关于schema。。我都干了些什么 = =

schema声明

var Schema = mongoose.Schema;
var ObjectId = Schema.ObjectId;

var User = new Schema({
	username : String ,
	password: String
});
var User = mongoose.model('User',User);

注册功能 输入的用户名是eee 密码是eee

//注册
app.post('/doregister',function(req,res){
	console.log(req.body.user);// 输出{username:'eee',password:'eee'}
	User.find({username:req.body.user.username},function(err,doc){
		console.log(doc);
		if (doc=[]){
			console.log('can');//输出can
			var user = new User(req.body.user);
			user.save(function(err){
				if(!err){
					console.log('register success!');
					console.log('user:'+req.body.user);//user [Object Object]
					res.redirect('/index');
				}else{
					res.redirect('/register');
				}
			});
		}else{
			console.log('can t');
			res.redirect('/register');
		}
	});
});

用eee & eee登陆的时候

app.post('/dologin',function(req,res){
	User.find({username:req.body.user.username},function(err,doc){
		if(doc.password = req.body.user.password){
			console.log("登陆成功");
			req.session.user = doc;
			console.log(req.session.user);// 就是这个特别奇葩 输出是[{ _id:***********,username:'eee',password:'eee',__v:'0'},password:'eee']
			res.redirect('/');
		}else{
			res.redirect('/login');
		}
		console.log(req.session.user.username);//undefined
		console.log(req.session.user.password);//eee
	});
});

what?!!why?!!