Function decreaseItemQuantity

server/controllers/cart.controller.js:38–44

(req, res)

// decrement item quantity by 1
const decreaseItemQuantity = async (req, res) => {
  const { product_id } = req.body;
  const cart_id = req.user.cart_id;

  const cart = await cartService.decreaseQuantity({ cart_id, product_id });
  res.json(cart);
};

module.exports = {
  getCart,