Philipp von Weitershausen wrote:
>>> from zope.component import provideAdapter
>>> provideAdapter(str,(int,),str)
>>> from zope.component import getAdapter
>>> getAdapter(123,str)
'123'
Yay! That's _exactly_ what I want.
And that's exactly what I meant -- and wrote about half way up the
thread. :)
Yeah, but the words were wrong, so I didn't grok it.
A simple example as above would probably have done it ;-)
>>> provideAdapter(to_date,(str,int),DateTime)
This registers a multi adapter for (a_string, an_integer), like views
are multi-adapters for (context, request). You want to say:
>>> provideAdapter(to_date, (str,), DateTime)
>>> provideAdapter(to_date, (int,), DateTime)
Ahhhh... okay, I had to guess from this:
>>> help(provideAdapter)
Help on function provideAdapter in module zope.component:
provideAdapter(factory, adapts=None, provides=None, name='')
>>> provideAdapter(str,int,str)
Traceback...
...
TypeError: iteration over non-sequence
I guessed the wrong use of the sequence :-(
Shame provideAdapter doesn't have a docstring ;-)
Okay, so now I can do what I want:
>>> getAdapter('2006/11/16',DateTime)
DateTime('2006/11/16')
...except:
>>> getAdapter('moo',DateTime)
Traceback...
...
zope.component.interfaces.ComponentLookupError:
('moo', <class DateTime.DateTime.DateTime at 0x00E73600>, u'')
I'm guessing this is 'cos my adapter is returning None and that's a
"special value" meaning "couldn't adapt", right?
How would I _really_ return None from an adapter?
cheers,
Chris
--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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