def fetch_watcher_user_ids
          (self.watcher_user_ids || []) | (AtribuicaoAutomatica.find_by_issue(self)
                                        .where(redistribute: :watcher)
                                        .map(&:group)
                                        .map(&:users)
                                        .map{|us| us.select{|u| u.active?}}
                                        .map { |us| us.map(&:id) }.inject(&:concat) || [])
        end