min, max date in group

group.coffee

#mongo dev/node/tourism/Parsers/_intel/group.js

print "go..."

grps = db.tour.group
  key:
    dom : true
    country : true
  initial:
    cnt: 0
    min : ''
    max : ''
  reduce: (doc, out) ->
    if !out.min or out.min > doc.checkin then out.min = doc.checkin
    if !out.max or out.max < doc.checkin then out.max = doc.checkin
    out.cnt++

printjson g for g in grps