Can not insert data into mongodalab collection - node.js

Question

I just start use Node.JS , try to connect to MongodbLab , I follow the doc http://docs.mongolab.com/#connect
but can not insert any data in my collection "team" the error keep saying TypeError: Cannot read property 'insert' of undefined , I google for 2 hrs ,Help please.
var express = require('express');
var app = express();
app.get('/', function (req, res) {
res.send('Hello World!');
});
app.listen(3000, function () {
console.log('Example app listening on port 3000!');
});
var mongoose = require('mongoose');
var uri = "mongodb://awei:RRRRR#ds061365.mongolab.com:61365/aweitest";
mongoose.createConnection(uri);
// we're connected!
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection errrrrrrrror:'));
db.once('open', function() {
});
db.team.insert({ "name" : "Awei" });
error
c:\Users\awei\WebstormProjects\untitled\app.js:22
db.team.insert({ "name" : "Awei" });
^
TypeError: Cannot read property 'insert' of undefined
at Object.<anonymous> (c:\Users\awei\WebstormProjects\untitled\app.js:22:8)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Function.Module.runMain (module.js:447:10)
at startup (node.js:140:18)
at node.js:1001:3
Process finished with exit code 1

Answer 1

From what I am seeing, you need to connect with a username and password. See this:
http://docs.mongolab.com/connecting/
under "Finding your database connection info".
In addition, MongoLab offers getting-started help for Node.js here:
http://docs.mongolab.com/languages/
Once you are actually connected to the database, you should be able to insert data to the team collection.

Answer 2

You can access a pre-existing collection without the model using the mongoose connection's db object as follows:
var uri = "mongodb://awei:RRRRR#ds061365.mongolab.com:61365/aweitest";
mongoose.connect(uri);
var conn = mongoose.connection,
db = conn.db;
conn.on('error', console.error.bind(console, 'connection errrrrrrrror:'));
conn.on('open', function() {
console.log("mongodb is connected!!");
db.collection("team", function (err, collection) {
collection.insert({ "name" : "Awei" }, function(err, result){
console.log(result);
});
});
});