code: func (t *RacksTable) ids(c context.Context) map[string]int64 {
  	racks := make(map[string]int64, len(t.current))
  	for _, rack := range t.current {
  		racks[rack.Name] = rack.Id
  	}
  	return racks
  }
docs: // ids returns a map of rack names to IDs.