module MarkAsDeletedWithName extend ActiveSupport::Concern def mark_as_deleted # get maximum length of name max_length = 100000 if lenval = self.class.validators_on(:name).detect { |v| v.is_a?(ActiveModel::Validations::LengthValidator) } max_length = lenval.options[:maximum] end # find unique deleted name # (would have been nice to use retry, but there is no general duplicate-entry exception) n = '' begin append = " \u2020" + n deleted_name = name.truncate(max_length-append.length, omission: '') + append if n.blank? n = 'A' else n.succ! end end while self.class.where(name: deleted_name).exists? # mark as deleted update_columns deleted_at: Time.now, name: deleted_name end end