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LEARN ABOUT DEBIAN

jifty::upgrade

Jifty::Upgrade(3pm)					User Contributed Perl Documentation				       Jifty::Upgrade(3pm)

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.

   since VERSION SUB
       "since" is meant to be called by subclasses of "Jifty::Upgrade".  Calling it signifies that SUB should be run when upgrading to version
       VERSION, 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 the Jifty::Script::Schema tool to determine what to do while
       upgrading.

   upgrade_to VERSION
       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

perl v5.14.2							    2010-12-08						       Jifty::Upgrade(3pm)

UNIX for Dummies Questions & Answers