Updated mongoose

node_modules/mongoose/examples/mapreduce/mapreduce.js

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+// import async to make control flow simplier
+var async = require('async');
+
+// import the rest of the normal stuff
+var mongoose = require('../../lib');
+
+require('./person.js')();
+
+var Person = mongoose.model('Person');
+
+// define some dummy data
+var data = [
+    {
+      name: 'bill',
+      age: 25,
+      birthday: new Date().setFullYear((new Date().getFullYear() - 25)),
+      gender : "Male"
+    },
+    {
+      name: 'mary',
+      age: 30,
+      birthday: new Date().setFullYear((new Date().getFullYear() - 30)),
+      gender: "Female"
+    },
+    {
+      name: 'bob',
+      age: 21,
+      birthday : new Date().setFullYear((new Date().getFullYear() - 21)),
+      gender: "Male"
+    },
+    {
+      name: 'lilly',
+      age: 26,
+      birthday: new Date().setFullYear((new Date().getFullYear() - 26)),
+      gender: "Female"
+    },
+    {
+      name: 'alucard',
+      age: 1000,
+      birthday: new Date().setFullYear((new Date().getFullYear() - 1000)),
+      gender : "Male"
+    }
+];
+
+
+mongoose.connect('mongodb://localhost/persons', function(err) {
+  if (err) throw err;
+
+  // create all of the dummy people
+  async.each(data, function(item, cb) {
+    Person.create(item, cb);
+  }, function(err) {
+    if (err) {
+      // handle error
+    }
+
+    // alright, simple map reduce example. We will find the total ages of each
+    // gender
+
+    // create the options object
+    var o = {};
+
+    o.map = function() {
+      // in this function, 'this' refers to the current document being
+      // processed. Return the (gender, age) tuple using
+      /* global emit */
+      emit(this.gender, this.age);
+    };
+
+    // the reduce function receives the array of ages that are grouped by the
+    // id, which in this case is the gender
+    o.reduce = function(id, ages) {
+      return Array.sum(ages);
+    };
+
+    // other options that can be specified
+
+    // o.query = { age : { $lt : 1000 }}; // the query object
+    // o.limit = 3; // max number of documents
+    // o.keeptemp = true; // default is false, specifies whether to keep temp data
+    // o.finalize = someFunc; // function called after reduce
+    // o.scope = {}; // the scope variable exposed to map/reduce/finalize
+    // o.jsMode = true; // default is false, force execution to stay in JS
+    o.verbose = true; // default is false, provide stats on the job
+    // o.out = {}; // objects to specify where output goes, by default is
+                   // returned, but can also be stored in a new collection
+                   // see: http://mongoosejs.com/docs/api.html#model_Model.mapReduce
+    Person.mapReduce(o, function(err, results, stats) {
+      console.log("map reduce took %d ms", stats.processtime);
+      console.log(results);
+      cleanup();
+    });
+  });
+});
+
+function cleanup() {
+  Person.remove(function() {
+    mongoose.disconnect();
+  });
+}

node_modules/mongoose/examples/mapreduce/package.json

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+{
+  "name": "map-reduce-example",
+  "private": "true",
+  "version": "0.0.0",
+  "description": "deps for map reduce example",
+  "main": "mapreduce.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": { "async": "*" },
+  "repository": "",
+  "author": "",
+  "license": "BSD"
+}

node_modules/mongoose/examples/mapreduce/person.js

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+
+// import the necessary modules
+var mongoose = require('../../lib');
+var Schema = mongoose.Schema;
+
+// create an export function to encapsulate the model creation
+module.exports = function() {
+  // define schema
+  var PersonSchema = new Schema({
+    name : String,
+    age : Number,
+    birthday : Date,
+    gender: String
+  });
+  mongoose.model('Person', PersonSchema);
+};