MongoDB group by hour

Question

I save tweets to mongo DB:

 twit.stream(\'statuses/filter\', {\'track\': [\'animal\']}, function(stream) {
    stream.on(\'data\', function(data) {
        c         


        

Answer 1

I could tell you how you can group using aggregation framework directly on mongo console

db.tweets.aggregate(
 { "$project": {
      "y":{"$year":"$created_at"},
      "m":{"$month":"$created_at"},
      "d":{"$dayOfMonth":"$created_at"},
      "h":{"$hour":"$created_at"},
      "tweet":1 }
 },
 { "$group":{ 
       "_id": { "year":"$y","month":"$m","day":"$d","hour":"$h"},
       "total":{ "$sum": "$tweet"}
   }
 })

For more options you can look here: http://docs.mongodb.org/manual/reference/operator/aggregation-date/

You will also need to find appropriate way of of using aggregation framework from whichever programming language you are using.