[Zope3-dev] Re: AW: deprecate ++etc++site/default?

[Philipp von Weitershausen]

Christian Theune wrote:
> I can't remember who I talked to about this who pointed out to me that,
> in most cases, you don't have to care about the `default` folder and can
> put the utilities that you don't want in content space just directly
> into the site manager.
> 
> Due to that I don't see a reason for a `default` site-management folder
> inside the site manager. I never had the use-case for more than one
> package, but I'm also somewhat unsure what they really are about.
> 
> I just re-read the doctests in zope.app.component and they only talk
> about the mechanics of the site managers and site-management folders.
> They give a vague hint that they can be used to "logically organize your
> software". I don't think I'm going to "organize" my software in the
> ZODB, so I'm a bit puzzled at what that means.

Site management folders had a meaning and incorporated machinery once. 
That's gone now. They're just dumb containers now. The 'default' thing 
is an artefact. It is totally possible to add your local utilities 
anywhere you want, they don't even have to be in a container as long as 
they're persisted in the registry.

In the interest of removing cruft and making things more 
straight-forward for newbies, 'default' should be ripped out. In the 
interest of existing projects, however, BBB must provided.

I suggest a hack: We remove 'default' and from now on put utilities 
directly into the site manager. For BBB, we allow access to a 'default' 
subcontainer which is faked::

   Let's get a site and look at its site manager:

     >>> site = getSite()
     >>> site_manager = site.getSiteManager()

   The site manager is empty or, in case of the root site manager, it has
   a few default utilities:

     >>> list(site_manager.keys())
     ['ErrorReportingUtility', 'ClientIDManager', ...]

   Even though there seems to be no 'default' folder anymore, it's still
   possible to get it:

     >>> default_folder = site_manager['default']
     >>> list(default_folder.keys())
     ['ErrorReportingUtility', 'ClientIDManager', ...]

   (I imagine site_manager.__getitem__ simply returning self when
    key == 'default')

   Note that adding a subitem called 'default' won't be allowed:

     >>> site_manager['default'] = object()
     Traceback (most recent call last):
     ...


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