That is exactly it! Thanks! For reference, here's what I did, and now everything works as a charm: 
sub normalize_column_values {
  my $self = shift;
  my $hashref = shift;

  if (exists $hashref->{password}) {
    $hashref->{password} = Digest::MD5::md5_base64($hashref->{password
+});
  }
}

[download]
Thanks!

-- zigdon

In reply to (z) Re^2: SUPER and Class::DBI by zigdon
in thread (z) SUPER and Class::DBI by zigdon

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