Movalog Blog

If you want to maintain backwards compatibility for Movable Type 3.2 users, Brad Choate created the following subroutine which you can use in your plugin's MT::App subclass

sub repair_class {
    my $app = shift;
    my ($class) = @_;
    require MT::Upgrade;
    my $driver = MT::Object->driver;
    my $diff = MT::Upgrade->class_diff($class);
    print STDERR "diff=$diff\n";
    if ($diff) {
        my @stmt;
        if ($diff->{fix}) {
            @stmt = $driver->fix_class($class);
        } else {
            if ($diff->{add}) {
                push @stmt, $driver->add_column($class, $_->{name})
                    foreach @{$diff->{add}};
            }
            if ($diff->{alter}) {
                push @stmt, $driver->alter_column($class, $_->{name})
                    foreach @{$diff->{alter}};
            }
            if ($diff->{drop}) {
                push @stmt, $driver->drop_column($class, $_->{name})
                    foreach @{$diff->{drop}};
            }
        }
        if (@stmt) {
            $driver->sql(\@stmt) or return $app->error($driver->errstr);
        }
    }
    return $diff;
}

Call it by passing it your MT::Object subclass like so

$app->repair_class('MT::Foo');
$app->repair_class('MT::Bar');

You will, of course, need to create the interface to display the results of this routine. This thread on mt-dev provides more information on using this routine.

To see an example of this routine in use, download MediaManager 1.08 (the version compatible with Movable Type 3.2). This code can be found in MediaManager::Install (plugins/MediaManager/lib/MediaManager/Install.pm)