Unable to get documents when I use ES6 in my node js - mongodb

Question

I'm working on MEAN stack to create some web services.
I thought of using ES6 for synchronizing mongodb find operations.
Here is the code(UserService):
var Todo = require('../models/user.js');
var db = mongoose.createConnection('mongodb://localhost:27017/abc');
var Users = db.model('User');
function *myGenerator() {
return yield Todo.find({});//Throwing Undefined function Todo.find
//return yield Users.find({}); //DOes not returns documents but returns a json object which has full mongodb database details
}
function getDocs(){
var iterator = myGenerator();
var firstYield = iterator.next();
}
return yield Todo.find({}) is throwing exception Undefined function Todo.find
return yield Users.find({}); does not return documents but returns a JSON object which has full mongodb database details
return yield Users.find({}).exec() returns following output
{ value:
Promise {
emitter:
EventEmitter {
domain: null,
_events: {},
_eventsCount: 0,
_maxListeners: undefined },
emitted: {},
ended: false },
done: false }
PS: I used --harmony node js option as well.
Could you please help me to get User rows/documents?

Answer 1

Todo.find({}); returns a Query object. You must call exec function on that object to execute the query. e.g.
Todo.find({}).exec(function (error, docs) {
if (error) {
// handle
}
if (docs) {
// yeah !!!
}
})
Also mongoose database connection is asynchronous. So any queries made before the connection is established obviously wont work. Here's a working example..
var mongoose = require('mongoose');
mongoose.Promise = Promise;
var db = mongoose.connect('mongodb://localhost:27017/test', (error) => {
if (error) {
throw error
}
console.log('DB Connected');
var Todo = require('./models/user.js');
var Users = db.model('User');
function *myGenerator() {
yield Todo.find({}); // Returns a Query object
//yield Users.find({}); // Returns a Query object
}
function getDocs(){
var iterator = myGenerator();
var firstYield = iterator.next();
// firstYield is a `Query` object
firstYield.value.exec((error, users) => {
if (error) {
throw error;
}
console.log(users);
})
}
getDocs();
});

Answer 2

var Todo = requires('models/user.js'); produces ReferenceError: requires is not defined
should be var Todo = require('models/user.js');
maybe even
var Todo = require('./models/user.js'); because 'models/user.js' is relative to the node_modules directory
return yield Todo.find({});
should be yield Todo.find({});
As far as I can see this code will throw an Exception.
Please provide the actual code and some more info like what version of node.js you are currently running ?
p.S I wrote this in the answers section because I have yet to earned the comment everywhere priveledge