** trying to use the app.delete and trying to delete document from mondo db using delete one...it keep throwing errror. how to solve this error ? ** ``` require('dotenv').config() const express = require('express') const app = express() const PORT = process.env.PORT || 5001 const connectDB = require('./config/db') const errorHandler = require('./middleware/error') const Product =require('./models/product') const cors = require('cors')
// Connect DB connectDB() // Middleware app.use(cors()) app.use(express.json()) app.use('/auth', require('./routes/authRoutes')) app.use('/admin', require('./routes/adminRoutes')) app.use('/customer', require('./routes/customerRoutes')) app.use('/staff', require('./routes/staffMemberRoutes')) // error handler - should be *last* piece of middleware app.use(errorHandler) app.get('/all-products', (req, res) => { Product.find({}, (error, posts) => { if(error) { res.json({error: 'Unable to fetch products!'}) } else { res.json(posts) } }) }) app.post ('/add-products',(req,res) =>{ console.log("add-products has been fired") const imageurl = req.body.imageurl const title = req.body.title const description = req.body.description const rate = req.body.rate const category = req.body.category const subcategory = req.body.subcategory let product = new Product({ imageurl: imageurl, title: title, description: description, rate: rate, category: category, subcategory: subcategory, }) product.save((error) => { if(error) { res.json({error: 'Unable to save the product!'}) } else { res.json({success: true, message: 'New product Saved'}) } }) }) app.delete('/product/:productId', (req, res) => { const productId = req.params.productId Product.deleteOne({ _id: productId }, (error, result) => { if(error) { res.json({error: 'Unable to delete product'}) } else { res.json({success: true, message: 'Product deleted successfully!'}) } }) }) app.put('/update-product/:productId', (req, res) => { const productId = req.params.productId const imageurl = req.body.imageurl const title = req.body.title const description = req.body.description const rate = req.body.rate const category = req.body.category const subcategory = req.body.subcategory const updatedProduct = { imageurl: imageurl, title: title, description: description, rate: rate, category: category, subcategory: subcategory, } Product.findByIdAndUpdate(productId, updatedProduct, (error, result) => { if(error) { res.json({error: 'Unable to updated the Product'}) } else { res.json({success: true, message: 'Product updated successfully!'}) } }) }) const server = app.listen(PORT, () => { console.log(`Server running on port ${PORT}`) }) // makes giant server errors concise and simple to read process.on('unhandledRejection', (err, promise) => { console.log(`Logged Error: ${err}`) server.close(() => process.exit(1)) })``` 
