code: func (s RethinkStore) BatchUpdate(ids []interface{}, data []interface{}, store string, opts ObjectStoreOptions) (err error) {
  
  	_, err = r.DB(s.Database).Table(store).GetAll(ids...).Update(func(row r.Term) interface{} {
  		lenArgs := len(ids) * 2
  		args := make([]interface{}, lenArgs+1)
  		for k, v := range ids {
  			first := k * 2
  			second := first + 1
  			args[first] = row.Field("id").Eq(v.(string))
  			args[second] = data[k]
  		}
  		args[lenArgs] = nil
  		return r.Branch(args...)
  	}, r.UpdateOpts{Durability: "hard"}).RunWrite(s.Session)
  	// if res.Updated < len(ids) {
  	// 	err = ErrNotAllDeleted
  	// }
  	return
  }
docs: //BatchUpdate updates multiple rows by id