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node_modules/mongoose/examples/aggregate/aggregate.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",
+    likes : ['movies', 'games', 'dogs']},
+  { name : 'mary', age : 30, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 30)), gender : "Female",
+    likes : ['movies', 'birds', 'cats']},
+  { name : 'bob', age : 21, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 21)), gender : "Male",
+    likes : ['tv', 'games', 'rabbits']},
+  { name : 'lilly', age : 26, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 26)), gender : "Female",
+    likes : ['books', 'cats', 'dogs']},
+  { name : 'alucard', age : 1000, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 1000)), gender : "Male",
+    likes : ['glasses', 'wine', 'the night']},
+];
+
+
+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) {
+    
+    // run an aggregate query that will get all of the people who like a given
+    // item. To see the full documentation on ways to use the aggregate
+    // framework, see http://docs.mongodb.org/manual/core/aggregation/
+    Person.aggregate(
+      // select the fields we want to deal with
+      { $project : { name : 1, likes : 1 } },
+      // unwind 'likes', which will create a document for each like
+      { $unwind : "$likes" },
+      // group everything by the like and then add each name with that like to
+      // the set for the like
+      { $group : {
+        _id : { likes : "$likes" },
+        likers : { $addToSet : "$name" }
+      } },
+      function (err, result) {
+        if (err) throw err;
+        console.log(result);
+        //[ { _id: { likes: 'the night' }, likers: [ 'alucard' ] },
+        //{ _id: { likes: 'wine' }, likers: [ 'alucard' ] },
+        //{ _id: { likes: 'books' }, likers: [ 'lilly' ] },
+        //{ _id: { likes: 'glasses' }, likers: [ 'alucard' ] },
+        //{ _id: { likes: 'birds' }, likers: [ 'mary' ] },
+        //{ _id: { likes: 'rabbits' }, likers: [ 'bob' ] },
+        //{ _id: { likes: 'cats' }, likers: [ 'lilly', 'mary' ] },
+        //{ _id: { likes: 'dogs' }, likers: [ 'lilly', 'bill' ] },
+        //{ _id: { likes: 'tv' }, likers: [ 'bob' ] },
+        //{ _id: { likes: 'games' }, likers: [ 'bob', 'bill' ] },
+        //{ _id: { likes: 'movies' }, likers: [ 'mary', 'bill' ] } ]
+
+        cleanup();
+    });
+  });
+});
+
+function cleanup() {
+  Person.remove(function() {
+    mongoose.disconnect();
+  });
+}