这段代码报错var queryAll = user_model.find();，不知道这段代码错在哪儿，麻烦有经验的人帮忙看哈，

// login action

const  express = require('express');
var mongoose = require('mongoose');

var User_Model = mongoose.model('User_Model');

const router = express.Router();

router.get('/',(req,res,next)=>{
    res.render('login.html');
});

module.exports=router;



router.post('/',(req,resp,next)=>{

    debugger;
    //连接数据库
    mongoose.connect('mongodb://127.0.0.1:27017/likeread',(err)=>{
        if(err)
            console.log('err');
    });

    console.log(mongoose);

    var user_model = new User_Model();

    debugger;
    //查找数据
    var queryAll = user_model.find({});

    queryAll.exec((err,result)=>{
        if(err){
            console.log(err);
        }else{
            console.log(result);
        }
    });


    debugger;
    user_model.close((err,res)=>{
        if(err){
            console.log(err);
        }
    });

    debugger;

    resp.end();
});