+ GetPatronLists( { patron_list_id => scalar $cgi->param('patron_list_id') } );
+
+my @existing = $list->patron_list_patrons;
+
+my $patrons_by_id = $cgi->param('patrons_by_id');
+my $id_column = $cgi->param('id_column');
+
+if ( $patrons_by_id ){
+ push my @patrons_list, uniq( split(/\s\n/, $patrons_by_id) );
+ my %add_params;
+ $add_params{list} = $list;
+ $add_params{ $id_column } = \@patrons_list;
+ my @results = AddPatronsToList(\%add_params);
+ my $id = $id_column eq 'borrowernumbers' ? 'borrowernumber' : 'cardnumber';
+ my %found = map { $_->borrowernumber->$id => 1 } @results;
+ my %exist = map { $_->borrowernumber->$id => 1 } @existing;
+ my (@not_found, @existed);
+ foreach my $patron ( @patrons_list ){
+ push (@not_found, $patron) unless defined $found{$patron};
+ push (@existed, $patron) if defined $exist{$patron};
+ }
+ $template->param(
+ not_found => \@not_found,
+ existed => \@existed,
+ id_column => $id_column,
+ );
+}