[Dbix-class] Arbitrary SQL + ResultSet

[Jeremy Koch]

I am having trouble getting the results of a fairly complex query returned in
a D::C::ResultSet object.  Following the example found in the D::C::Manual:Cookbook
"Arbitrary SQL through a custom ResultSource" doesn't work out for my query.

Relevent query snippit:

    WHERE
       username NOT IN( ? )

Perl snippit:

    my $attr = { bind => [ qw(joeuser doeuser moeuser) ] };
    my $rs = $dbic->resultset('ExportCustomer')->search( {}, $attr );

The placeholder expects a single value but I need to pass in an unknown number of
values.  How can I express this?

-Jeremy