[Zope] String to object ID

[Goodrichs]

Yessiree bob, and it works great too! As soon as we get it finalized into a
tool we will write it up and post it on the members site with due credit to
Evan!

DAve.


At 8:32 AM -0500 12/8/99, Chris McDonough wrote:
>Now this is cool.
>
>Chris McDonough     mailto:chrism@digicool.com
>Digital Creations   http://www.digicool.com
>Publishers of Zope  http://www.zope.org
>
>> -----Original Message-----
>> From: Evan Simpson [mailto:evan@tokenexchange.com]
>> Sent: Monday, December 06, 1999 10:45 AM
>> To: zope@zope.org; Goodrichs
>> Subject: Re: [Zope] String to object ID
>>
>>
>> I missed some of the prior discussion, so I hope this isn't
>> irrelevent.
>>
>> Are you trying to access an object given a string such as
>> 'hie/dee/hoe'?  If
>> so, try this:
>>
>> DTML Method FetchObj:
>> <dtml-let obj="[_]">
>>   <dtml-in expr="_.string.split(fetchStr, '/')">
>>     <dtml-call expr="obj.append(obj.pop()[_['sequence-item']])">
>>   </dtml-in>
>>   <dtml-return expr="obj[0]">
>> </dtml-let>
>>
>> example call:  <dtml-var expr="_.render(FetchObj(_.None, _,
>> fetchStr='hie/dee/hoe').id)">
>>
>> Some notes about the above:
>> o We start with a list containing the global namespace object.
>> o For each path element, we pop the current object, find the
>> sub-object, and
>> put it back in the list.
>> o You could use REQUEST.set instead of the list foolery if
>> you wanted to.
>> o _.render is necessary since the .id of folders is a string,
>> while that of
>> methods is a method :-P
>>
>> If you use PythonMethods, the above can be more simply written as:
>>
>> PythonMethod FetchObj:
>> <params>_, fetchStr, attr=None</params>
>> obj = _
>> for p in string.split(fetchStr, '/'):
>>   obj = obj[p]
>> if attr is None:
>>   return obj
>> else:
>>   return render(_.getattr(obj, attr))
>>
>>
>> <dtml-var expr="FetchObj(_, 'hie/dee/hoe', 'id')">
>>
>> ----- Original Message -----
>> From: Goodrichs <nbd95@macconnect.com>
>> > Well I still don't know how to reference a Zope object from
>> a string, but
>> I
>> > have a interim solution for now.
>>
>>
>>
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