CODEWITHSUNDEEP
javascriptnode.js
MaksimNikicin
MaksimNikicin

Reputation: 27

Why function becoming undefined?

I have express session, which initializing in route method:

router.post('/add', function (req, res) {
   if (!req.session.cart) {
      req.session.cart = cartController.initializeCart();
   }
   cartController.addToCart(req.body.productId, req.session.cart, function(error, result) {
      error ? res.send(error) : res.send(200);
   })
});

And I have cart model as function

function cart() {
  this.ids = [];
  this.addProduct = function (id) {
    ids.push(id);
   }
}

Initialize method: 

  var cartModel = require("../models/cart"); //UPD
  initializeCart: function() {
      return new cartModel();   //UPD exception throw right after this operation
  },

Add cart method:

   addToCart: function(id, cart, callback) {
      cart.addProduct(id);
       .....

Session:

var expressSession = require('express-session');
app.use(expressSession({
  secret: "someSecret"
}));

But calling cart.addProduct() doesn't occurs, because addProduct() is undefined. Using prototype doesn't help me.

Screen: http://prntscr.com/5rz61t

Upvotes: 0

Views: 83

Answers (2)

KyleK
KyleK

Reputation: 5131

If cart is saved in a session storage system that does not keep or restore types, cart will not be a cart instance any longer but just a simple object.

router.post('/add', function (req, res) {
   var cart;
   cart = cartController.initializeCart();
   if (req.session.cart) {
      cart.ids = req.session.cart.ids;
   } else {
      req.session.cart = cart;
   }
   cartController.addToCart(req.body.productId, cart, function(error, result) {
      error ? res.send(error) : res.send(200);
   })
});

Upvotes: 1

Alex
Alex

Reputation: 11255

There is no cartModel function in your code.

Try return new cart(); instead of return new cartModel();

Upvotes: 1

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