Chris@909: class AddEnumerationsPosition < ActiveRecord::Migration
Chris@909:   def self.up
Chris@909:     add_column(:enumerations, :position, :integer, :default => 1) unless Enumeration.column_names.include?('position')
Chris@909:     Enumeration.find(:all).group_by(&:opt).each do |opt, enums|
Chris@909:       enums.each_with_index do |enum, i|
Chris@909:         # do not call model callbacks
Chris@909:         Enumeration.update_all "position = #{i+1}", {:id => enum.id}
Chris@909:       end
Chris@909:     end
Chris@909:   end
Chris@909: 
Chris@909:   def self.down
Chris@909:     remove_column :enumerations, :position
Chris@909:   end
Chris@909: end