Node.js 奇怪的问题，模型。在猫鼬中发现未定义

我的模型是

user.js

db helper类db.js

我在sails js控制器中使用这个

var db = require('../services/db.js');

module.exports = {
    save : function(req,res){
        var user = db.User({
            name: "govind",
            emailAddress: "govind@govind.com",
            isActive : true
        });
        user.save(function(){
            res.json({"response" : "successfully saved sample data"});
        });

    },
    get : function(req,res){
        console.log(db.User.find);    //this print undefined
        db.User.find(function (err, s) {
            res.json({"response" : s});
        });
    }
};

---

当我调用save controller时，工作正常，但当我在控制台中调用get it throw exception时，在调用db.User.find的同一行中，我也会在控制台中记录find方法，这也会打印undefined。我使用的是猫鼬版本4.0.1

是不是应该像console.logdb.User.find这样；我使用了“console.logdb.User.find；”检查是否定义了“.find”

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/MyDatabase');
var db = mongoose.connection;

console.log('Try to connect to MongoDB via Mongoose ...');

db.on('error', console.error.bind(console, 'Mongoose connection error:'));
db.once('open', function callback() {
    console.log('Connected to MongoDB !');
});

module.exports = {
    User: require('../models/user.js')(mongoose),
}

var db = require('../services/db.js');

module.exports = {
    save : function(req,res){
        var user = db.User({
            name: "govind",
            emailAddress: "govind@govind.com",
            isActive : true
        });
        user.save(function(){
            res.json({"response" : "successfully saved sample data"});
        });

    },
    get : function(req,res){
        console.log(db.User.find);    //this print undefined
        db.User.find(function (err, s) {
            res.json({"response" : s});
        });
    }
};