def to_s
      t('permission_string', action: t(self.permission_type.to_s),
        model: t(self.model.underscore.humanize))
    end
def to_s
      t('permission_string', action: t(self.permission_type.to_s),
        model: t(self.model.underscore.humanize))
    end
alias_method :action, :permission_type