[Zope] Override members values

[Jonathan]

----- Original Message ----- 
From: "Garito" <garito at sistes.net>
To: "Lista Zope Internacional" <zope at zope.org>
Sent: Monday, July 10, 2006 1:13 PM
Subject: Re: [Zope] Override members values


> Jonathan escribió:
>>
>> ----- Original Message ----- From: "Garito" <garito at sistes.net>
>>> I try again:
>>>
>>> I have a property on the property manager called member1 with a value of 
>>> "[/some/path]"
>>>
>>> User1 ask for this property. We calculate the real value for /some/path 
>>> for these user: 1
>>> User2 ask for this property. We calculate the real value for /some/path 
>>> for these user: 2
>>>
>>> I have a property on the property manager called member2 with a value of 
>>> "[a reference to the calculator]"
>>>
>>> A user ask for this property from his firefox. We calculate the real 
>>> value for the reference for this browser: <result1>
>>> Another user ask for this property from his ie. We calculate the real 
>>> value for the reference for this browser: <result2>
>>>
>>> I would like to change the "accessor" for any property in my Zope 
>>> product
>>>
>>> How can I?
>>
>>
>> If I understand what you are trying to accomplish (of which I am not 
>> completely sure)...then you could create a script that accesses the 
>> object and returns a value based on the user agent string:
>>
>> eg.
>>
>> import string
>> REQUEST = container.REQUEST
>>
>> targetObject = context.restrictedTraverse('/some/path/objId')
>>
>> if string.find(REQUEST['HTTP_USER_AGENT'], 'Firefox') != -1:
>>   <do something with targetObject.attribute for Firefox users)
>> elif string.find(REQUEST['HTTP_USER_AGENT'], 'MSIE') != -1:
>>   <do something with targetObject.attribute for Internet Explorer users)
>> else:
>>   <do something with targetObject.attribute for xxx users)
>>
>> Note: 'attribute' is whatever property you have defined for the object.
>>
>> hth
>>
>> Jonathan
> Good Jonathan, something like this is on my mind but where I need to put a 
> piece of code like this?
>
> __getattr__?
> __bobo_traverse__?
> another place?
>
> I work with __bobo_traverse__ for some purposes but I would like a place 
> like __getattr__ because is where I go when I need an object's member 
> (__hasattr__ too) and __bobo_traverse__ need to returns an object not a 
> value
>
> __getattr__ some of you (I don't remember how exactly, sorry) have said is 
> a member to use only if there are no other way and I'm a little scared for 
> that

I have no idea how your application is designed/structured, but one possible 
solution is to create a python script and place it in the path to the object 
you want to access.  For example, if the python script is called pScript 
then:

/some/path/pScript/objectId

the python script 'pScript' will get executed and can access a variable in 
REQUEST called 'traverse_subpath' - which is a list, and in the above case 
has only 1 element which is a string containing 'objectId'.  You can then 
use this string in the restrictedTraverse command to get access to the 
object:

REQUEST = container.REQUEST
targetObject = context.restrictedTraverse('/some/path/some/folder/'+ 
REQUEST['traverse_subpath'][0])



Jonathan