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POTwitter data - Finding the most mentioned user in MongoDB
 

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    <p>Lets say I have stream data from the Twitter API, and I have the data stored as documents in the MongoDB. What I'm trying to find is the count of <code>screen_name</code> under <code>entities.user_mentions</code>.</p> <pre><code>{ "_id" : ObjectId("50657d5844956d06fb5b36c7"), "contributors" : null, "text" : "", "entities" : { "urls" : [ ], "hashtags" : [ { "text" : "", "indices" : [ 26, 30 ] }, { "text" : "", "indices" : [] } ], "user_mentions" : [ { "name":"Twitter API", "indices":[4,15], "screen_name":"twitterapi", "id":6253282, "id_str":"6253282" }] }, ... </code></pre> <p>I have attempted to use map reduce:</p> <pre><code>map = function() { if (!this.entities.user_mentions.screen_name) { return; } for (index in this.entities.user_mentions.screen_name) { emit(this.entities.user_mentions.screen_name[index], 1); } } reduce = function(previous, current) { var count = 0; for (index in current) { count += current[index]; } return count; } result = db.runCommand({ "mapreduce" : "twitter_sample", "map" : map, "reduce" : reduce, "out" : "user_mentions" }); </code></pre> <p>But its not quite working...</p>
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