Node.js | Express.js - Exercise: Refactor 'Add to Cart' Functionality

In this video, we refactor our code on "Add to Cart" Functionality to remove duplicated code.

[jamiec]

I have come back to these videos so often in the past few days while trying to get my assessment code working, it's finally starting to come together :D
You are the best ! Thanks.

[agusp]

I got error like this
{
"success": "failed",
"msg": "Cannot set property 'qty' of undefined"
}
I copied your controllers\shop.js and models\cart.js and of course routes\shop.js