NAME

Jifty::Upgrade - Superclass for schema/data upgrades to Jifty applications

SYNOPSIS

package MyApp::Upgrade;use base qw/ Jifty::Upgrade /;use Jifty::Upgrade qw/ since rename /;since '0.7.4' => sub {    # Rename a column    rename table => 'cthulus', name => 'description',                                  to => 'mind_numbingly_horrible_word_picture';};since '0.6.1' => sub {    my @sizes       = ('Huge', 'Gigantic', 'Monstrous', 'Really Big');    my @appearances = ('Horrible', 'Disgusting', 'Frightening', 'Evil');        # populate new columns with some random stuff    my $cthulus = MyApp::Model::CthuluCollection->new;    while (my $cthulu = $cthulus->next) {        $cthulu->set_size($sizes[ int(rand(@sizes)) ]);        $cthulu->set_appearance($appearances[ int(rand(@appearances)) ]);    }};

DESCRIPTION

Jifty::Upgrade is an abstract base class to use to customize schema and data upgrades that happen.

sinceVERSIONSUB

since is meant to be called by subclasses ofJifty::Upgrade. Calling it signifies thatSUB should be run when upgrading to versionVERSION, after tables and columns are added, but before tables and columns are removed. If multiple subroutines are given for the same version, they are run in order that they were set up.

versions

Returns the list of versions that have been registered; this is called by theJifty::Script::Schema tool to determine what to do while upgrading.

upgrade_toVERSION

Runs the subroutine that has been registered for the given version; if no subroutine was registered, returns a no-op subroutine.

rename table => CLASS, [column => COLUMN,] to => NAME

Used in upgrade subroutines, this executes the necessary SQL to rename the table, or column in the table, to a new name.

SEE ALSO

Jifty::Manual::Upgrading