Importing img Url from MongoDB using Mongoose doesn't work

Question

I'm trying to import img url from my database (mongodb) using mongoose, and display it with EJS, my problem is that I always get undefined.

The data I get when using findById is "item" =

[ 
    { 
        _id: 5b809b2c74e2f54c20ae30da,
        brand: 'honda',
        model: 'cbr250r',
        price: 20000,
        amount: 20,
        img: 'https://news.maxabout.com/wp-content/uploads/2016/12/22.png',
        backImg: 'https://wallpapercave.com/wp/wp3065342.png',
        views: 1,
        desc: 'this is a bike description' 
    } 
]

and I'm trying getting my "backImg" using this path: "item[0].backImg". When I console.log it I get undefined. I also tried "item.backImg"

that's the route file which includes the function:

const router = require('express').Router();
const bodyParser=require('body-parser')
const urlencodedParser =bodyParser.urlencoded({extended:false})
router.use(bodyParser.json());
router.use(bodyParser.urlencoded({ extended: true }));
const itemModel = require('../models/itemsModel')
const userModel = require('../models/userModel')

//items//
router.get('/:_id',(req,res)=>{
    console.log(req.params._id)
    let q = itemModel.find({_id:req.params._id})
    q.exec(function(err,item){
        if(err){
            console.log(err)
        } else {
            console.log(item)
            console.log(item[0].brand)
            console.log(item[0].backImg)
            console.log(item.backImg)
            res.render('./pages/items' , {item:item,user: req.user,} )
        }
    })
})

module.exports = router

Answer 1

I think it should be like this

..... // previous code
itemModel.findOne({_id:req.params._id})
.then((item)=>{
    if(!item){
        console.log("No record found");
    }
    console.log(item)
    console.log(item.brand)
    console.log(item.backImg)
})
.catch(err=>{
    console.log("Error",err)
})

Here you can see I have used the findOne method of mongoose that will give only 1 result (single object) from database.Also check if req.params._id is not undefined .If you have any queries let me know.

Answer 2

所以它似乎那些作为 undefiend 导入的字段没有添加到项目架构中，所以这就是问题所在