Dear Mailing List,
i'm developing an utility to administrate some things in an intranet enviroinment.
I've got two tables one with 3 fields :
id,
seminar_group_id,
desc

and the other one that contains 3 fields also
id,
seminar_group_id
role_id

the second table contains the seminar group id that a role is able to see.
what i want to get is a complete list of the groups , and field that return true or false if a user can see the group.
i got this by executing this query
select
    a.id,
    group_name,
    role_id
from
    seminari_gruppi a
left join
    seminar_2_roles b
on
    ( a.id = b.seminar_group_id AND role_id = $role_id)

looking into google i've discovered that this can be done by using the from, and this is what i've done

my $allGroups_rs = $c->model('DbsMysql::Seminars::Gruppi')->search(undef,
    { from => \"
(SELECT a.id , group_name, group_desc, testo , img , role_id FROM seminari_gruppi a
                LEFT JOIN seminar_2_roles b
                    ON a.id = b.seminar_group_id
                    AND b.role_id = $id_role
            ) me"
        });

but... how can i access role_id ? as i can do a thing like this
push @{$json->{groups}} , {
               group_id  => $r->id,
            group_desc => $r->group_desc,
            group_name => $r->group_name,
cansee => defined $r->{role_id} ? JSON::XS::true : JSON::XS::false
           };
Thanks guys!

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