Created
January 30, 2014 19:41
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Collect field name stats over all documents in a collection
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| map = function () { | |
| totalDocs++; | |
| var C = function(node, prefix) { | |
| for (var inner_prop in node) { | |
| if (typeof node[inner_prop] == 'object') { | |
| emit(prefix + "." + inner_prop, 1); | |
| result = C(node[inner_prop], prop + "." + inner_prop); | |
| } | |
| else if (node.hasOwnProperty(inner_prop) && inner_prop != 'str'){ | |
| emit(prefix + "." + inner_prop, 1); | |
| } | |
| } | |
| } | |
| for (var prop in this) { | |
| emit(prop,1); | |
| if (typeof this[prop] == 'object') { | |
| result = C(this[prop], prop); | |
| } | |
| } | |
| } | |
| reduce = function (key, values) { | |
| var total = 0; | |
| values.forEach(function (value) { total += value; }); | |
| return total; | |
| } | |
| finalize = function(key, values){ | |
| var stats = { totalOccurances: 0, percentCollection: 0, totalDocs: 0}; | |
| try { | |
| stats.totalOccurances = values; | |
| stats.percentCollection = Math.round((values / totalDocs) * 100) + "%"; | |
| stats.totalDocs = totalDocs; | |
| } | |
| catch(err) | |
| { | |
| stats.totalOccurances = 1; | |
| stats.percentCollection = Math.round((1 / totalDocs) * 100) + "%"; | |
| stats.totalDocs = totalDocs; | |
| } | |
| return stats; | |
| } | |
| db.tweets.mapReduce( map , reduce , { out : { inline : true }, scope : { totalDocs: 0 }, finalize: finalize } ) |
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