Chris@1295: class AddCustomFieldsPosition < ActiveRecord::Migration
Chris@1295:   def self.up
Chris@1295:     add_column(:custom_fields, :position, :integer, :default => 1)
Chris@1295:     CustomField.all.group_by(&:type).each  do |t, fields|
Chris@1295:       fields.each_with_index do |field, i|
Chris@1295:         # do not call model callbacks
Chris@1295:         CustomField.update_all "position = #{i+1}", {:id => field.id}
Chris@1295:       end
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   def self.down
Chris@1295:     remove_column :custom_fields, :position
Chris@1295:   end
Chris@1295: end