[Zope] namespace acquisition in product methods

[Michel Pelletier]

"Guido A.J. Stevens" wrote:
> 
> Hi,
> 
> I'm writing a product and am starting from 'boring'. Immediately I'm
> running into namespace problems :-(....
> 
> Basically, I modified the boring product only slightly:
> 
>         def __init__(self, id, title='', REQUEST=None):
>                 """initialise a new instance of NFG_SiteMap"""
>                 self.id = id
>                 self.title = title
>                 self.REQUEST=REQUEST

eek!  Don't hold onto the REQUEST object.  Allways use the one provided
to you on each request.
> 
>         def namespace(self):

Make this def namespace(self, REQUEST)

>                 return "%s" % (self.REQUEST)
> 
> That is, I'm trying to test my access to the REQUEST parameters by
> calling a <dtml-var namespace> in the index_html dtml document.
> For the rest, the boring product setup is intact, inheritance etc. unchanged.
> 
> Something very interesting happens:
> - when I add a new instance to the root folder of my zope
> installation, this works as intended. Index_html prints out lots of
> interesting environment.
> - when I add a new instance to a sub folder:
>   * the management tabs disappear
>   * the REQUEST appears to be 'None'
> - when I copy the working root folder instance into the subfolder,
> that copy functions normally with management tabs and REQUEST info.
> 
> What am I missing here? Why do the class instances behave differently
> if they're in the same location, but created in different locations?
> 
> :*CU#
> --
> ***    Guido A.J. Stevens      ***    mailto:gyst@nfg.nl    ***
> ***    Net Facilities Group    ***    tel:+31.43.3618933    ***
> ***    http://www.nfg.nl       ***    fax:+31.43.3560502    ***
> 
> Perhaps the deeper one probes and the greater one's commitment
> to, and dependence on, information technology, the more resistant
> one may become to its essence.
> [Coyne, ISBN 0-262-03228-7, p.315]
> 
> _______________________________________________
> Zope maillist  -  Zope@zope.org
> 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 )