view db/migrate/20090406161854_add_parent_id_to_enumerations.rb @ 46:9c8afcb2f7e5 luisf

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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