This is a CRUD resolver for a product written in GraphQL

resolvers.js

const Product = require('../models/product');

module.exports = {
  /**
   * CREATE PRODUCT - 
   * @param { name, description, price, discount} ProductInput
   * @returns Product
   * 
   * @mutation 
   * mutation {
      createProduct(productInput: { name: "Test Product 1",description: "Test Product",price: 7000.50,discount: 10}){
          _id,
          name,
          description,
          price,
          discount,
          created_at,
          updated_at
      }
     }
   */
  createProduct: async function ({ productInput }) {
    const product = new Product({
      name: productInput.name,
      description: productInput.description,
      price: productInput.price,
      discount: productInput.discount,
    });
    const createdProduct = await product.save();
    return {
      ...createdProduct._doc,
      _id: createdProduct._id.toString(),
    };
  },

  /**
   * READ: QUERY PRODUCT - 
   * @returns Product 
   * { name, description, price, discount, created_at, updated_at}
   * @query
   * 
     {
      products{products{_id, description, price, discount,created_at,updated_at}}
     }

   */
  products: async function () {
    const products = await Product.find();
    return {
      products: products.map((q) => {
        return {
          ...q._doc,
          _id: q._id.toString(),
        };
      })
    };
  },

  /**
   * UPDATE PRODUCT - 
   * @param {id}, { name, description, price, discount} ID,ProductInput
   * @returns Product
   * 
   * @mutation 
   * mutation {
      updateProduct(id:"605497bce3ad5c614f21c292",productInput: { name: "Test Product 2",description: "Test Product",price: 7500.50,discount: 8}){
          _id,
          name,
          description,
          price,
          discount,
          created_at,
          updated_at
      }
      }
   */
  updateProduct: async function ({ id, productInput }) {
    const product = await Product.findById(id);
    if (!product) {
      throw new Error('Product Not found!');
    }
    product.name = productInput.name;
    product.description = productInput.description;
    product.price = productInput.price;
    product.discount = productInput.discount;

    const updatedProduct = await product.save();
    return {
      ...updatedProduct._doc,
      _id: updatedProduct._id.toString(),
    };
  },

  /**
   * DELETE PRODUCT - 
   * @param {id} ID
   * @returns Product
   * 
   * @mutation 
   * mutation {
      deleteProduct(id:"605497bce3ad5c614f21c292"){
          _id,
          name,
          description,
          price,
          discount,
          created_at,
          updated_at
      }
     }

   */
  deleteProduct: async function ({ id, productInput }) {
    const product = await Product.findById(id);
    if (!product) {
      throw new Error('Product Not found!');
    }
    await Product.findByIdAndRemove(id);
    return {
      ...product._doc,
      _id: product._id.toString(),
    };
  },
};