Uploading an image to an API with multer

I’m trying to make an application that requires image uploading and storing, I’m using Express, Mongoose and Multer and trying to upload to MongoDB.

Currently when I try to upload an image, Multer does create a folder and store the image in that folder, but it doesn’t save the item to the database and it crashes the server giving the error : ObjectParameterError: Parameter "obj" to Document() must be an object, got itemImages34ed9d34a3b034becdb415d67b7d193.

Adding to the database works fine without trying to add the image with multer.

My Code:

item_controller.js:

const Item = require('../models/item_schema');

const addItem = (req, res) => {
    let itemData = req.body
    let itemImage = req.file.path

    Item.create(itemData, itemImage)
        .then((data) => {
            if (data) {
                res.status(201).json(data)
            }
        })
}

module.exports = {
    addItem
}

item_schema.js

const { Schema, model} = require('mongoose')

const itemSchema = new Schema({
    title: {
        type: String,
        required: [true, 'Title field is required.']
    },
    description: {
        type: String,
        required: [true, 'Description field is required.']
    },
    itemImage: {
        type: String,
        required: [true, 'Image field is required.']
    },
    userID: {
        type: Schema.Types.ObjectId,
        ref: "User",
        required: [true, 'User field is required']
    },
    categoryID: {
        type: Schema.Types.ObjectId,
        ref: "Category",
        required: [true, 'Category field is required']
    },
    qualityID: {
        type: Schema.Types.ObjectId,
        ref: "Quality",
        required: [true, 'Quality field is required']
    },
    price: {
        type: Number
    },
    claimed:{
        type: Boolean
    }
}, {
    timestamps: true
})

module.exports = model('Item', itemSchema)

server.js:

const express = require('express')
const cors = require('cors')
const jwt = require('jsonwebtoken')
const multer = require('multer');
const upload = multer({dest: 'itemImages/'});

require('dotenv').config()
require('./db')()

const { addItem } = require('./controllers/item_controller')
const { loginRequired } = require('./controllers/user_controller')

const app = express()
app.use(cors())
app.use(express.json())

app.post('/items', upload.single('itemImage'), loginRequired, addItem)

app.listen(port, () => {
    console.log(`Example app listening on port ${port}`)
})

Answer

In your item_controller.js try this:

const addItem =  (req, res) => {
 let itemData = req.body
 let itemImage = req.file.path

 Item.create({
  title: itemData.title,
  description: description ,
  itemImage: itemImage ,
  userID: item.userID ,
  categoryID: item.categoryID ,
  qualityID: item.qualityID,
  //put all data that are required here...
 }, (err,, data)=> {
  if (err) return handleError(err) //here you custom handleError of Just res.status(400).json(err);

  res.status(201).json(data)
 })
}

Model.create receive as a first params all that property you want to save in your Model and second params it a closure.