September 2004 - Zope

update existing instances of a class?
by John Schinnerer 22 Sep '04

22 Sep '04

Aloha, I have a python product that I have modified (most importantly by adding some properties). Some instances already exist that were created prior to adding these properties. I have heard it is possible to update the existing instances (so that they get the new properties) - is this true? If so, where might I find info on how to do this? thanks, John S. __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail

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Can't locate PyObject_SetItem
by Jonathan Hobbs 22 Sep '04

22 Sep '04

I am trying to track down the cause of a performance problem in ZCTextIndex (OkapiIndex is the leading contender - thanks to Dieter to for the tip!) and have gotten as far as the 'score' routine in okascore.c - which references a routine called 'PyObject_SetItem', for which I cannot locate the source routine. Does anyone know where the source for the 'PyObject_xxx' routines are stored (linux installation)? Thanks in advance, Jonathan

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RE: [Zope] Re: DBTAB mounting ZCLASS as container
by Arenz, Ralph 22 Sep '04

22 Sep '04

-----Ursprüngliche Nachricht----- Von: Dieter Maurer [mailto:dieter@handshake.de] Gesendet: Mittwoch, 15. September 2004 21:22 An: Arenz, Ralph Cc: 'zope(a)zope.org' Betreff: Re: [Zope] Re: DBTAB mounting ZCLASS as container Arenz, Ralph wrote at 2004-9-15 17:33 +0200: > ... [DM] >>This will not be possible without major work: > >> You would need to implement a new type of mount point. >> Its class key would allow a ZClass reference. >> The corresponding datatype would be a factory that >> later instantiates the ZClass. > ... [RA] >can you be a little more concrete. I spent a look over the sources from >dbtab and found some fragments which gives a hint that dbtab can work with >ZKlasses, but i >can't figure out how do arrange this. Do i really have to implement a new >mount point although i >need a ZClass as a container for it? >[DM] >I do not know but I fear it. > The current schema uses a "python_dotted_path" to specify > the "container-class". > I may be wrong, but I doubt that you can access a ZClass > via a "python_dotted_path". > If I am right, you would need to change at least > the datatype for your "ZClass" container-class. >You might get away with just changing the datatype. >It is your problem. You must investigate further... >-- >Dieter The only thing to do is defining the container_class entry in dbtab.conf as follow: container_class=*[class_id_of_desired_zclass].id_of_zclass e.g. container_class=*LHUIGUGZ436536==.MyZClassId

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Get mime type and filename without path in python
by Patrick Ulmer 22 Sep '04

22 Sep '04

Hi, I want to allow uploading files from my website and put it in a database. My short script works: if myfile and myfile.filename != '': container.dbUpdateFile (id=str (id_ds), myfile=myfile.read ()) Now I want to put the mimetype in the database put how can I get the mimetype? I try: import mimetypes guess_type(myfile.filename) but I got an the error "*You are not authorized to access this resource".* What's wrong? I also want to put the filename in my database, but the Internet Explorer gives me the filename with path. Is there a funtionc to get the filename without path? Thanks, Patrick

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Re: [Zope] Calling SQL from Python products
by Johan Carlsson 22 Sep '04

22 Sep '04

I'm "bounching" this thread back to the list :-) Dario Lopez-Kästen wrote: > Johan Carlsson wrote: >> >> I guess if your using ZSQL it's just easier to create ZSQLMethod >> object in the class? >> >> I just realized that I want ZSQL, to do escaping for instance... >> Passing string doesn't feel secure if there's ttw data in it. >> > > I think that there are some advantages of your solution that perhaps can > be of use - and I think it would be interesting with some testing too. > > Yes, you can create the ZSQL from inside the product (look at how > ExUserFodler does that for instance), and if you use FSbased ZSQL > methods it is even easier. One problem that I find with ZSQL Methods is that I need to delete the connection_id attribute from the ZSQLMethods I create at class level: class MyClass(BaseClass): connection_id="MyConnectionID" _zsql_meth=ZSQLMethod('','','', arguments, template) del _zsql_meth.connection_id #Now connection_id will be acquiried from MyClass #Well I noticed that I could override connection_id #by using a connection_hook def getConnectionId(self): return self.connection_id _zsql_meth=ZSQLMethod('','','', arguments, template) _zsql_meth.connection_hook ="getConnectionId" #Now connection_id will be looked up by calling getConnectionId #on MyClass. Quite similare solutions really. > You want to have ZSQL-merthods for the SQL-escaping, but also for the > dynamism it gives you. THe trick would be to render the ZSQL to a string > and then pass it on to your methods. > > If you are lookin for speed in processing the results, (apologies if you > know this allready) then perhaps there is an easier way. i.e. in a > Script(Python) (can be used in Product code as well, this is just to > illustrate): > > my_data_set = context.my_sql(param1='apa', ...).dictionaries() > > my_data_set will be a list of dictionaries, and most of the values in > the dictionary will be standard Python types - standard python types are > not checked for security, which makes traversing my_data_set a really > fast operation. > > If you use the > > for a in my_data_set: > print a.col_1 > > or > > <dtml-in my_data_set> > <dtml-var col_1> > </dtml-in> > > patterns then col_1 will be a Zope object and as such must be checked by > security. In the worst case this will give you rows*cols security checks > just to display the result-set! > > Was this the kind of speedup you where interested in? I hadn't thought about speed, so thanks for the tips :-) I'm using the Result object directly in Python as you describe, but mostly because I don't want to display tre result. I'm building a PluggableAuthenticationPlugin you see :-) The speed-up was a nice plus :-) Cheers, Johan -- Johan Carlsson Tel: + 46 8 31 24 94 Colliberty Mob: + 46 70 558 25 24 Torsgatan 72 Email: johanc(a)easypublisher.com SE-113 37 STOCKHOLM

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Invitation To Brag, Boast, or Simply State Solutions with Zope
by Jonathan Cyr 22 Sep '04

22 Sep '04

Hello Everyone, As I finish my first project with Zope, I've benefited greatly from the folks on this discussion list... their Zope knowledge much greater than my own. As I leverage Zope's features to solve my application problems, I wonder what all of you folks have been building with Zope, knowing the resource this list is. As everyone attacks the various technical problems or questions of the moment, I think the nature of this list's problem-solving nature doesn't showcase Zope and its successes very well. I would like to propose the bragging, boasting, and/or summary of your Zope solutions. I believe it will help the community, those looking at Zope for the first time, and each other. My impression is... that as Zope succeeds as a platform... we all justify our time investment... and hearing about Zope solutions in a constantly evolving software development market could be very powerful. Success stories about your solutions with Zope, posts could simply be titled "Success Story: Project Title". Details such as... - Who uses them? How many users? - How important are the solutions to users? - How did you leverage Zope to get there? - What components or add-ons helped the most? - What industry do you support? Were they resistant to Zope? Has Zope penetrated conservative IT shops? - Who uses DTML, ZPT, ZEO, CMF, ZClasses, UserFolder X, Pound, etc, and how did it help? - Does your app churn numbers, transactions, views, etc... got some stats for us? - Including various levels of expertise... folks who author products, to those who apply them to specific needs. Best of all, letting your ego "out to play", once in a while, is a good thing... It is important that, if you let your ego out, you have an effective plan to capture it safely and return it to its work.... hehe If you think this idea has value, I'd love to know... I'm really tired of PHP, J2EE, .Net, or LAMP success stories in all these magazines. Not sure how this will fly, Jonathan Cyr cyrj(a)cyr.info http://www.WeddingWeblog.com ps- I will prepare a brag-session of my product as well... if deemed a good idea

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Epoz from within ZMI only
by mark hellewell 21 Sep '04

21 Sep '04

Hello, I've only been using Zope for a few weeks, so I eventually hope to look back on my following questions with an affection usually reserved for patient owners of their slow-to-learn dogs. I need to provide content editors with some means of editing HTML-containing File objects from within the ZMI, but using Epoz. So from the management interface I would like to see an additional tab for the File object that, when clicked, shows the contents of the File object within the Epoz editing interface. Am I right in my hunch that I'd have to create some kind of Object that extends File in some way? Am I even on the right path? I really don't know how to start tackling this. I'm developing the website in straight Zope/ZPT/Python. I started down the Plone path with this but eventually decided that the design of the site didn't lend itself well to what I see as Plone's strengths. It seemed like overkill. If anyone could outline how something like this should work and point me in the right direction your assistance would be gratefully received! Thanks for your help, mark

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Epoz locking up in Firefox 1.0rc (and others)
by Richard Jones 21 Sep '04

21 Sep '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Has anyone else seen an Epoz field stop accepting user input? Clicking the checkbox to switch to "source" view and back again fixes the field so it accepts input again - but this fix is hard to describe to my generally non-computer-savvy users :) Richard -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFBUKHKrGisBEHG6TARAhuaAJ4/c4N/TUsKLnc9/EJu1M8aZO8OgACfTJjr oRrIl81WLEiwNpGSWMONs30= =Z2Yf -----END PGP SIGNATURE-----

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new 2.7 redhat rpm and external method permissions
by Ed Colmar 21 Sep '04

21 Sep '04

Greetings! I recently installed a new zope 2.7 rpm on redhat. Everything went smooth and zope is running great. I have some external methods that do various tasks throughout the filesystem. In this case, the files are in a particular mysql directory. I have created a group for zope and mysql called "www" and changed ownership of this directory to that group. I can read and write to this directory as the zope user. My external methods fail with invalid permissions. I have verified that the setuid is zope, but I am not positive that zope is actually running under the zope user. How can I set/verify that this is the case? On all of my previous zope installs, I would log in as zope, and do ./start it appears that this convention has changed. Any clues? Thanks in advance! -ed -- EMAIL ed(a)greengraphics.net VOICE 510.923.0000 FAX 510.923.0001 AIM esc3d

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Let Zope chec a internal / external link
by Martin Koekenberg 21 Sep '04

21 Sep '04

Hello, Is is possible tolet Zope check if a link is correct. Example: I've a Photoalbum an news items. These are connected with a link. But whem i move a news item to a archive, the link becomes broken. How can I prevent this error ? Is it also possible to check external links ? 'If a link doesn't exist anymore there stilis a broken link on the website. Question Can I preven zop displaying broken links ? I know this feature from tridion CMS (my seccond love ;-) Thanks for the help. Martin Koekenberg.

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