[Zope] Getting an object from it's id
Hi,
This is obviously a newbie question.
I have several places in my dtml code where in order to obtain an object I
loop through objects of that kind and make a test to determine if each
objects id matches the id I picked up from a form.
This is the only way I could get it to work; but I feel there must be a
better, more efficient way.
Here is an example:
dtml-in expr="objectValues('Folder')"
dtml-if "myId==id"
Once I get a match I then proceed to use it in subsequent code, such as a
dtml with id and it works since id now refers to the object I'm interested
in.
Is there a Zope API method that will allow me to get an object from it's id,
or can I write a simple Python method to do it, or am I missing something
even more obvious?
Thanks
Geoff Armstrong
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Re: [Zope] Getting an object from it's id
[[EMAIL PROTECTED]]
| Is there a Zope API method that will allow me to get an object from
| it's id, or can I write a simple Python method to do it, or am I
| missing something even more obvious?
Well, sometimes objectItems or objectValues can be the right ones to
use. Other times, (in Python Products at least) you use _getOb() to
fetch the object for you.
Let's say you have this object structure:
/Folder1
/Folder2
If you (in Python code) have Folder1 in the namespace, as self for
example, you can say object=self._getOb('Folder2'), and vila. :)
Don't know how you would do that in DTML, though.
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Re: [Zope] Getting an object from it's id
On Tue, 23 Jan 2001, Gale wrote:
dtml-in expr="objectValues('Folder')"
dtml-if "myId==id"
You don't need to "get" the object, as the object is already on top of
the namespace stack (dtml-in put the object there on every iteration). Just
use the object's attributes (id, after all, is just yet another attribute).
Oleg.
Oleg Broytmann http://www.zope.org/Members/phd/ [EMAIL PROTECTED]
Programmers don't die, they just GOSUB without RETURN.
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Re: [Zope] Getting an object from it's id
on 1/23/01 12:34 PM, Oleg Broytmann at [EMAIL PROTECTED] wrote:
On Tue, 23 Jan 2001, Gale wrote:
dtml-in expr="objectValues('Folder')"
dtml-if "myId==id"
What I'm trying to do here is avoid using dtml-in, since in order for it to
put the object in the namespace it has to iterate over all of them (there
could be any number).
All I have at the beginning is the name of the object in the REQUEST part of
the namespace as picked up from a form. My method is the action to that
form.
In DTML there doesn't seem to be a way of saying, "I have this string with
the name of an object, now fetch me the object."
Geoff
You don't need to "get" the object, as the object is already on top of
the namespace stack (dtml-in put the object there on every iteration). Just
use the object's attributes (id, after all, is just yet another attribute).
Oleg.
Oleg Broytmann http://www.zope.org/Members/phd/ [EMAIL PROTECTED]
Programmers don't die, they just GOSUB without RETURN.
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Re: [Zope] Getting an object from it's id
+---[ Geoff Armstrong ]--
| on 1/23/01 12:34 PM, Oleg Broytmann at [EMAIL PROTECTED] wrote:
|
| In DTML there doesn't seem to be a way of saying, "I have this string with
| the name of an object, now fetch me the object."
if objectname is actually a variable with the name...
dtml-with "_.getitem(objectname,0)"
or dtml-call "REQUEST.set('fooobject',_.getitem(objectname,0))" to
get the object into a variable to pass or manipulate.
--
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Re: [Zope] Getting an object from it's id
Geoff Armstrong wrote: What I'm trying to do here is avoid using dtml-in, since in order for it to put the object in the namespace it has to iterate over all of them (there could be any number). All I have at the beginning is the name of the object in the REQUEST part of the namespace as picked up from a form. My method is the action to that form. In DTML there doesn't seem to be a way of saying, "I have this string with the name of an object, now fetch me the object." Hi Geoff, Try using _.getitem(), as in: dtml-let myObject="_.getitem(myId)" ... dtml-call myObject.foo ... /dtml-let or probably: dtml-let myObject="_.getitem(REQUEST['myId'])" If you aren't sure of the existance of the object, wrap the above in: dtml-if "_.hasattr(this(), REQUEST['myId'])" /dtml-if Ivan ___ 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] Getting an object from it's id
From: Geoff Armstrong [mailto:[EMAIL PROTECTED]]
In DTML there doesn't seem to be a way of saying, "I have this string with
the name of an object, now fetch me the object."
Shure there is:
dtml-var "some_container_object[remote_id].title"
As far as I remember.
regards Max M
A snippet I use somewhere:
dtml-in "emner[_['sequence-item']].objectValues('maal')"
dtml-var titlebr
dtml-var descriptionbrbr
/dtml-in
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Re: [Zope] Getting an object from it's id
on 1/23/01 1:12 PM, Erik Enge at [EMAIL PROTECTED] wrote:
Thanks; but being new to this could you help me a bit more by providing an
example of how to use 'getOb' within dtml code. I tried testing in; but
couldn't get it work.
Geoff
[[EMAIL PROTECTED]]
| Is there a Zope API method that will allow me to get an object from
| it's id, or can I write a simple Python method to do it, or am I
| missing something even more obvious?
Well, sometimes objectItems or objectValues can be the right ones to
use. Other times, (in Python Products at least) you use _getOb() to
fetch the object for you.
Let's say you have this object structure:
/Folder1
/Folder2
If you (in Python code) have Folder1 in the namespace, as self for
example, you can say object=self._getOb('Folder2'), and vila. :)
Don't know how you would do that in DTML, though.
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Re: [Zope] Getting an object from it's id
on 1/23/01 1:20 PM, Ivan Cornell at [EMAIL PROTECTED] wrote: Hi Ivan, Thanks. The "_.getitem(myId)" works well. I've made a note of the "hasattr" trick as well for future reference. Geoff Geoff Armstrong wrote: What I'm trying to do here is avoid using dtml-in, since in order for it to put the object in the namespace it has to iterate over all of them (there could be any number). All I have at the beginning is the name of the object in the REQUEST part of the namespace as picked up from a form. My method is the action to that form. In DTML there doesn't seem to be a way of saying, "I have this string with the name of an object, now fetch me the object." Hi Geoff, Try using _.getitem(), as in: dtml-let myObject="_.getitem(myId)" ... dtml-call myObject.foo ... /dtml-let or probably: dtml-let myObject="_.getitem(REQUEST['myId'])" If you aren't sure of the existance of the object, wrap the above in: dtml-if "_.hasattr(this(), REQUEST['myId'])" /dtml-if Ivan ___ 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 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 )
