Re: [Zope] Newbie question on page counters
Richard,
I'd recommend getting the Zope Quick Reference (ZQR) from
http://zdp.zope.org (the zope documentation project).
I'ts invaluable.
Phil
[EMAIL PROTECTED]
- Original Message -
From: Richard P. Muller <[EMAIL PROTECTED]>
To: Chris Withers <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, July 27, 2000 11:44 PM
Subject: Re: [Zope] Newbie question on page counters
> Chris Withers wrote:
> >
> > Chris Withers wrote:
> > > To do what you want, you probably want something like:
> > >
> > > > >
"manage_changeProperties(counter_value=getProperty(counter_value,counter_sta
rting_value-1)+1)">
> >
> > Erk, maybe this:
> > >
> >
"manage_changeProperties(counter_value=getProperty('counter_value',getProper
ty(counter_starting_value,0)-1)+1)">
> >
> > Chris
>
> Words simply cannot express my gratitude. Can you clue me in a bit more
> on the functions you called. Looks like they are
> manage_changeProperties(), getProperty(). I'm guessing these are both
> Python functions. Where are they documented, so I can learn more?
>
> You mentioned that (1) DTML is not a programming language, and that (2)
> ZODB is a bad place to start on Zope programming. By these two points,
> should I infer that learning how to write external methods in Python
> *is* a good place?
>
> Can you, or someone else on the list, give me a suitable homework
> assignment for a first Zope programming project? I was toying with the
> idea of writing a checkbook register in Zope, but I think it might be
> beyond my capacities right now.
>
> Thanks again,
>
> Rick
> --
> Richard P. Muller, Ph.D.
> [EMAIL PROTECTED]
> http://www.wag.caltech.edu/home/rpm
>
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Re: [Zope] Newbie question on page counters
"Richard P. Muller" wrote:
> >
>"manage_changeProperties(counter_value=getProperty('counter_value',getProperty(counter_starting_value,0)-1)+1)">
> Words simply cannot express my gratitude.
Wow, guess it worked then... that was a bit of luck (I didn't actually
test it ;-)
> Can you clue me in a bit more
> on the functions you called. Looks like they are
> manage_changeProperties(), getProperty(). I'm guessing these are both
> Python functions. Where are they documented, so I can learn more?
They are APIs/Interfaces exposed by Zope for manipulating properties (a
notoriously difficult thing to do in Zope :S)
See
http://www.zope.org/Members/michel/Projects/Interfaces/PropertyManager
for the full list.
> You mentioned that (1) DTML is not a programming language,
A half joke. DTML, IMHO, is not supposed to be a programming language
but until Python and Perl methods become freely available, you have
little option but to program in it. External Methods can be a real pain
(do NOT try using them with Zope versions ;-)
> ZODB is a bad place to start on Zope programming.
Not quite. My point was that storing highly dynamic data (such as a page
counter) in a transactional database like the ZODB's normal FileStorage
is a bad idea since you'll use up loads of disk space very quickly...
> By these two points,
> should I infer that learning how to write external methods in Python
> *is* a good place?
Er, maybe, but that's not what I'd recommend.
> Can you, or someone else on the list, give me a suitable homework
> assignment for a first Zope programming project? I was toying with the
> idea of writing a checkbook register in Zope, but I think it might be
> beyond my capacities right now.
My first port of call was the Zope Content Managers Guide
(http://www.zope.org/Documentation/Guides/ZCMG) I worked through that to
get the basics (The DTML Reference
(http://www.zope.org/Documentation/Guides/DTML) can help but is _really_
out of date)
Beehive (www.beehive.de) do what is allegedly quite a good guide to
ZClasses, which you'll want to know at some point.
You should be using Zope 2.2 as well. This has a Tutorial you can go
through which may cover the stuff above better (it should certainly be a
lot more up to date ;-) as well as a great 'help' button. It should also
have all the decent stable API's from
http://www.zope.org/Members/michel/Projects/Interfaces documented in it
by now.
There should also be a Zope Book on its way from O'Reilly which
hopefully make the whole thing a lot easier...
If I've missed something, I hope someone else will jump in and say so
:-)
Hope this helps,
Chris
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Re: [Zope] Newbie question on page counters
Chris Withers wrote:
>
> Chris Withers wrote:
> > To do what you want, you probably want something like:
> >
> > >
>"manage_changeProperties(counter_value=getProperty(counter_value,counter_starting_value-1)+1)">
>
> Erk, maybe this:
>
>
>"manage_changeProperties(counter_value=getProperty('counter_value',getProperty(counter_starting_value,0)-1)+1)">
>
> Chris
Words simply cannot express my gratitude. Can you clue me in a bit more
on the functions you called. Looks like they are
manage_changeProperties(), getProperty(). I'm guessing these are both
Python functions. Where are they documented, so I can learn more?
You mentioned that (1) DTML is not a programming language, and that (2)
ZODB is a bad place to start on Zope programming. By these two points,
should I infer that learning how to write external methods in Python
*is* a good place?
Can you, or someone else on the list, give me a suitable homework
assignment for a first Zope programming project? I was toying with the
idea of writing a checkbook register in Zope, but I think it might be
beyond my capacities right now.
Thanks again,
Rick
--
Richard P. Muller, Ph.D.
[EMAIL PROTECTED]
http://www.wag.caltech.edu/home/rpm
___
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Re: [Zope] Newbie question on page counters
Chris Withers wrote: > To do what you want, you probably want something like: > > >"manage_changeProperties(counter_value=getProperty(counter_value,counter_starting_value-1)+1)"> Erk, maybe this: Chris ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Newbie question on page counters
"Richard P. Muller" wrote: > I'm in the process of learning Zope hacking, and I'm having a really > hard time getting a page counter to work. It isn't even that page > counters are all that important to me, it's that I feel that if I can't > even do something this simple, what hope do I have doing something > really hard? The ZODB is a _really_ bad place to store a page counter, especially on a busy site. Data.fs will grow each time your counter increments. This is because it's a transactional daatbase with undo ability... > Here's what I've done. > (1) Under "Properties" I've created two properties (both ints) > counter_starting_value, which I've set to 11 (arbitrarily) > counter_value, which I've set to 0 Sounds good :-) > > > > > > > > > This didn't work. The error message reported that the syntax in the > first (and probably the second, but I never got past the first) dtml-let > command was wrong. Whoops, just remember this: DTML is not a programming language, it is designed for data presentation and form processing. Or something like that ;-) To do what you want, you probably want something like: Which isn't pretty :S cheers, Chris ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] Newbie question on page counters
I'm in the process of learning Zope hacking, and I'm having a really hard time getting a page counter to work. It isn't even that page counters are all that important to me, it's that I feel that if I can't even do something this simple, what hope do I have doing something really hard? Here's what I've done. (1) Under "Properties" I've created two properties (both ints) counter_starting_value, which I've set to 11 (arbitrarily) counter_value, which I've set to 0 (2) I then created a DTML method. I spent some time pouring through the DTML Reference, but I really didn't find a lot on how to modify variables. Here's what I tried: This didn't work. The error message reported that the syntax in the first (and probably the second, but I never got past the first) dtml-let command was wrong. I also tried things like # got a syntax value for dtml-var here #same problem here. Is there an easy way to do this? Thanks in advance, Rick -- Richard P. Muller, Ph.D. [EMAIL PROTECTED] http://www.wag.caltech.edu/home/rpm ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
