def save_has_one_association(reflection)
        association = association_instance_get(reflection.name)
        record      = association && association.load_target

        if record && !record.destroyed?
          autosave = reflection.options[:autosave]

          if autosave && record.marked_for_destruction?
            record.destroy
          elsif autosave != false
            key = reflection.options[:primary_key] ? send(reflection.options[:primary_key]) : id

            if (autosave && record.changed_for_autosave?) || new_record? || record_changed?(reflection, record, key)
              unless reflection.through_reflection
                record[reflection.foreign_key] = key
                if inverse_reflection = reflection.inverse_of
                  record.association(inverse_reflection.name).loaded!
                end
              end

              saved = record.save(validate: !autosave)
              raise ActiveRecord::Rollback if !saved && autosave
              saved
            end
          end
        end
      end
def save_has_one_association(reflection)
        association = association_instance_get(reflection.name)
        record      = association && association.load_target

        if record && !record.destroyed?
          autosave = reflection.options[:autosave]

          if autosave && record.marked_for_destruction?
            record.destroy
          elsif autosave != false
            key = reflection.options[:primary_key] ? send(reflection.options[:primary_key]) : id

            if (autosave && record.changed_for_autosave?) || new_record? || record_changed?(reflection, record, key)
              unless reflection.through_reflection
                record[reflection.foreign_key] = key
                if inverse_reflection = reflection.inverse_of
                  record.association(inverse_reflection.name).loaded!
                end
              end

              saved = record.save(validate: !autosave)
              raise ActiveRecord::Rollback if !saved && autosave
              saved
            end
          end
        end
      end
Saves the associated record if it's new or <tt>:autosave</tt> is enabled
 on the association.

 In addition, it will destroy the association if it was marked for
 destruction with #mark_for_destruction.

 This all happens inside a transaction, _if_ the Transactions module is included into
 ActiveRecord::Base after the AutosaveAssociation module, which it does by default.