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node_modules/mongoose/examples/lean/lean.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) {
+    
+    // lean queries return just plain javascript objects, not
+    // MongooseDocuments. This makes them good for high performance read
+    // situations
+    
+    // when using .lean() the default is true, but you can explicitly set the
+    // value by passing in a boolean value. IE. .lean(false)
+    var q = Person.find({ age : { $lt : 1000 }}).sort('age').limit(2).lean();
+    q.exec(function (err, results) {
+      if (err) throw err;
+      console.log("Are the results MongooseDocuments?: %s", results[0] instanceof mongoose.Document);
+
+      console.log(results);
+      cleanup();
+    });
+  });
+});
+
+function cleanup() {
+  Person.remove(function() {
+    mongoose.disconnect();
+  });
+}