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             072_add_enumerations_position.rb
        
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             / db / migrate / 072_add_enumerations_position.rb
          
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      class AddEnumerationsPosition < ActiveRecord::Migration

        def self.up

          add_column(:enumerations, :position, :integer, :default => 1) unless Enumeration.column_names.include?('position')

          Enumeration.find(:all).group_by(&:opt).each_value  do |enums|

            enums.each_with_index do |enum, i|

              # do not call model callbacks

              Enumeration.update_all "position = #{i+1}", {:id => enum.id}

            end

          end

        end

        def self.down

          remove_column :enumerations, :position

        end

      end

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

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