Merge pull request #80 from BiswajitSahoo-tech/inv-mgmt

Added inventory management

backend/controllers/orderControllers.js

@@ -1,6 +1,7 @@
 const asyncHandler = require('express-async-handler')
 const Order = require('../models/orderModel')
 const Product = require('../models/productModel')
+const productController = require('./../controllers/productController')
 
 // @desc    Create new order
 // @route   POST /api/orders
@@ -17,7 +18,7 @@ const addOrderItems = asyncHandler(async (req, res) => {
   // Product price validation
   orderItems.forEach(async (item) => {
     let lookupItem = await Product.findById(item.product)
-    if (item.price !== lookupItem.price) {
+    if (parseFloat(item.price) !== lookupItem.price) {
       res.status(400)
       throw new Error(
         'There is a discrepancy between the prices of the items, and whats in the Database, please try again!',
@@ -91,6 +92,25 @@ const updateOrderToPaid = asyncHandler(async (req, res) => {
   const order = await Order.findById(req.params.id)
 
   if (order) {
+    //below .map() function return an array of promises
+    const updatePromises = order.orderItems.map(async (item) => {
+      await productController.updateStockCount(
+        req,
+        res,
+        item.product,
+        parseInt(item.qty),
+      )
+    })
+    //below function to resolve the array of promises
+    try {
+      await Promise.all(updatePromises)
+    } catch (error) {
+      return res.status(404).json({
+        status: 'fail',
+        message: error.message,
+      })
+    }
+
     order.isPaid = true
     order.paidAt = Date.now()
     const updatedOrder = await order.save()

backend/controllers/productController.js

@@ -127,10 +127,33 @@ const updateProduct = asyncHandler(async (req, res) => {
   }
 })
 
+const updateStockCount = asyncHandler(async (req, res, id, qty) => {
+  try {
+    var product = await Product.findById(id)
+  } catch (err) {
+    throw new Error(err.message)
+  }
+
+  if (product.countInStock < qty) {
+    throw new Error(
+      'We are really sorry. We have not ' +
+        qty +
+        ' amount of ' +
+        product.name +
+        ' currently on stock. Either you wait for stock to fullfilled or you can decrease your ordered quantity of ' +
+        product.name,
+    )
+  }
+  product.countInStock -= qty
+  const updatedProduct = await product.save()
+  return updateProduct
+})
+
 module.exports = {
   getProducts,
   getProductById,
   deleteProduct,
   createProduct,
   updateProduct,
+  updateStockCount,
 }