[Zope-dev] Re: zcml filtering

[Philipp von Weitershausen]

Marius Gedminas wrote:
> On Tue, Aug 05, 2008 at 10:36:30PM +0100, Martin Aspeli wrote:
>> Subscribers and subscription adapters are particularly bad in this way, 
>> since they are unnamed and thus can't be "overridden", only amended to.
>>
>> We've talked about an "off" switch for ZCML before. Given that we have a 
>> configuration machine that's capable of doing overrides based on 
>> discriminators, why couldn't we have support for negatives, e.g.
>>
>> <unconfigure>
>>    <utility ... />
>> </unconfigure>
>>
>> This could use a special _context that would record callables and 
>> discriminators, and then look for the corresponding 
>> callables/discriminators in the real context and remove them before that 
>> context was configured.
> 
> Subscribers don't have discriminators, unfortunately.

Indeed they don't. That just makes them harder to track down, though.

I'm working on a package for this functionality in z3c.unconfigure right 
now. Name inspired by Martin's suggestion above; my original prototype 
used had a different name but this is much better :).