November 1999 - Zope-Dev

ANN: TableView 0.01 available
by Andrew Wilcox 23 Nov '99

23 Nov '99

This is an initial development release of code in progress. Hackers and other help welcome! Release 0.01 is up on the Zope site at http://www.zope.org/Members/AndrewWilcox/TableView/ A TableView displays a folder of objects as an HTML table. Each object in the folder is displayed as a row in the table, and the columns show property values from the objects. You can also use a ZClass that subclasses from ObjectManager. So if you have a CD_Collection class that contains CD objects, the TableView will display your collection of CD's. Goals of the project: * Create a general-purpose Zope interface for editing data in a tabular format. * Let users easily arrange a list of items in a particular order. * Allow web site designers to display information in an HTML table with needing to know the ins and outs of HTML coding with the <table> tag, and programming with <dtml-in> tag. This is my first attempt at creating a Zope product distribution, so feedback on packaging, installation problems, etc. would be great. Feedback on the design approach from experienced Zope hackers would be terrific as well. The product creates an object that displays a view of another object, similar to the model-view paradigm you see in Java or Smalltalk programming. Right now the displayer and the displayee get linked through acquisition, but that might not be the best way to do it. Thanks all, Andrew

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ZCatalog search problem with some extended chars
by Alexandre Ratti 23 Nov '99

23 Nov '99

Hello, I tested the ZCatalog search feature on text with French extended characters. I use Zope 2.1b2 on Win NT 4. I set the 'fr' locale in z2.py. Zope restarted OK. The results are strange: when words with extended characters are indexed in Text Fields, some can be found and some can't. (No problems in Keyword Fields). I think I narrowed it down to the following: some extended characters are OK and some are not. I enclosed below a list of 'searchable' and 'non-searchable' characters. I suppose there is a pattern but I couldn't see it. Did anyone witness similar behavior? Can I do something to fix it? Cheers. Alexandre --------------- (When testing I included the actual character, not its entity representation. However, I include the entities here for reference because mailers may not display these characters properly). Included information : HTML entity name - Octal code - ANSI code Are not working on my box --------------------------------------- À - Octal \300 - ANSI 192 Â - Octal \302 - ANSI 194 Ä - Octal \304 - ANSI 196 Ö - Octal \326 - ANSI 214 à - Octal \340 - ANSI 224 â - Octal \342 - ANSI 226 ä - Octal \344 - ANSI 228 ç - Octal \347 - ANSI 231 è - Octal \350 - ANSI 232 ö - Octal \366 - ANSI 246 ù - Octal \371 - ANSI 249 Are working on my box ---------------------------------- É - Octal \311 - ANSI 201 Ê - Octal \312 - ANSI 202 Î - Octal \316 - ANSI 206 Ï - Octal \317 - ANSI 207 Ô - Octal \324 - ANSI 212 Û - Octal \333 - ANSI 219 Ü - Octal \334 - ANSI 220 é - Octal \351 - ANSI 233 ê - Octal \352 - ANSI 234 î - Octal \356 - ANSI 238 ï - Octal \357 - ANSI 239 ñ - Octal \361 - ANSI 241 ô - Octal \364 - ANSI 244 û - Octal \373 - ANSI 251 ü - Octal \374 - ANSI 252

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Questions about ZCatalogs
by Alexandre Ratti 23 Nov '99

23 Nov '99

Hello, I read in the zope lists archives that ZCatalogs support: - the 'andnot' operator; - a near operator ("..."); - phrasing. Is this acurate? I cannot find how to use any of this in Zope 2.1b2 on Win NT4. 1) The andnot operator If it is available, could you provide a syntax example? This works: <dtml-in "searchResults({'title':'site and zope'})"> This works too: <dtml-in "searchResults({'title':'site or zope'})"> This doesn't return any answer: <dtml-in "searchResults({'title':'site andnot zope'})"> This doesn't either: <dtml-in "searchResults({'title':'site and not zope'})"> 2) Near operator Can you provide an example? How near is 'near'? 3) Phrasing search Does ZCatalogs support searching for an exact phrase, eg. "blue cars"? If supported, this would return only docs where the phrase occurs, not the individual words. I'm really interested in this feature. Could you provide a DTML syntax example? I found the following example (not disrespect intended MartijnF ;-) in an email but I get a Document Template Parse Error when I run it: <dtml-in "searchResults({'body_text': '"Martijn Pieters" and not "Martijn Faassen"'})">...</dtml-in> Many thanks. Alexandre

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RE: [Zope] How do I make an external object persistent?
by Michel Pelletier 23 Nov '99

23 Nov '99

Moved to zope-dev > -----Original Message----- > From: Andres Corrada [mailto:andres@corrada.com] > Sent: Tuesday, November 23, 1999 11:56 AM > To: zope(a)zope.org > Subject: [Zope] How do I make an external object persistent? > > > Hi, > I'm new to Zope. I have classes that I want to use in > Zope without > making them Products. How can I inject the Zope namespace > with an object > so it remains persistent? For example, a Form object that renders and > validates a form. For an object to exist persistently in zope, its class must subclass Persistence.Persistent. You can, however, utilize other classes in external methods. Note that the *instances* of these classes will not persist across external method calls. -Michel

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Re: [Zope-dev] New beta GenericUserFolder
by Stuart 'Zen' Bishop 23 Nov '99

23 Nov '99

On Mon, 22 Nov 1999, Ross Boylan wrote: > I notice that a lot of products redefine class variables (e.g., > GenericUserFolder has > isPrincipiaFolderish=1 > isAUserFolder=1 > ) which are already in the superclass. Is this because: > * it's more readable Because it is more readable, and ensures that nothing wierd goes on with multiple inheritance. For example, in GenericUserFolder, I inherit from both Folder and BasicUserFolder. Now, since only BasicUserFolder defined isAUserFolder, then I could have left it out and things would work happily. However, if in a future revision, someone moved isAUserFolder to SimpleItem or other subclass of Folder and defined it as false, my product would break. I used to like multiple inheritance until I saw a real product using it (Zope), and now I appreciate Java more :-) > 1) Let new users define themselves on a new user screen (not a Zope > management console). > I've been hung up on the architectural points of where such a screen should > go, how it is to refer to the acl_users folder, and how to set permissions. You need a form, accessible to the Anonymous role, that will let a user setup an account. You also need a DTML method to act as the action of this form. This DTML method would insert the releveant data into a TinyTable,SQL table, whatever. It would probably need a proxy role defined so that the method has rights to add the data (since the anonymous user shouldn't have rights). You could then use GenericUserFolder to authenticate users from this TinyTable,SQL table,whatever. [root] +- createAccount_form (DTML Method) +- createAccount_submit (DTML Method) +- secured +- acl_users (GenericUserFolder) +- UserTable (TinyTable) +- userAuthenticate +- [ other GUF hooks] createAccount_submit would be given a proxy role of Manager, and would insert a row into UserTable with all the relevant information (username, sha.new(password).digest(), possibly roles). userAuthenticate would generate sha.new(password).digest() and compare this to the stored SHA password hash in UserTable. the other GUF hooks could calculate their return values, suck them out of UserTable or just return fixed strings depending on your environment. > 2) Have User objects which are subclasses of user, for extra data and > functionality. > I've been trying to avoid modifying the code in AccessControl/ directly, > since that's cheating (and not robust against Zope system changes). > > I think if you took the class as a variable, or took a factory object as an > optional argument to your stuff, it would meet 2) without much trouble. Its on my todo list, but it won't be there until I get the basics released. Similar functionality can be done right now. For example, I have a DTML method userEmail high up in my tree which takes a username and returns that users email address. It just means I have to do userEmail(this(),REQUEST,username=AUTHENTICATED_USER.getUserName()) instead of AUTHENTICATED_USER.getEmail(). Note that your pluggable brain would have to be a subclass of GenericUserFolder.User, and not AccessControl.BasicUser. The method described in the previous paragraph could also work for users authenticated through other mechanisms besides GenericUserFolder provided by DTML code was intelligent enough. -- ___ // Zen (alias Stuart Bishop) Work: zen(a)cs.rmit.edu.au // E N Senior Systems Alchemist Play: zen(a)shangri-la.dropbear.id.au //__ Computer Science, RMIT WWW: http://www.cs.rmit.edu.au/~zen

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New beta GenericUserFolder
by Stuart 'Zen' Bishop 23 Nov '99

23 Nov '99

I've uploaded a new beta of GUF , which I've fixed the outstanding authentication issues. This has (hopefully temporary) introduced a new limitation where things will stuff up if you create a GUF (using cookie authentication) inside an area already protected with cookie authentcation. I'm fairly certain this problem is also in most other acl_users inplementations that use cookie authentication methods. Now for something wierd: I have a Zope installation that looks like the following: [Root] +- acl_users (UserFolder) +- CS +- acl_users (GenericUserFolder) +- Zen (Protected - just user 'zen' has permissions to it) +- index_html Now - its all working just fine in most situations. Now, I can happily access the URL http://myserver:8080/CS/Zen - login screen pops up, I enter username & password, and I get my index_html page. I can then also go to http://myserver:8080/CS/Zen/manage and see the management screen just dandy. In this case, the manage method populates the left and right frames with the following URL's: http://myserver:8080/CS/Zen/manage_menu http://myserver:8080/CS/Zen/manage_workspace The title is: <TITLE>Zen on http://wombat:8080/Test2/CS/Zen</TITLE> However, If I fire up the browser and go directly to http://myserver:8080/CS/Zen/manage, things start screwing up. I get the authentication screen, enter username & password, ok, and then the manage panes pop up but authentication to these protected resources never happens. The manage method is populating the left and right frames with the following URL's: http://myserver:8080/manage_menu http://myserver:8080/manage_workspace The title is: <TITLE>Zen on http://myserver:8080</TITLE> If you click 'cancel' on the BasicUser authentication dialog box that has popped up, you will end up with unauthentated tracebacks in both panes. However, sharp eyes will notice that the 'back' button is now available on your brower, which is strange since this is the first page we have visited. Clicking 'Back' brings you to a fully functional, correctly authentication management screen. Wierd - something must be sending a dodgy redirect. Which is odd, since it isn't my code as far as I'm aware. I'm at a loss to why this would be happening. Why should the manage method return differently depending on if the browser has previously visited a protected page or not? I can duplicate this on both 2.0.1 and 2.1beta2. I can't duplicate in an area not protected by a GUF, so I assume it is something wrong in my code. Since I don't actually *have* manage, manage_main or manage_menu functions (I'm inheriting from Folder), I'll further assume it is something I've left out that shouldn't have been. Any hints? My forehead hurts. -- ___ // Zen (alias Stuart Bishop) Work: zen(a)cs.rmit.edu.au // E N Senior Systems Alchemist Play: zen(a)shangri-la.dropbear.id.au //__ Computer Science, RMIT WWW: http://www.cs.rmit.edu.au/~zen

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RE: [Zope-dev] PCGI bug (Was: Zope-2.1.0b2 fails on access to ma nagement screen)
by Brian Lloyd 23 Nov '99

23 Nov '99

> Hmm.. And this means, what I can make out, that you now have > a AF_UNIX type > socket and address, and that address is a string, but the > code expects a > AF_INET type socket and address, whose address is a (host, port) pair. > > Which leaves us with the question, how did you end up with a > AF_UNIX type > socket instead of a AF_INET type? And why doesn't the code in > PCGIServer.py > account for the possibility? Hmm - it looks like the logging code in PCGI server was just broken - it didn't account for the fact that self.addr could be other than a (host, port) tuple. I've checked in a change for 2.1.0 that adds a check to make sure the addr is really a tuple and will cause it to fall through to the safe default otherwise. Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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cvsweb.cgi back
by klm 23 Nov '99

23 Nov '99

One of the victims of the site transition, the web-based browsing of the public CVS checkin, has been resuscitated. A number of people have asked about it - i'm sorry i hadn't realized how useful it is to people, or i would have placed more priority on getting it back sooner! Ken klm(a)digicool.com

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ZopeZen listing on zwiki
by Anthony Pfrunder 23 Nov '99

23 Nov '99

Hi, Due to the recent unveiling of Zope Zen on the zope-dev list I've collected the gems into zwiki so that they will be available for others. The address is: http://209.67.167.82/zwiki/ZopeZen. If it is ok, I'll cross-post to zope(a)zope.org after feedback. Cheers, Anthony Pfrunder

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Missing and cmp
by kent＠tiamat.goathill.org 22 Nov '99

22 Nov '99

The module Missing has interesting cmp behavior: >>> import Missing >>> b=[5,Missing.Value,0,-3,'c',Missing.Value,0,4,'a',Missing.Value, 'b',Missing.Value,6] >>> b.sort() >>> b [-3, 5, Missing.Value, 0, Missing.Value, 0, 4, Missing.Value, \ Missing.Value, 6, 'a', 'b', 'c'] As you can see, inserting a Missing.Value in the midst of a list, (particularly when juxtaposed with a zero) causes problems with numeric compares. Question: How should Missing.Values be sorted? Regardless of what their 'value' should be, I don't think they should disturb how other values are sorted. I'd recommend that they evaluate to less than all other values... Comments?

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