Find or Create Mongool.js

  db().open(function (db) {
    db.collection('users', function(err, collection) {
      collection.findOne({'username': self.params.get.username}, function (err, result) {
        if(!result) {
          var newUser = new User(self.params.get.username)
          collection.insert([newUser.toJSON()], function(docs) {
            db.close();
            puts("Created new user: "+newUser.username)
            self.halt(200, JSON.encode(newUser))
          })
        } else {
          db.close();
          puts("Fetched existing user: "+result.username)
          self.halt(200, JSON.encode(result))
        }

      })
    })
  })