Expressjs multer middleware save file in dynamic destination - node.js

Question

I am using multer with expressjs and I am trying to change the DIR to save images depending on the request to a dynamic destination, my code is working fine but always save images inside the post directory, I'm using this middleware with multi requests.
1- How can I make the directory dynamic! example: to save to ./public/products if req product & save to ./public/posts if req post
2- How to make sure that the file is uploaded to the directory with no errors in the controller! then save the path to the database!
3- Is this the best practice to use multer ! in middleware level!
multer middleware fileUpload.js
const multer = require("multer");
const mkdirp = require("mkdirp");
const fs = require("fs");
const getDirImage = () => {
// const DIR = './public/uploads/products';
return `./public/posts`;
};
let storage = multer.diskStorage({
destination: (req, file, cb) => {
console.log(req.params,'&&&&&&&&&&&&',file);
let DIR = getDirImage();
if (!fs.existsSync(DIR)) {
fs.mkdirSync(DIR, { recursive: true });
}
cb(null, DIR);
},
filename: (req, file, cb) => {
const fileName = "overDress" + Date.now() + "" +
file.originalname.toLowerCase().split(' ').join('-');
cb(null, fileName)
},
});
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 10 //upto 2 megabytes per file.
},
fileFilter: (req, file, cb) => {
if (file.mimetype == "image/png" || file.mimetype == "image/jpg" ||
file.mimetype == "image/jpeg") {
cb(null, true);
} else {
cb(null, false);
return cb(new Error('File types allowed .jpeg, .jpg and .png!'));
}
}
});
module.exports = upload;
product.js route
const controller = require('../controllers/product.controller');
import { Router } from 'express'; //import from esm
import upload from '../middleware/fileUpload'
const router = Router();
router
.get('/', controller.list)
.post('/', upload.single('image'), controller.create)
.get('/:id', controller.getOne)
export default router;
and my create controller:
exports.create = async (req, res, next) => {
const { name, title, description,subtitle} = req.body;
if (!name || !title) {
return res.status(400).send({
message: 'Please provide a title and a name to create a product!',
});
}
try {
if (req.file) {
req.body.image = req.file.destination + '/' + req.file.filename;
}
const PRODUCT_MODEL = {
name: req.body.name,
title: req.body.title,
description: req.body.description,
image: req.body.image,
};
try {
const product = await Product.create(PRODUCT_MODEL);
console.log('product crerated');
return res.status(201).json(product);
} catch (error) {
console.log(error);
return res.status(500).send({
message: 'Something went wrong: ' + error,
});
}
} catch (error) {
return res.status(500).json(error);
}
};