--- /dev/null
+package SL::DB::Manager::Project;
+
+use strict;
+
+use parent qw(SL::DB::Helper::Manager);
+
+use SL::DB::Helper::Paginated;
+use SL::DB::Helper::Sorted;
+
+sub object_class { 'SL::DB::Project' }
+
+__PACKAGE__->make_manager_methods;
+
+our %project_id_column_prefixes = (
+ ar => 'global',
+ ap => 'global',
+ oe => 'global',
+ delivery_orders => 'global',
+);
+
+our @tables_with_project_id_cols = qw(acc_trans ap ar delivery_order_items delivery_orders invoice oe orderitems rmaitems);
+
+sub _sort_spec {
+ return (
+ default => [ 'projectnumber', 1 ],
+ columns => {
+ SIMPLE => 'ALL',
+ customer => 'customer.name',
+ });
+}
+
+sub is_not_used_filter {
+ my ($class, $prefix) = @_;
+
+ my $query = join ' UNION ', map {
+ my $column = $project_id_column_prefixes{$_} . 'project_id';
+ qq|SELECT DISTINCT ${column} FROM ${_} WHERE ${column} IS NOT NULL|
+ } @tables_with_project_id_cols;
+
+ return ("!${prefix}id" => [ \"(${query})" ]);
+}
+
+1;
+__END__
+
+=pod
+
+=encoding utf8
+
+=head1 NAME
+
+SL::DB::Manager::Project - Manager for models for the 'project' table
+
+=head1 SYNOPSIS
+
+This is a standard Rose::DB::Manager based model manager and can be
+used as such.
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item C<is_not_used_filter>
+
+Returns an array containing a partial filter suitable for the C<query>
+parameter that limits to projects that are not referenced from any
+other database table.
+
+=back
+
+=head1 BUGS
+
+Nothing here yet.
+
+=head1 AUTHOR
+
+Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
+
+=cut