December 2000 - Zope

On DTML and Python Script.
by Jason C. Leach 04 Dec '00

04 Dec '00

hi, For Christmas I'd like a way to be able to use PHP or ASP type scripting rather than DTML. like: %py> My python Script or Code. <py% Or <dtml> My DTML. </dtml> Having to manager all those dtml <> and tags is not as good as it could be. I suspect it's more of a deturant than anything else. I do agree that DMTL should be use as little as possible with Python used for anything over 10 lines. But why have a scripting language for both methods over and under 10 lines? j. ...................... ..... Jason C. Leach ... University College of the Cariboo. ..

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Re: [Zope] confusing access error
by Dieter Maurer 04 Dec '00

04 Dec '00

Matthew Wilbert writes: > I am getting an access error I don't understand at all, > .... > <dtml-in "ZopeFind(this())"> > <dtml-var sequence-item> > .... > Zope Error > Zope has encountered an error while publishing this resource. > Unauthorized< > > You are not authorized to access title_or_id. What Zope version do you use. You need at least Zope 2.2.2 as there was a bug in earlier Zope versions. This bug may present itself exactly as you described. Dieter

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Re: [Zope] dtml methods and properties
by Dieter Maurer 04 Dec '00

04 Dec '00

Willem Broekema writes: > As a DTML method is said to work with the properties of the object it > is called at: > > DTML method "m": > <dtml-var bobobase_modification_time> > > <root folder of site>/m > displays the date/time when the last change happened to any file > in the root folder > > <root folder>/m/m > displays last change date/time of method m > > Why does the method not display it's modification time on the first > occasion? Or: why does it not give the folder's modification time > on the second occasion? I suggest, you read the sections about the DTML namespace in the upcoming Zope book (online on zope.org) You will learn that the namespace is a stack of bindings. When a name is looked up, the bindings on the stack are successively asked about the looked up name. The first binding that knows the name succeeds and returns the value. At a different place in the book, you learn that a DTML method (in contrast to a DTML document) does not push itself onto the DTML namespace. Thus, you look through the DTML method onto the object, the method has been called for. You will not see the DTML method's own attributes or methods. In your first example, "bobobase_modification_time" is the attribute of the object, "m" has been called for: this is "<root folder of site>". In second first example, "bobobase_modification_time" is the attribute of the object, "m" has been called for: this is "m" in "<root folder of site>". Thus, you see "m"'s "bobobase_modification_time". It is however, the first, not the second "m". Dieter

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Why Not Zope? 'Cos I like to bitch! ;-)
by Chris Withers 04 Dec '00

04 Dec '00

Karim Yaici wrote: > > Hi guys, > I found this article written by someone from Quixote concerning Zope, > describing its weaknesses and possible future development > http://www.amk.ca/python/writing/why-not-zope.html This guy is quite far up his own arse :-) It's probably more useful to work around the problems he describes rather than bitching about them and telling people not to use Zope: The 'no grep' is probably the most serious of his points. You can easily get around it though, by using a ZCatalog. Admittedly, a decent search and replace interface (which I'm plugging for on zope-dev ;-) would be really nice (Zope 3? ;-) No CVS is also a problem, but with the improvements in the History tab and the like, this less of an issue. Besides, it's again easy to work around by keeping CVS-ish stuff on the filesystem either by putting them in python products or HTMLFiles. There's even ZCVSMixing should you really be pedantic. The test suite stuff is true for any web application, as has been discussed on the XP lists (so I'm told ;-) That said, there's ZUnit and PyUnit now, so I'm not sure that his opinion on this is valid at all. His comments about DTML are all valid, but it's a choice he'd made to write logic in DTML and he's a fool for doing so. IMNSHO, all 'logic' should be kept in python and you should never need to use the "" in a DTML tag. If you do, you're doing too much in DTML. Put it in a product or one of Evan's new-fangled python methods (although these aren't CVS'able, so I'd advise against it, unless is 'python scripting') If used this way, DTML actually provides quite a nice scripting layer for people who only understand/care about HTML, and there's the promise of XHTML for the future. He sees DTML's 'dynamic scoping' as a hinderance, it's actually one of its strengths. Yes, it can be confusing, but maybe you should just write code which doesn't make assumptions about variables, or handles the cases when they're not there. The same is true of acquisition and the namespaces concepts, maybe with better documentation, people like him wouldn't have such problems. Zope's built in FTP server is one of it's huge stengths, IMO. He hasn't realised this and so bitches about it. You can always turn it off you know! Likewise the HTTP server, run Zope as a CGI if you must! :P Oh yeah, TTW editing does _not_ mean code has to live in the ODB as I've already mentioned. Of course, in being behind Quixote, this guy has an alternative motive for slagging off Zope, but I do wish he wouldn't. In (almost) his own words, he just wants a filesystem of python scripts to build his website. Fine, but that doesn't solve a lot of people's problems and has a lot of limitations, hence Zope came into being. Yes, it's a complex beast but, if handled correctly, it'll save you loads of development time and leaves you with a graceful, quick application that is seperately configurable and scriptable, and has a _lot_ of code re-use. I'm pretty sure this is true for the vast majority of web applications but, of course, there are exceptions, although I'm not sure MEMS Exchange is one of them ;-) The one problem with Zope that he _should_ have mentioned is this: You have to try pretty hard to write nasty code in Python, which si why it's so great. Conversely, it's quite easy to build 'nasty' applications in Zope that are messy and hard to maintain. Such is life, that's a possibility I'm willing to live with for the power that Zope gives me. cheers, Chris

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Why is acl_users "Contents" hidden?
by Kyler B. Laird 04 Dec '00

04 Dec '00

I've been planning on using roles to control access to folders. Unfortunately, I find that if a user doesn't have the "Manage" role, requests to acl_users/manage_workspace will get redirected to acl_users/manage_access and no "Contents" tab will be shown. The user can still go to acl_users/manage_main and manage users, but he must know how to get there. Is there a simple fix? Thanks. --kyler

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Re: [Zope] Passing lists in a get request (ZCatalog Search)
by Dieter Maurer 04 Dec '00

04 Dec '00

magnus(a)websys.no writes: > | Someone else suggested to use a post (rather than get) request. > | In general, I would warn you against this solution. > | It will break the "dtml-in" batch support. > > Could you elaborate on this? "dtml-in"'s batch support uses the CGI variable QUERY_STRING. This is only defined for GET requests. As a consequence, there is no batch support (i.e. automatically splitting long list displays over several pages) for POST requests. Dieter

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siblings of me, rather than of parent
by Randall Kern 04 Dec '00

04 Dec '00

My site has two main classes of objects, Modules (and their derivatives), and Categories. A normal setup might look something like this: root blab (Module) weather (Category) rain (Category) sun (Category) region (Category) I need to handle URLs like /root/blab/weather. The problem is that I need weather.__of__(blab) on the stack, rather than weather.__of__(root) on top. This is because blab (in some cases) overrides default behaviors from root. I thought the proper way to do this was by adding a __bobo_traverse__ method to my Module, like this: def __bobo_traverse__(self, REQUEST, name): try: parents = REQUEST['PARENTS'] parent = parents[-2] if hasattr(parent, name): ob = getattr(parent, name) if ob.meta_type == 'Category': return ob.aq_inner.__of__(self) except: pass return getattr(self, name) But that doesn't seem to change anything, although it does perform the return (and doesn't throw any exceptions.) Basically, I'm trying to offer my siblings as if they were my children, so if they fail to offer something, it will be looked for in me, rather than my parent. Thanks, -Randy

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"Simple" site - hard to make ?
by Michael Jenner 04 Dec '00

04 Dec '00

I would like to set up a site with the following contents / requirements: 1. One main-page (no header / footer). Mainly a clickable image + a few links. 2. A section with articles. Including the "Print this page" option. This section should use one set of headers and footers. Contents and formatting should be separated. Authors should be allowed to correct articles. 3. A section with news. This section should use another set of headers and footers. 4. A section with exits. All pages except the main page should have a common navigation system. (simple is fine). Is this easy to do in Zope or ?? Thanks in advance, Michael

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where (required)
by Tom Deprez 04 Dec '00

04 Dec '00

Hi, I've a sort of interpretation error : I want to use the following query 2 ways : 1. Provinding the variables. (will give me one record) 2. Without providing the variables. (will give me all records). I use the following query : select * from address <dtml-sqlgroup where> <dtml-sqltest A_CENTRENO column=ADDRESS.CENTRE_NO type=int optional> <dtml-and> <dtml-sqltest A_NAMELINE1 column=ADDRESS.NAME_LINE1 op=CONTAINING type=nb optional> <dtml-and> <dtml-sqltest A_POSTALCODE column=ADDRESS.POSTAL_CODE type=nb optional> <dtml-and> <dtml-sqltest A_CITY op=CONTAINING column=ADDRESS.CITY type=nb optional> <dtml-and> <dtml-sqltest A_STATEPROVINCE column=ADDRESS.STATE_PROVINCE type=nb optional> <dtml-and> <dtml-sqltest A_AREANO column=ADDRESS.AREA_NO type=nb optional> <dtml-and> <dtml-sqltest A_PHONENO column=ADDRESS.PHONE_NO type=nb optional> Although the where clause is optional, even the parameters are optional, if I just call the method without parameters, I get the following error. Is this normal? Why then is there a parameter 'required' with the Where-tag? Error Type: Bad Request Error Value: ['A_CENTRENO', 'A_NAMELINE1', 'A_POSTALCODE', 'A_CITY', 'A_STATEPROVINCE', 'A_AREANO', 'A_PHONENO'] Thanks, Tom.

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How to build a c extension on a linux system
by r.seiffert＠herrenausstatter.de 04 Dec '00

04 Dec '00

i would like to install a zope product that includes a c extension (DynPersist.c) with a Setup file like this: *shared* DynPersist DynPersist.c -I../../ZODB -I../../../Components/ExtensionClass has anybody an idea, how to start the compilation ? thx Ruediger ~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.herrenausstatter.de - Der Online-Herrenausstatter Kostenlose Serviceline: 0800 -999 66 33 Versandkostenfreie Lieferung - 30 Tage R�ckgaberecht ~~~~~~~~~~~~~~~~~~~~~~~~~ Verwaltungsadresse: DePauli.com Aktiengesellschaft Stahlgruberring 3 - 81829 M�nchen Telefon: 089 / 530 75 170 - Telefax 089 / 514 50 666

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