[Zope3-dev] adaptation based on class rather than interface

[Martin Aspeli]

Chris Withers wrote:
> 
> Hi All,
> 
> I find myself often having to define pure marker interfaces for each 
> class that I define, purely so I can register adapters for objects of 
> that class.
> 

Why does your class not have a (non-marker) interface in the first place?
The use of interfaces as documentation and as formalisms for expressing a
class' functionality (in adapters, utilities etc) is one of the benefits
that Zope 3 introduces. I can see how they may not always add that much
value immediately, but they are a good way of ensuring things are reasonably
well-defined, well-documented and easily locatable. I'd rather start from
interface design and implement as necessary, than think of interfaces as
necessary evils of the CA, personally.

Martin
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