February 2000 - Zope

Scalability
by Lucas Vogel 23 Feb '00

23 Feb '00

Where can I read the documentation on zope's scalability? I really love Zope, and I want to see how far it can go... (sorry for being vague, I've spent all night planning a website to use zope for) ------------------------------------------- Lucas Vogel, Software Developer Exponent Failure Analysis Associates, Inc. lvogel(a)exponent.com (623)587-6739

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Accessing Subobjects of a ZClass Instance
by Nico Grubert 23 Feb '00

23 Feb '00

I created a ZClass containing -Base Classes both "Object Manager" and "Catalog Aware" -Subobjects both "Image" and "File". In a DTML-Methode all properties of an instance are shown by: <dtml-in "PARENTS[0].objectValues(['MyProduct'])"> <tr> <td><dtml-var myObjNr></td> <td><dtml-var myObjTitle></td> .... "myObjNr" is the id of each object. Some Objects contain a file or an image or both a file and an image. I upload two images "beach.gif" and "water.gif" to the instance e.g. "MyObj01". the tag <img src="<dtml-var myObjNr>/beach.gif"> this works fine and shows me the image "beach.gif". What I need to do that I can see all images or even better the whole content an instance contains ? Something like ???? syntax: <img src="<dtml-var myObjNr>/___content of an instance______"> thanks in advance nico

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ZSQL Method Question
by Chris Withers 23 Feb '00

23 Feb '00

Hi, Does anyone know how I can find out the number of rows returned by a select statement in a Z SQL method? basically, I've got a form which has one row for each row in the database, I need to put a hidden count input in so the DTML method which processes the form knows how many rows to expect. Cheers for any help, Chris

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Re: [Zope] structured text with <dtml> tags?
by Tres Seaver 23 Feb '00

23 Feb '00

"R. David Murray" <bitz(a)bitdance.com> wrote: > > On Tue, 22 Feb 2000, Alex Burton wrote: > > I'm still discovering Zope and I'm having fun with structured text. > > I'm wondering if there's a way to evaluate <dtml> tags in the > > structured text before (or after) rendering the structured text to > > HTML. > > Since StructuredText's main purpose (I think) is to be reasonably > formatted for reading as straight ASCII while containing enough > structure to allow better rendering, I'm not sure why you'd want > to interpret dtml tags inside it. In fact, I'd like the opposite: > a way to supress the interpretation of *html* inside structure text > (or, rather, to have the structured text output quote the html as > appropriate to get it to render rather than interpret), thus allowing > structured text fields to be used as a safe data entry format for > a portal-type site. I'm guessing that there's a function I can > call to do this encoding before passing the thing to the structured > text interpreter, but I'm not sure what the magic incantation is. > Can someone enlighten me? There is a function, html_quote(), defined both in the StructuredText module and in DocumentTemplate/DT_Util.py, which escapes, the '<>&"' characters. I think you would need to apply this on the inbound side (as you were saving the STX) to make it effective. A PythonMethod to do this looks like: return special_formats[ 'html-quote' ]( untrusted_txt ) -- ========================================================= Tres Seaver tseaver(a)palladion.com 713-523-6582 Palladion Software http://www.palladion.com

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For loops in dtml
by Chris Withers 23 Feb '00

23 Feb '00

Anyone know how I can do the equivalent of the following in dtml: for (int i=0; i<count; i++) { ...stuff... } or even int i=0; while (i<count) { ..stuff.. i++; } cheers, Chris

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Creating a "list of strings" from DTML-Method?
by Soren Roug 23 Feb '00

23 Feb '00

I'm working on a product where I want to create a property that is a selection and allows you to select between a list of folders created in the parent folder. When you add a property in the property sheet the text directly above says: | |For "selection" and "multiple selection" properties enter the name of |a selection variable |in the "Value" field. The selection variable is |a property or method that returns a list of strings from which the |selection(s) can be chosen. | After fiddling around a bit I realized that the only methods that qualify are Z SQL methods. That's not what I'm looking for. Does anybody know how to do this with a DTML method or has anyone subclassed the DTML method to a class that returns a list of strings instead of rendering the text? Soren Roug European Environment Agency

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Re: [Zope] Using apache w/ZServer question
by rgines＠purina.com 23 Feb '00

23 Feb '00

<snip> >and am having some problems. In the document it says to put the >ProxyPass directives within the main Directory context. I assume that >he's referring to the DocumentRoot; yet whenever I put the Proxy* >directives anywhere I get an error when I try to restart apache, saying >that they can't be in there. So I take them out and leave them by >themselves. Apache restarts, but when I try to go to the path I get a >'Document contains no data' message. Here's what I am doing on a testing server which might help you. The apache server is on port 80 at gynzer.yyy.xxx.com (Internal Intranet ... ) Zope is running at gynzer.xxx.yyy.com:8080 Virtual host is at an address with a DNS entry of rlgtest1.yyy.xxx.com I want rlgtest1 to actually point to the /PPEGroup/MES directory in Zope Here is my Apache Entry <VirtualHost 170.73.133.190> ServerAdmin rgines(a)xxx.com ServerName rlgtest1.xxx.yyy.com ProxyPass / http://gynzer.xxx.yyy.com:8080/PPEGroup/MES/ ProxyPassReverse / http://gynzer.xxx.yyy.com:8080/PPEGroup/MES/ ProxyPass /misc_ http://gynzer.xxx.yyy.com:8080/misc_ ProxyPass /p_ http://gynzer.xxx.yyy.com:8080/p_ </VirtualHost> Note: the last two lines are necessary to keep the graphics and misc internal links working properly. So that /PPEGroup/MES really does look like the root of server rlgtest1, I am using SiteAccess to fake it out ... the jury is still out as to using this or not. It has good points and bad points to using it. Depending on my mood for the day I seem to sway back and forth between using it or not. I hope that this helps.

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Re: Zope digest, Vol 1 #643 - 53 msgs
by Tres Seaver 23 Feb '00

23 Feb '00

auto44082(a)hushmail.com > Date: Tue, 22 Feb 2000 16:08:29 -0800 (PST) > Subject: [Zope] id problems in product I'm creating > To: zope(a)zope.org > > I'm trying to create a product which is a derivative of the DTML document. > Things seem to work OK, I go into the product management screen, add my > product, then add a zclass to my products which inherits the DTML document > class. So far so good. Then I go in and add my custom ICON, and go to the > root folder to try it out. > > The problem is that when I add a new instance of my product, I am prompted > for an ID, and the product is added, but Nothing in this new product which > access or uses the id variable works. When you click on the new DTML derived > object, you do indeed get the edit screen (looks just like the one for a > DTML doc), but the id field at the top is blank. Furthermore, when you browse > to this new object. The standard view containing a standard header,footer > and a sentence stating the ID of the document is wrong. The ID is blank. > the DTML tag , <dtml-var id> yeilds nothing. > > But I can't find anything wrong in my product's add form method, or the > add constructor method. > > Any Ideas? Thanks for any help as I'm farely new to this whole Zope thing. This is a known problem -- see the HowTo for a workaround: http://www.zope.org/Members/AlexR/ZClassIDBug -- ========================================================= Tres Seaver tseaver(a)palladion.com 713-523-6582 Palladion Software http://www.palladion.com

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Re: [Zope] User/Subscriber advice on How-To
by Tres Seaver 23 Feb '00

23 Feb '00

Jon Prettyman <jprettyman(a)acm.org> wrote: > > I'm trying to set up a registered subscription based site with Zope. > The powers that be want a cookie based authentication scheme, so I've > started by using GenericUserFolder to handle my authentication. I'm > keeping my user account info in a /etc/passwd type file. I have some > ExternalMethods I use to create user accounts that are accesible from > a ``register'' method in my acl_users folder. So far so good. > > The PTB want to add more account information such as e-mail address, > phone/fax etc. I'm wondering if my best course of action at this > point would be to add this info to my account file in the form of > additional fields, or should I create some type of User class derived > from BasicUser to handle this. If I go the class route, I'm a little > confused about what to derive where. Does anybody have any > suggestions on what my best course of action would be? Depending on your (John's) time frame, the Portal Toolkit (http://www.zope.org/Products/PTK) is aimed directly at your problem. It will have a framework in place for extensible User objects, with your choice of storage formats (local password file, RDBMS, the ZODB, LDAP, etc). In particular, you will be able to associate additional data with each user. The PTK already looks good, and is progressing nicely. The "extensible user" features should be available very shortly. John Morton <jwm(a)plain.co.nz> replied: > > Jon Prettyman writes: > > I'm trying to set up a registered subscription based site with Zope. > > The powers that be want a cookie based authentication scheme, so I've > > started by using GenericUserFolder to handle my authentication. I'm > > keeping my user account info in a /etc/passwd type file. I have some > > ExternalMethods I use to create user accounts that are accesible from > > a ``register'' method in my acl_users folder. So far so good. > > > > The PTB want to add more account information such as e-mail address, > > phone/fax etc. I'm wondering if my best course of action at this > > point would be to add this info to my account file in the form of > > additional fields, or should I create some type of User class derived > > from BasicUser to handle this. If I go the class route, I'm a little > > confused about what to derive where. Does anybody have any > > suggestions on what my best course of action would be? > > I'm going for a SQL backed approach myself (with postgreSQL), but > that's only a good option if you're reasonably well versed with DB > admining and SQL hacking. For your approach, it's probably best to > have the passwd file just handle the user/password and roles aspects, > and make a ZClass to handle the extra user information. Set the > property sheet up with all the user information, and build some nice > forms to handle adding and editing. Then the rest is a matter of > security settings - the user who's information it is should have a > local role of owner set so they can always veiw and edit their > information. Anonymous users probably shouldn't be able to view other > people's information, but some other roles might. And remember to make > Zcatalog a base class when you build the Zclass so all the user > information is searchable. Note that I think the base class you want here is "CatalogAware", not ZCatalog. -- ========================================================= Tres Seaver tseaver(a)palladion.com 713-523-6582 Palladion Software http://www.palladion.com

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stupid, but neccessary q'n
by Tom Deprez 23 Feb '00

23 Feb '00

When Adding properties to a ZClass, I came across the type Token. What does this mean? TIA, Tom.

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