in reply to Of moose and ducks (or: how to coerce from non-Moose type objects)

You could have also done this ... 

class_type('Bio::Seq');

coerce 'DNAString'
  => from 'Bio::Seq'
  => via { $_->seq };

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Moose class types are not restricted to Moose created classes, you can make one for any plain old Perl class. Of course the version you have is more flexible, assuming you know you can trust the seq method.

-stvn

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Re^2: Of moose and ducks (or: how to coerce from non-Moose type objects)
by tospo (Hermit) on Jan 10, 2011 at 10:51 UTC
    Ah, ok - I didn't know the class_type construct. That's a useful one. But in this case, I think my version is more suitable because there are many BioPerl classes that implement a 'seq' method, so ducktyping is indeed more flexible.
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