diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/migration.rb | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index 365f57f366..a71e367ef2 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -108,6 +108,18 @@ module ActiveRecord # add_column :items, :completed_items_count # end # end + # + # And some times you need to do something in SQL not abstracted directly by migrations: + # + # class MakeJoinUnique < ActiveRecord::Migration + # def self.up + # execute "ALTER TABLE `pages_linked_pages` ADD UNIQUE `page_id_linked_page_id` (`page_id`,`linked_page_id`)" + # end + # + # def self.down + # execute "ALTER TABLE `pages_linked_pages` DROP INDEX `page_id_linked_page_id`" + # end + # end class Migration class << self def up() end @@ -122,6 +134,17 @@ module ActiveRecord class Migrator#:nodoc: class << self + def migrate(migrations_path, target_version = nil) + case + when target_version.nil?, current_version < target_version + up(migrations_path, target_version) + when current_version > target_version + down(migrations_path, target_version) + when current_version == target_version + return # You're on the right version + end + end + def up(migrations_path, target_version = nil) self.new(:up, migrations_path, target_version).migrate end |