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node_modules/mongoose/examples/querybuilder/querybuilder.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)) },
+  { name : 'mary', age : 30, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 30)) },
+  { name : 'bob', age : 21, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 21)) },
+  { name : 'lilly', age : 26, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 26)) },
+  { name : 'alucard', age : 1000, birthday : new Date().setFullYear((new
+    Date().getFullYear() - 1000)) },
+];
+
+
+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) throw err;
+
+    // when querying data, instead of providing a callback, you can instead
+    // leave that off and get a query object returned
+    var query = Person.find({ age : { $lt : 1000 }});
+
+    // this allows you to continue applying modifiers to it
+    query.sort('birthday');
+    query.select('name');
+    
+    // you can chain them together as well
+    // a full list of methods can be found:
+    // http://mongoosejs.com/docs/api.html#query-js
+    query.where('age').gt(21);
+
+    // finally, when ready to execute the query, call the exec() function
+    query.exec(function (err, results) {
+      if (err) throw err;
+
+      console.log(results);
+
+      cleanup();
+    });
+    
+  });
+});
+
+function cleanup() {
+  Person.remove(function() {
+    mongoose.disconnect();
+  });
+}