view db/migrate/20090406161854_add_parent_id_to_enumerations.rb @ 332:e665cc1fdf07 cannam-pre-20110113-merge

As previous commit, but for project table (rather than "my" project list)

class AddParentIdToEnumerations < ActiveRecord::Migration
  def self.up
    add_column :enumerations, :parent_id, :integer, :null => true, :default => nil
  end

  def self.down
    remove_column :enumerations, :parent_id
  end
end