Product controller

product_controller.js

const Product = require('./product_model');

module.exports = {
  getProducts: async (req, res, next) => {
    Product.find({}).exec((error, result) => {
      if (error) {
        return next(error);
      }

      if (result) {
        if (result.length > 0) {
          res.status(200).json({ status: 'SUCCESS', products: result });
        } else {
          res.status(200).json({ status: 'NO_PRODUCTS' });
        }
      }
    });
  },

  getProduct: async (req, res, next) => {
    let productId = req.params.productId;

    Product.findById(productId, (error, result) => {
      if (error) {
        return next(error);
      }

      if (result) {
        res.status(200).json({ status: 'SUCCESS', product: result });
      } else
      {
        return res.json( { status: 'FAILED', message: 'Product not found' } );
      }
    });
  },

  addProduct: async (req, res, next) => {
    let { name, quantity, cost_price, sale_price } = req.body;

    let product = new Product({
      name,
      quantity,
      cost_price,
      sale_price,
    });

    product.save((error, result) => {
      if (error) {
        return next(error);
      }

      if (result) {
        return res.json({
          status: 'SUCCESS',
          message: 'Product added successfully',
        });
      } else
      {
        return res.json( {
          status: 'FAILED',
          message: 'Unable to add product'
        } );
      }
    });
  },

  updateProduct: async (req, res, next) => {
    let productId = req.params.productId;

    let { name, quantity, cost_price, sale_price } = req.body;

    Product.findOneAndUpdate(
      { _id: productId },
      { name, quantity, cost_price, sale_price }
    ).exec((error, result) => {
      if (error) {
        return next(error);
      }

      if (result) {
        return res.json({
          status: 'SUCCESS',
          message: 'Product updated successfully',
        });
      } else
      {
        return res.json( {
          status: 'FAILED',
          message: 'Product not updated'
        })
      }
    });
  },

  deleteProduct: async (req, res, next) => {
    let productId = req.params.productId;

    Product.findOneAndDelete({ _id: productId }, (error, result) => {
      if (error) {
        return next(error);
      }

      if (result) {
        return res.json({
          status: 'SUCCESS',
          messgae: 'Product deleted successfully',
        });
      }
    });
  },
};