Try this: 

before 'custom_field' => sub {
    my $self = shift;
    if (scalar @_ == 1) {
        my $key = shift;
        confess "The field $key does not exist"
            unless $self->has_custom_field( $key );
    }
};

[download]

-stvn

In reply to Re: Setting a custom hash accessor handle in Moose attribute by stvn
in thread Setting a custom hash accessor handle in Moose attribute by daverave

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