That's because use Class::MethodMaker executed before @fields = qw(id name). See details in perlmod. Just list fields directly in use statement: 

use Class::MethodMaker
        get_set => [ qw(id name) ],
        new => "new";

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P.S.: also http://www.effectiveperlprogramming.com/blog/1068

In reply to Re: Class::MethodMaker dynamic fields by zwon
in thread Class::MethodMaker dynamic fields by Mainframe2007

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