[Zope] Override members values

[Garito]

Garito escribió:
> Jonathan escribió:
>>
>> ----- 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
>>
>>
> Sure, but I would like to put it to act like
>
> print Object.member
>
> and the value is the result of your code
>
> Where I put the code?
>
> If I want to override the () member of a object I override __call__, 
> if I want to override the str(object) I override __str__, right?
>
> How can I override the object.<member> ?
>
Perhaps like this? (the __get__ member?)
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/408713

This will be the best solution?

-- 
Mis Cosas
http://blogs.sistes.net/Garito