pagination added to carts

Author: Chmod351

server/Controllers/shopingCartController.js

@@ -20,7 +20,7 @@ function createCart(req, res, next) {
 
 function getAll(req, res, next) {
   cartService
-    .getAll()
+    .getAll(req.query.page, req.query.size)
     .then((cart) => res.json(cart))
     .catch((error) => next(error));
 }

server/View/shopingCartView.js

@@ -1,5 +1,6 @@
 import ShoppingCart from '../Models/shopinCartModel.js';
-
+import { NotFoundError } from '../helpers/errorHandler.js';
+import userService from '../View/usersViews.js';
 const cartService = {
   createCart,
   editCart,
@@ -8,20 +9,45 @@ const cartService = {
   getAll,
 };
 
+async function findCartById(id) {
+  const cart = await ShoppingCart.findById(id);
+  if (cart) {
+    return cart;
+  } else {
+    return new NotFoundError(`Cart Not Found`);
+  }
+}
+
 async function createCart(products, userId) {
   const newCart = new ShoppingCart({ products, userId });
   return await newCart.save();
 }
 
-async function getAll() {
-  return await ShoppingCart.find();
+async function getAll(page, size) {
+  // Pagination for products
+  const actualPage = parseInt(page) || 1;
+  const pageSize = parseInt(size) || 8;
+  const skipCount = (actualPage - 1) * pageSize;
+
+  const totalCount = await ShoppingCart.countDocuments();
+  const totalPages = Math.ceil(totalCount / pageSize);
+
+  const carts = await ShoppingCart.aggregate([
+    { $sample: { size: totalCount } },
+    { $skip: skipCount },
+    { $limit: pageSize },
+  ]);
+
+  return { carts, totalPages };
 }
 
 async function getUserCart(userId) {
+  await userService.getUser(userId);
   return await ShoppingCart.findOne({ userId });
 }
 
 async function editCart(body, cartId) {
+  await findCartById(cartId);
   return await ShoppingCart.findByIdAndUpdate(
     cartId,
     {
@@ -32,6 +58,7 @@ async function editCart(body, cartId) {
 }
 
 async function deleteCart(cartId) {
+  await findCartById(cartId);
   return await ShoppingCart.findByIdAndDelete(cartId);
 }