class ChangeProductUpgradesRelationships < ActiveRecord::Migration
  def self.up
    change_table :product_upgrades do |t|
      t.remove    :product_id
      t.integer   :upgradable_id, :references => nil
      t.integer   :upgradable_to_id, :references => nil
      t.string    :upgradable_type, :default => 'ProductEdition'
      t.string    :upgradable_to_type
    end
    ProductUpgrade.update_all(["upgradable_id = product_edition_id"])
    remove_column :product_upgrades, :product_edition_id
  end

  def self.down
  end
end