[PEAK] PyProtocols: TypeError: Ambiguous adapter choice

[Sergey Schetinin]

Are you sure it's the "foo = FooOneAsFoo(ComposedFoo())" producing the
error? Could it actually be IFoo(ComposedFoo()) ?

2009/7/10 luper rouch <luper.rouch at gmail.com>:
> The following code produces an error:
>
> TypeError: ('Ambiguous adapter choice', <class
> '__main__.FooOneAsFoo'>, <class '__main__.FooTwoAsFoo'>, 2, 2)
>
> --- code begins ---
>
> from protocols import Interface, advise
>
> class IFoo(Interface):
>    pass
>
> class IFooOne(Interface):
>    pass
>
> class IFooTwo(Interface):
>    pass
>
> class FooOneAsFoo(object):
>    advise(
>            instancesProvide=[IFoo],
>            asAdapterForProtocols=[IFooOne]
>        )
>
> class FooTwoAsFoo(object):
>    advise(
>            instancesProvide=[IFoo],
>            asAdapterForProtocols=[IFooTwo]
>        )
>
> class ComposedFoo(object):
>    advise(
>            instancesProvide=[IFooOne, IFooTwo]
>        )
>
> --- code ends ---
>
> Why is it ambiguous to write for example:
>
> foo = FooOneAsFoo(ComposedFoo())
>
> foo has an IFoo interface, adapted from the IFooOne interface of ComposedFoo.
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-- 
Best Regards,
Sergey Schetinin

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