[Zope-dev] Comparing folder instances
Hi,
A quick question. How do I compare folder instances ?(or any instances
as a matter of fact).
Here is a simple code showing what I tried:
dtml-in "objectValues(['Folder'])"
dtml-var "_.getitem('sequence-item')"
dtml-var "images"
dtml-var "_.getitem('sequence-item')==images"
/dtml-in
Here is now the resulting HTML
Folder instance at 85cf958
Folder instance at 85cf958
0
Folder instance at 858a168
Folder instance at 85cf958
0
Why isn't the first comparison returning true? What I want to use is
something like:
dtml-in "objectValues(['Folder'])"
dtml-if "_.getitem('sequence-item')==images"
EQUAL
dtml-else
NOT EQUAL
/dtml-if
/dtml-in
Thanks a lot in advance for your comments.
Carl
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[Zope-dev] Re: Acquisition Wrappers Bit Again ;-)
Hi Criss,
Thanks a lot for your quick response!! Since I'm a new Zope user, I
guess I'll just cut-paste the line you suggest without trying to
understand for the moment ;-)
Carl
Carl Robitaille wrote:
dtml-var "_.getitem('sequence-item')"
dtml-var "images"
dtml-var "_.getitem('sequence-item')==images"
Folder instance at 85cf958
Folder instance at 85cf958
Congratulations, you've just been bitten by the thing that confused me
for half a day...
You see, while they say Folder instance at 85cf958, they're actually
lying ;-)
The objects you're comparing are actually acquisition wrappers.
IMHO, == should work with acquisition to make problems like the above
not happen. I suggested this, and Jim Fulton agreed:
http://zope.nipltd.com/public/lists/dev-archive.nsf/ByKey/08240A8E0D50AEE0
Sadly, nothing seems to have been done about it :(
Maybe you should chuck it in the collector as a bug in the
ExtensionClass?
cheers,
Chris
PS: In the meantime, the following should work:
dtml-in "objectValues(['Folder'])"
dtml-if
"_.getattr(_.getitem('sequence-item'),'aq_base',_.getitem('sequence-item'))==_.getattr(images,'aq_base',images)"
EQUAL
dtml-else
NOT EQUAL
/dtml-if
/dtml-in
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[Zope-dev] Re: Acquisition Wrappers Bit Again ;-)
Hi,
Just for the record, Criss' suggestion didn't work for me. I don't
quite get why though Here's the code again, where images is a
Folder:
dtml-in "objectValues(['Folder'])"
dtml-if
"_.getattr(_.getitem('sequence-item'),'aq_base',_.getitem('sequence-item'))==_.getattr(images,'aq_base',images)"
EQUAL
dtml-else
NOT EQUAL
/dtml-if
/dtml-in
The error I get from Zope is:
File /home/zope/Zope2/lib/python/DocumentTemplate/DT_Util.py, line 337,
in eval
(Object:
_.getattr(_.getitem('sequence-item'),'aq_base',_.getitem('sequence-item'))==_.getattr(images,'aq_base',images))
(Info: images)
File string, line 0, in ?
File /home/zope/Zope2/lib/python/DocumentTemplate/DT_Util.py, line 140,
in careful_getattr
AttributeError: aq_base
It's looks like aq_base is not available. I read Shane's Acquisition
Understander How-To. I created the ExternalMethod that used aq_base and
it works like a charm. I tried a lot of things even if I didn't have a
good undersanding of the problem. The only time I got a valid code (Zope
not complaining when hitting the Change button) was with that line:
dtml-if
"_.getattr(_.getitem('sequence-item'),'images.aq_base',_.getitem('sequence-item'))==_.getattr(images,'images.aq_base',images)"
You probably know why it doesn't give the right result, but I don't
have a clue. It's still not returning true when sequence-item is
matching the images Folder. Is there anything I can read to understand
what I'm dealing with? Or maybe somebody knows what I'm doing wrong...
again
Carl
Carl Robitaille wrote:
Hi Criss,
Thanks a lot for your quick response!! Since I'm a new Zope user, I
guess I'll just cut-paste the line you suggest without trying to
understand for the moment ;-)
Nih!
Welcome to the deep end ;-)
cheers,
Chris
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Re: [Zope-dev] Weird Data.fs corruption...
Hi, That's because your problem only existed for a few hours. Sigh. I'm using the CVS version of Zope2. We try to keep this stable, but no guarantees. Some changes were checked into CVS on Monday night that caused the problem you observed. That's all right. I'm just an unlucky bastard, that's all ;-) Right. The bug caused the file pointer to get incorrectly set at 0, so transactions after the copy/paste errors were written at the beginning of the file. Thanks for the info. Carl ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
