■
Catalyst::Plugin::Authentication::Store::DBIC::User - A user object representing an entry in a database. - metacpan.org
のrolesメソッドにおいて、
_search_rolesの実装、
$search->{ "me.$role_field" } = { -in => \@wanted_roles } if @wanted_roles;
rolesのカラムを、not nullにすべき。(∵ -in)
(途中)