Chris@0: class AddCustomFieldsPosition < ActiveRecord::Migration
Chris@0:   def self.up
Chris@0:     add_column(:custom_fields, :position, :integer, :default => 1)
Chris@0:     CustomField.find(:all).group_by(&:type).each  do |t, fields|
Chris@0:       fields.each_with_index do |field, i|
Chris@0:         # do not call model callbacks
Chris@0:         CustomField.update_all "position = #{i+1}", {:id => field.id}
Chris@0:       end
Chris@0:     end
Chris@0:   end
Chris@0: 
Chris@0:   def self.down
Chris@0:     remove_column :custom_fields, :position
Chris@0:   end
Chris@0: end