NoMethodError in StoreController#add_to_cart -> getting nil

rubyonrails-talk
1

Hey everybody,

I am currently following the depot application from the book Web Agile Development with Rails (3rd Edition) but after creating the controller for the Store and the Cart model, I am always getting a nil product, no matter how many products I add to the database. I am very new with RoR (this only the page 110 of the book) and thus I am not very sure about what I could do to mitigate the problem.

Thanks a lot in advance!

2

Manuel Manuel wrote:

Hey everybody,

I am currently following the depot application from the book Web Agile Development with Rails (3rd Edition) but after creating the controller for the Store and the Cart model, I am always getting a nil product, no matter how many products I add to the database. I am very new with RoR (this only the page 110 of the book) and thus I am not very sure about what I could do to mitigate the problem.

Thanks a lot in advance!

The errors are both Cart.rb, line number 9:

def add_product(product)     -> @items << product end

and

def add_to_cart     product = Product.find(params[:id])     @cart = find_cart -> @cart.add_product(product) end

Error: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.<<