July 1999 - Zope-Dev

RE: [Zope-dev] ZClass inheriting from Python Class
by Michel Pelletier 22 Jul '99

22 Jul '99

> -----Original Message----- > From: Miller, John M. [mailto:jmiller1@uop.com] > Sent: Thursday, July 22, 1999 8:48 AM > To: 'M.Faassen(a)vet.uu.nl'; zope-dev(a)zope.org > Subject: RE: [Zope-dev] ZClass inheriting from Python Class > > > Heya, > > If I've read and interpreted the Documentation properly, you > need to make > your Python class a subclass of BoboPOS.Persistent. Then I Actually, Persistence.Persistent. BoboPOS will work but it's not 'the way'. It's legacy. > think you need > to do something like get_transaction().commit() when you want > to commit > changes you've made. Though it may be that Zope takes care You don't really ever need to do this if you treat all attributes immutibly. > of transactions > most of the time and you don't have to worry about this. I also just > discovered a 27 page document on ZODB 3 (cool! the more stuff > to read, the > better I say) which definitely will have a more definitive > answer than my > casual hack. >

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RE: [Zope-dev] ZClass inheriting from Python Class
by Michel Pelletier 22 Jul '99

22 Jul '99

> -----Original Message----- > From: Martijn Faassen [mailto:faassen@vet.uu.nl] > Sent: Thursday, July 22, 1999 9:42 AM > To: zope-dev(a)zope.org > Subject: Re: [Zope-dev] ZClass inheriting from Python Class > > > Yes, but in the case of ZClasses I was assuming that my Python mixin > class would be automagically mixed in with the ZClass, which already > does all this persistent stuff, right? So that's why I'm puzzled, but > maybe you're right. In that case I want to know why still. :) I'm > probably just confused about this, but the ZClasses tutorial also > doesn't mention having to do more than registering the Python > class with > Zope to make it work. > You do need your subclass to subclass Persistent. -Michel

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RE: [Zope-dev] Questions for ZOPE gods: Acquisition, etc.
by Brian Lloyd 22 Jul '99

22 Jul '99

> I've been poking around in the 2.0.0a4 sources to allow > subsiting (Folder > in existing Zope + Domainname == Subsite ;) ), and I've developed some > questions, that probably not many people will be able to answer: > > -) Is there anywhere documentation about Acquisition? How > exactly is it > intended to be used, etc. I've been reading the source > code, so I think > I'm breaking the Acquisition chain the right way at the > subsite level, > but thinking and knowing are different words. ;) Check out: http://www.zope.org/Documentation/Reference/Acquisition > -) I've actually done the ZPublisher subsite patch twice, and in both > cases (dirty and the newer almost clean version), I get permission > denied problems for my subsite folder. Now, after looking at the > Application object and the Subfolder object, I'm getting > the impression > that a Folder cannot be the toplevel folder of a Zope > database, right? > > Andreas Right - the top level object is actually an "Application" object, which is mostly like a Folder but contains some other necessary things. That is probably also the root of your authentication problems - note also that intentionally breaking the acquisition chain will also likely break security, which is pretty intimately tied to Acquisition. Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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RE: [Zope-dev] creating one ZClass instance in the constructor of another
by Brian Lloyd 22 Jul '99

22 Jul '99

> Hi Zopistas - > > This is probably a really easy one, but I was wondering if > anyone knows > how to create an instance of one ZClass inside the constructor of a > different ZClass. To illustrate with an example: > > I have defined two ZClasses, a ProjectManager and a GuestBook (I > reimplemented the old Guestbook example product using ZClasses) as > separate Products (since they are not really intrinsically related). > I want to use the GuestBook in the ProjectManager, but I can't figure > out how to create the GuestBook in the ProjectManager's constructor. > > I want to do something like > >  > > in the ProjectManager_add method; however, since the other Product's > names don't seem to be defined in the namespace of ProjectManager_add, > this doesn't work. > > Can anyone please tell me the magical solution to this problem? > > > --Brian Hooper This is a little ugly, but it should work (untested). Let me know!  Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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RE: [Zope-dev] ZClass inheriting from Python Class
by Miller, John M. 22 Jul '99

22 Jul '99

Heya, If I've read and interpreted the Documentation properly, you need to make your Python class a subclass of BoboPOS.Persistent. Then I think you need to do something like get_transaction().commit() when you want to commit changes you've made. Though it may be that Zope takes care of transactions most of the time and you don't have to worry about this. I also just discovered a 27 page document on ZODB 3 (cool! the more stuff to read, the better I say) which definitely will have a more definitive answer than my casual hack. ZODB-ly yours, (pronounced zodebely, rhymes with notably, of course) John > -----Original Message----- > From: Martijn Faassen [SMTP:faassen@vet.uu.nl] > Sent: Thursday, July 22, 1999 4:18 AM > To: zope-dev(a)zope.org > Subject: [Zope-dev] ZClass inheriting from Python Class > > Hi everybody, > > I've been toying with ZClasses. I made a simple Python class and > registered it with Zope as mentioned in the ZClass tutorial. Then I made > a ZClass that inherits from this Python class. I store some text data in > a list in the ZClass. > > This works fine, except when I restart Zope; the data in the list is > gone. Apparently the mixin Python class is not automatically persistent. > Is this what should happen? What do I do about it? > > Regards, > > Martijn > > _______________________________________________ > Zope-Dev maillist - Zope-Dev(a)zope.org > http://www.zope.org/mailman/listinfo/zope-dev > > (To receive general Zope announcements, see: > http://www.zope.org/mailman/listinfo/zope-announce > > For non-developer, user-level issues, > zope(a)zope.org, http://www.zope.org/mailman/listinfo/zope )

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Questions for ZOPE gods: Acquisition, etc.
by Andreas Kostyrka 22 Jul '99

22 Jul '99

Hi! I've been poking around in the 2.0.0a4 sources to allow subsiting (Folder in existing Zope + Domainname == Subsite ;) ), and I've developed some questions, that probably not many people will be able to answer: -) Is there anywhere documentation about Acquisition? How exactly is it intended to be used, etc. I've been reading the source code, so I think I'm breaking the Acquisition chain the right way at the subsite level, but thinking and knowing are different words. ;) -) I've actually done the ZPublisher subsite patch twice, and in both cases (dirty and the newer almost clean version), I get permission denied problems for my subsite folder. Now, after looking at the Application object and the Subfolder object, I'm getting the impression that a Folder cannot be the toplevel folder of a Zope database, right? Andreas -- Win95: n., A huge annoying boot virus that causes random spontaneous system crashes, usually just before saving a massive project. Easily cured by UNIX. See also MS-DOS, IBM-DOS, DR-DOS, Win 3.x, Win98.

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Re: [Zope-dev] ZOPE 2.0.0a4 INSTANCE_HOME/Products bug?
by Martijn Pieters 22 Jul '99

22 Jul '99

At 12:40 22/07/99 , Andreas Kostyrka wrote: >Hi! > >I've been wondering, if I'm doing something wrong: >-) I've created a lib/python/Products directory in my INSTANCE_HOME. >-) I've unpacked the Navigation-0.0.4.tar.gz, ZPyGreSQL-DA, etc. >-) All products show up in the control panel as loaded without problems. >BUT: >-) the navigate_filter method from Navigation is not found. >-) PostgreSQL database connection objects are displayed as broken: > kundendb (This object from the ZPyGreSQLDA product > is broken!) > >Now if I move the Products to the SOFTWARE_HOME >(Zope-2.0.0a4-src/lib/python/Products/*), all works well, so this smells >like a bug. >I'm using a RH5 Linux/intel with Python 1.5.2. > >External methods by the way work from the INSTANCE_HOME. :) Broken products have a 'Traceback' tab. What is displayed there? -- Martijn Pieters, Web Developer | Antraciet http://www.antraciet.nl | Tel: +31-35-7502100 Fax: +31-35-7502111 | mailto:mj@antraciet.nl http://www.antraciet.nl/~mj | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 ------------------------------------------

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ZOPE 2.0.0a4 INSTANCE_HOME/Products bug?
by Andreas Kostyrka 22 Jul '99

22 Jul '99

Hi! I've been wondering, if I'm doing something wrong: -) I've created a lib/python/Products directory in my INSTANCE_HOME. -) I've unpacked the Navigation-0.0.4.tar.gz, ZPyGreSQL-DA, etc. -) All products show up in the control panel as loaded without problems. BUT: -) the navigate_filter method from Navigation is not found. -) PostgreSQL database connection objects are displayed as broken: kundendb (This object from the ZPyGreSQLDA product is broken!) Now if I move the Products to the SOFTWARE_HOME (Zope-2.0.0a4-src/lib/python/Products/*), all works well, so this smells like a bug. I'm using a RH5 Linux/intel with Python 1.5.2. External methods by the way work from the INSTANCE_HOME. :) Andreas -- Win95: n., A huge annoying boot virus that causes random spontaneous system crashes, usually just before saving a massive project. Easily cured by UNIX. See also MS-DOS, IBM-DOS, DR-DOS, Win 3.x, Win98.

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creating one ZClass instance in the constructor of another
by Brian Hooper 22 Jul '99

22 Jul '99

Hi Zopistas - This is probably a really easy one, but I was wondering if anyone knows how to create an instance of one ZClass inside the constructor of a different ZClass. To illustrate with an example: I have defined two ZClasses, a ProjectManager and a GuestBook (I reimplemented the old Guestbook example product using ZClasses) as separate Products (since they are not really intrinsically related). I want to use the GuestBook in the ProjectManager, but I can't figure out how to create the GuestBook in the ProjectManager's constructor. I want to do something like  in the ProjectManager_add method; however, since the other Product's names don't seem to be defined in the namespace of ProjectManager_add, this doesn't work. Can anyone please tell me the magical solution to this problem? --Brian Hooper Digital Garage, Inc.

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ZClass inheriting from Python Class
by Martijn Faassen 22 Jul '99

22 Jul '99

Hi everybody, I've been toying with ZClasses. I made a simple Python class and registered it with Zope as mentioned in the ZClass tutorial. Then I made a ZClass that inherits from this Python class. I store some text data in a list in the ZClass. This works fine, except when I restart Zope; the data in the list is gone. Apparently the mixin Python class is not automatically persistent. Is this what should happen? What do I do about it? Regards, Martijn

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