[Zope-dev] Is _getOb() best way to grab a ref to a particular object?

[Brian Lloyd]

> I need to grab a reference to a particular object in the ZODB from an
> external method, bypassing acquisition.  Is this the right 
> way to do it:
> 
>     def test(self, REQUEST=None):
>         """doc string"""
>         myobj =
> REQUEST.PARENTS[-1].aTopLevelFolder.anotherFolder._getOb('id_o
> f_myobj')
>         ...do stuff with myobj: myobj.title, myobj.index_html,
> myobj.property = 123 ...

Maybe, maybe not... _getOb will not return an acquired object, but
if the object exists it _will_ be returned as a "wrapped" object
so acquisition will be preserved in the result. I'm not clear from
your example whether this is what you want. If you want the *resulting*
object to be non-acquiring, you'll want to do something like:

def test(self, REQUEST=None):
  """ """
  # get object named 'foo' from self, but dont allow it
  # to be found via acquisition.

  obj=self._getOb('foo')

  # while we know that foo is not acquired from above, it 
  # is still wrapped in the context of 'self', so to disable 
  # acquisition we need to unwrap it.

  non_aquiring_obj=obj.aq_base

  ...

Hope this helps!


Brian Lloyd        brian@digicool.com
Software Engineer  540.371.6909              
Digital Creations  http://www.digicool.com