SL::DB::Note: Funktion trans_object zum Auslesen des referenzierten Objekts

Ein Note-Objekt hängt immer an einem anderen Datenbankobject, das über
trans_module+trans_id referenziert wird. Diese Funktion entscheidet
anhand von trans_module, welche Rose-Klasse zu instantiieren ist, holt
das entsprechende Objekt aus der Datenbank und gibt es zurück.

Auch bei polymorphen Objekten wie Kunden/Lieferanten (für trans_module
== ct) wird das richtige getan.

diff --git a/SL/DB/Note.pm b/SL/DB/Note.pm
index c539d6a..477ae3c 100644 (file)
--- a/SL/DB/Note.pm
+++ b/SL/DB/Note.pm
@@ -1,10 +1,9 @@
-# This file has been auto-generated only because it didn't exist.
-# Feel free to modify it at will; it will not be overwritten automatically.
-
 package SL::DB::Note;
 
 use strict;
 
+use Carp;
+
 use SL::DB::MetaSetup::Note;
 
 
@@ -21,5 +20,76 @@ __PACKAGE__->meta->initialize;
 # Creates get_all, get_all_count, get_all_iterator, delete_all and update_all.
 __PACKAGE__->meta->make_manager_class;
 
+sub trans_object {
+  my $self = shift;
+
+  croak "Method is not a setter" if @_;
+
+  return undef if !$self->trans_id || !$self->trans_module;
+
+  if ($self->trans_module eq 'fu') {
+    require SL::DB::FollowUp;
+    return SL::DB::Manager::FollowUp->find_by(id => $self->trans_id);
+  }
+
+  if ($self->trans_module eq 'ct') {
+    require SL::DB::Customer;
+    require SL::DB::Vendor;
+    return SL::DB::Manager::Customer->find_by(id => $self->trans_id)
+        || SL::DB::Manager::Vendor  ->find_by(id => $self->trans_id);
+  }
+
+  return undef;
+}
 
 1;
+__END__
+
+=pod
+
+=encoding utf8
+
+=head1 NAME
+
+SL::DB::Note - Notes
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item C<trans_object>
+
+A note object is always attached to another database entity. Which one
+is determined by the columns C<trans_module> and C<trans_id>. This
+function looks at both, retrieves the corresponding object from the
+database and returns it.
+
+Currently the following three types are supported:
+
+=over 2
+
+=item * C<SL::DB::FollowUp> for C<trans_module == 'fu'>
+
+=item * C<SL::DB::Customer> or C<SL::DB::Vendor> for C<trans_module ==
+'ct'> (which class is used depends on the value of C<trans_id>;
+customers are looked up first)
+
+=back
+
+The method returns C<undef> in three cases: if no C<trans_id> or no
+C<trans_module> has been assigned yet; if C<trans_module> is unknown;
+if the referenced object doesn't exist.
+
+This method is a getter only, not a setter.
+
+=back
+
+=head1 BUGS
+
+Nothing here yet.
+
+=head1 AUTHOR
+
+Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
+
+=cut