[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 09:17, Bernd Dorn wrote:

>
> 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).
>

ups, forget the lines  below, i thought you were talking about IFoo 
(context)

> 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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>
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