insert(0,'a')", "object.id". Functions of instances are called methods. They have as implicit (on call) first argument the object they belong to. exceptions: raised with "raise" and catched with try: protected code except: exception handling uncaught exceptions produce the tracebacks you sometimes see in Zope error pages. Strings, lists, and tuples together are called sequences. They are '+' as concatenation, '*' as repetition and '[i]' as subscription. You can use the infix operator 'in' to test for containment. The "len" function can be used to determine the number of elements. Like all object oriented systems, Python relies heavily on object classes and extension modules. They are much more voluminous and complex than Python itself. One such framework (set of intertwined modules and classes) is Zope. It, itself, is far more complex than the complete Python. Especially, its namespace handling and the powerfull acquisition adds significantly to the complexity. If you need them, you must get aquainted with the methods of the various Zope objects (folders, images, DTML methods, DTML documents, ...), too. The namespace object "_" provides much of the interface to Python. Look at its documentation in the DTML guide. In general, you do not need all arguements of DTML tags or Zope objects. You should have a rough feeling, what is there and go into details when you need it. Dieter

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Re: [Zope] DTML?
by Dieter Maurer 17 Jul '00

17 Jul '00

R. David Murray writes: > On Tue, 11 Jul 2000, Chris Withers wrote: > > Tino Wildenhain wrote: > > > I want that too. When we are over it, how about replacing (or at least > > > aliasing) > > > these - variables to _ ? sequence-item, sequence-index etc. comes to > > > mind. > > > > IF you've got a patch that will do this, please mail it to me and stick > > it in the collector... > > Note that DC has in the (recent) past expressed reluctence to do > this. I don't understand why. Something about namespace pollution? I understand the namespace problem. However, a prefix "dtml_" (or something similar) may be a better solution than using letters not allowed in Python names. Dieter

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Re: [Zope-dev] SQL-Methods
by Dieter Maurer 17 Jul '00

17 Jul '00

Andre Schubert writes: > i ave a problem, i do some sql-queries in my python product and would > return the results like the ZSQLMethods. > How do i have to return the data and field names from my python product > to an dtml document so that i can work with it like ZMYSQL. "dtml-in" expects its argument to behave like a sequence of objects. It makes the current object's attributes available for direct access. Z SQL Methods use the class "Shared.DC.ZRDB.Results.Results" for results which in turn uses a subclass of "Shared.DC.ZRDB.Record" to wrap the rows. Look at the code in "Shared/DC/ZRDB" on how to use them. Dieter

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MetaPublisher DB - was linuxworld article
by Mark Pratt 17 Jul '00

17 Jul '00

hi, Gijs Reulen wrote: > Has anyone at Digital Creations yet taken a look at > Beehive's MetaPublisher ? I think that is the way to go > for the short term (Studio being long term) ! Nice > looking browser interface, combining data and > databases, wizards, etc. before people get confused when gijs is referring to "databases" in the above statement he`s referring to a MetaPublisher version which he and a few other brave members of the MetaPublisher mailinglist are currently testing. this version gives users a choice whether to store data in the ZODB or in an external relational DB. this version will come with a few other goodies --- but we prefer to keep some things a surprise. regards, mark -------------------------------------------------------------- mark pratt (managing director) mark(a)beehive.de beehive elektronische medien GmbH http://www.beehive.de phone: +49 30 847-82 0 fax: +49 30 847-82 299

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Re: [Zope] DTML Problem (from the newbie "hair ripper" category)
by Dieter Maurer 17 Jul '00

17 Jul '00

Darin Lee writes: > Here is the proverbial rub. If I want to *test* for the presence of > "navigation_name" so I can print "title_or_id" if it's not defined, Zope > simply skips the "navigation_name" property. It's like it always evaluates > to false! > <dtml-in "objectValues(['Category'])"> > <dtml-with sequence-item> > <dtml-if "hasProperty('navigation_name')"> > <dtml-var navigation_name> > <dtml-else> > <dtml-var title_or_id> > </dtml-if> > </dtml-with> > </dtml-in> > > Doesn't work! I do not yet know the method "hasProperty". As a short term work around, you may try directly: <dtml-if navigation_name> <dtml-var navigation_name> <dtml-else> <dtml-var title_or_id> </dtml-if> This may acquire "navigation_name". Thus, you may restrict namespace lookup with: <dtml-with sequence-item only> <-- code above--> </dtml-with> Dieter

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Re: [Zope] MetaPublisher DB - was linuxworld article
by Gerard Metrailler Jr. 17 Jul '00

17 Jul '00

Hello, At 22:28 16.07.2000 +0000, Chris Withers wrote: >Mark Pratt wrote: > > > Sorry if that's a dumb question ;-) > > > > no, it`s not a dumb question. MetaPublisher is open source. > >Written in Zope? > >Where can I find out more? Give a look at http://hive.beehive.de/Beehive/www.beehive.de/Zope/MetaPublisher . The announce on zope.org is available under http://www.zope.org/Members/beehive/metarelease_html . Best regards, Gérard Métrailler Jr.

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upgrade to 2.2 and zsql methods problems
by Erik Myllymaki 17 Jul '00

17 Jul '00

Hello, I just upgraded to 2.2 from 2.1.6 on a WinNT machine. Things went well, except my zsql methods won't run from the site. I can manage and test them from the management pages, but if I call them from the site I get an *unauthorized* error. This happens even wen I log in as superuser or the owner of that zsqlmethod object. I have tried to recreate some of the queries from scratch and applying new ownership and wide open permissions, but this doesn't seem to work either. Zope is running as a service and I am using the ODBC adapter to connect to MSSQL Server. As I say, the queries all un as expected from the management test screens. Any ideas? Thanks, Erik Myllymaki erik(a)pacific-shores.com

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Re: [Zope] ZCatalog
by Chris McDonough 17 Jul '00

17 Jul '00

Jonathan Desp wrote: > > Hi Chris, > > thanks alot for your help, > > You said: > > > <dtml-var title> > > > > You would replace it with: > > > > <a href="<dtml-var "catalog.getpath(data_record_id_)">"> > > <dtml-var title> > > But there is no <dtml-var title> > > I think it's the right file "Report" though, he said: > > "To fix this, go to the management view of report. report is called by > search to display the results from catalog. " > > do you know what I should change if <dtml-var title> is not there ? You've got the right method. Replace <dtml-var raw> with <a href="<dtml-var "catalog.getpath(data_record_id_)">"><dtml-var title></a> The tutorial is getting a little long in the tooth. > here is my source for the "Report" file: > > _________________________ > > <dtml-var standard_html_header> > <dtml-in s size=50 start=query_start> > <dtml-if sequence-start> > > <dtml-if previous-sequence> > > <a href="<dtml-var URL><dtml-var sequence-query > >query_start=<dtml-var > previous-sequence-start-number>"> > (Previous <dtml-var previous-sequence-size> results) > </a> > > </dtml-if previous-sequence> > > <table border> > <tr> > <th>Raw</th> > </tr> > > </dtml-if sequence-start> > > <tr> > <td><dtml-var raw></td> > </tr> > > <dtml-if sequence-end> > > </table> > <dtml-if next-sequence> > > <a href="<dtml-var URL><dtml-var sequence-query > >query_start=<dtml-var > next-sequence-start-number>"> > (Next <dtml-var next-sequence-size> results) > </a> > > </dtml-if next-sequence> > </dtml-if sequence-end> > > <dtml-else> > > There was no data matching this <dtml-var title_or_id> query. > > </dtml-in> > > <dtml-var standard_html_footer> >

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Re: [Zope] strange pcgi prob in FreeBSD
by Peter Haight 17 Jul '00

17 Jul '00

I had this problem as well. The problem is that there is some bug or something where FreeBSD is limiting the transmission of data over the UNIX domain sockets to 8192 bytes so only pages that are less than that size work. To fix it, run the following as root: sysctl -w net.local.stream.recvspace=65536 sysctl -w net.local.stream.sendspace=65536 That will let it work with pages up to 64k. I think this is some FreeBSD problem, but I'm not sure. The send() should block instead of returning with only 8k sent. > While trying to update the zope port for the FreeBSD ports system I > ran into a problem which kinda has me stumped. I looked thru the > ML archives, but couldn't come up with anything, although I'm sure > this has happened before. > > Everything runs normal when I just connect to ZServer. Running > it thru Apache I get (sometimes): > > Temporarily Unavailable > > The resource you requested is temporarily unavailable - please try aga >in later. > > (116) unable to connect, fd=4 >

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ZStylesheet
by Neil Burnett 17 Jul '00

17 Jul '00

Warning: This is a 'get it off my chest' e-mail. Well, I am going to give up with CSS. I am sure ZStylesheet is a fine product, its just that CSS implementations lets it down. I have struggled for ages to get anything more sophisticated than font-family* to work on both IE5 and Netscape 4.6 - no chance. It seems they have both implemented CSS from a different hymn sheet :-( Basically, nothing to do with sizes works the same, and it boils down to Netscape ignoring the inheritance model of CSS. table rows and cells are a particular mystery. If anyone has cracked it and has developed a ZStylesheet which can second guess both browsers, please let me know. Until then, I will go back to using <font size="12pt"> or whatever. Shame, but I have more interesting things to worry about. Regards Neil *even font-family doesn't work for the BODY selector. Tables in Netscape ignore it so you have to use BODY TR TD as the selector.

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