[Zope3-Users] Re: Re: Checking if an interface is provided by an object or could be adapted to

[Bernd Dorn]

On 01.05.2006, at 02:17, Martin Aspeli wrote:

> On Mon, 01 May 2006 00:55:46 +0100, Stephan Richter  
> <srichter at cosmos.phy.tufts.edu> wrote:
>
>> On Sunday 30 April 2006 19:34, Bernd Dorn wrote:
>>> component.queryMultiAdapter((bar,baz), IFoo) is not None or False
>>
>> Why not just:
>>
>> component.queryMultiAdapter((bar,baz), IFoo, default=False)
>
> Well, it seems that if I have:
>
>>>> class Foo(object):
>     .    implements(IFoo)
>
>>>> context = Foo()
>>>> component.queryAdapter(foo, IFoo, default=None)
> None

this looks for an adapter for all interfaces provided by foo to IFoo  
regardless if foo already implements IFoo.

what should it return instead? foo?


>
> I assume it's the same with single adapters? As I said, I may well  
> be doing something wrong, but that's what was happening to me  
> (using Five, Zope 2.9.2). If it makes any difference, the interface  
> in question (IFoo) was applied to the class Foo using <implements>  
> in ZCML (legacy/backwards compatability issue).

hm, that's odd

is the interface provided by the object?

IFoo.providedBy(context)

if not, there may be an error in the zcml


>
> Martin
>
> -- 
> "You can just adapt yourself out of it..." // Archipelago sprint  
> 26/04/2006
>
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