+=item supersede OLD [, OPTION => VALUE ... ]
+
+Inserts this package as a successor to the package OLD. All options are as
+for C<insert>. After inserting, disables OLD and sets the new package as its
+successor.
+
+=cut
+
+sub supersede {
+ my ($new, $old, %options) = @_;
+ my $error;
+
+ $new->set('pkgpart' => '');
+ $new->set('family_pkgpart' => $old->family_pkgpart);
+ warn " inserting successor package\n" if $DEBUG;
+ $error = $new->insert(%options);
+ return $error if $error;
+
+ warn " disabling superseded package\n" if $DEBUG;
+ $old->set('successor' => $new->pkgpart);
+ $old->set('disabled' => 'Y');
+ $error = $old->SUPER::replace; # don't change its options/pkg_svc records
+ return $error if $error;
+
+ warn " propagating changes to family" if $DEBUG;
+ $new->propagate($old);
+}
+
+=item propagate OLD
+
+If any of certain fields have changed from OLD to this package, then,
+for all packages in the same lineage as this one, sets those fields
+to their values in this package.
+
+=cut
+
+my @propagate_fields = (
+ qw( pkg classnum setup_cost recur_cost taxclass
+ setuptax recurtax pay_weight credit_weight
+ )
+);
+
+sub propagate {
+ my $new = shift;
+ my $old = shift;
+ my %fields = (
+ map { $_ => $new->get($_) }
+ grep { $new->get($_) ne $old->get($_) }
+ @propagate_fields
+ );
+
+ my @part_pkg = qsearch('part_pkg', {
+ 'family_pkgpart' => $new->family_pkgpart
+ });
+ my @error;
+ foreach my $part_pkg ( @part_pkg ) {
+ my $pkgpart = $part_pkg->pkgpart;
+ next if $pkgpart == $new->pkgpart; # don't modify $new
+ warn " propagating to pkgpart $pkgpart\n" if $DEBUG;
+ foreach ( keys %fields ) {
+ $part_pkg->set($_, $fields{$_});
+ }
+ # SUPER::replace to avoid changing non-core fields
+ my $error = $part_pkg->SUPER::replace;
+ push @error, "pkgpart $pkgpart: $error"
+ if $error;
+ }
+ join("\n", @error);
+}
+