add_autosave_association_callbacks

# File activerecord/lib/active_record/autosave_association.rb, line 167
      def add_autosave_association_callbacks(reflection)
        save_method = "autosave_associated_records_for_#{reflection.name}""autosave_associated_records_for_#{reflection.name}"
        validation_method = "validate_associated_records_for_#{reflection.name}""validate_associated_records_for_#{reflection.name}"
        collection = reflection.collection?

        unless method_defined?(save_method)
          if collection
            before_save :before_save_collection_association

            define_method(save_method) { save_collection_association(reflection) }
            # Doesn't use after_save as that would save associations added in after_create/after_update twice
            after_create save_method
            after_update save_method
          else
            if reflection.macro == :has_one
              define_method(save_method) { save_has_one_association(reflection) }
              after_save save_method
            else
              define_method(save_method) { save_belongs_to_association(reflection) }
              before_save save_method
            end
          end
        end

        if reflection.validate? && !method_defined?(validation_method)
          method = (collection ? :validate_collection_association : :validate_single_association)
          define_method(validation_method) { send(method, reflection) }
          validate validation_method
        end
      end