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Product.Controller.js

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const createError = require('http-errors');

const mongoose = require('mongoose');

const Product = require('../Models/Product.model');

module.exports = {

getAllProducts: async (req, res, next) => {

try {

const results = await Product.find({}, { __v: 0 });

// const results = await Product.find({}, { name: 1, price: 1, _id: 0 });

// const results = await Product.find({ price: 699 }, {});

res.send(results);

} catch (error) {

console.log(error.message);

}

},

createNewProduct: async (req, res, next) => {

try {

const product = new Product(req.body);

const result = await product.save();

res.send(result);

} catch (error) {

console.log(error.message);

if (error.name === 'ValidationError') {

next(createError(422, error.message));

return;

}

next(error);

}

/*Or:

If you want to use the Promise based approach*/

/*

const product = new Product({

name: req.body.name,

price: req.body.price

});

product

.save()

.then(result => {

console.log(result);

res.send(result);

})

.catch(err => {

console.log(err.message);

});

*/

},

findProductById: async (req, res, next) => {

const id = req.params.id;

try {

const product = await Product.findById(id);

// const product = await Product.findOne({ _id: id });

if (!product) {

throw createError(404, 'Product does not exist.');

}

res.send(product);

} catch (error) {

console.log(error.message);

if (error instanceof mongoose.CastError) {

next(createError(400, 'Invalid Product id'));

return;

}

next(error);

}

},

updateAProduct: async (req, res, next) => {

try {

const id = req.params.id;

const updates = req.body;

const options = { new: true };

const result = await Product.findByIdAndUpdate(id, updates, options);

if (!result) {

throw createError(404, 'Product does not exist');

}

res.send(result);

} catch (error) {

console.log(error.message);

if (error instanceof mongoose.CastError) {

return next(createError(400, 'Invalid Product Id'));

}

next(error);

}

},

deleteAProduct: async (req, res, next) => {

const id = req.params.id;

try {

const result = await Product.findByIdAndDelete(id);

// console.log(result);

if (!result) {

throw createError(404, 'Product does not exist.');

}

res.send(result);

} catch (error) {

console.log(error.message);

if (error instanceof mongoose.CastError) {

next(createError(400, 'Invalid Product id'));

return;

}

next(error);

}

}

};