I'm currently in the process of upgrading old legacy Rails app and trying to find the exact version number when this reversible.up
, reversible.down
block feature was introduced.
class SplitNameMigration < ActiveRecord::Migration
def change
add_column :users, :first_name, :string
add_column :users, :last_name, :string
reversible do |dir|
User.reset_column_information
User.all.each do |u|
dir.up { u.first_name, u.last_name = u.full_name.split(' ') }
dir.down { u.full_name = "#{u.first_name} #{u.last_name}" }
u.save
end
end
end
end
Does anyone know?
4.0.0 it was.
New method
reversible
makes it possible to specify code to be run when migrating up or down. See the Guide on Migration