https://github.com/panter/aoz-003/blob/8da5700b93bf96c6397172e4bcd567d2f5610bee/app/models/volunteer.rb#L274 to https://github.com/panter/aoz-003/blob/8da5700b93bf96c6397172e4bcd567d2f5610bee/app/models/volunteer.rb#L284