ArgumentError in StoreController#add_to_cart: wrong number of arguments (1 for 0)

rubyonrails-talk
1

I am really new to Ruby and Rails but as you probably see I am trying to get the shopping card working from the book. I am getting this error but I really don't know what to do. I have looked up several of topics that stated the same problem but as far as I am, nothing has helped me out yet. Is there something wrong with the Product model?

This is in the StoreController and I believe it is all good.

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

Thanks in advance

2

Well, let's see, the title of your post is "ArgumentError in StoreController#add_to_cart, wrong number of arguments (1 for 0)." I assume that this is because that's the error you are seeing.

So what could that mean? It means that someone is calling StoreController#add_to_cart with an argument, but add_to_cart doesn't accept any arguments.

The problem isn't in the definition of add_to_cart, controller action methods don't take ruby arguments. So...

Somewhere some other code. A view? A model method, some other controller method is calling add_to_cart with a parameter.

That's why the error page should show a stack trace, doesn't it? That should point you to the code which called add_to_cart which is the code which needs to be fixed.

3

Hey Rick,

First of all, thank you for your reply, it finally works! So what did I do?I analyzed the stack trace and concluded that the problem was situated in the cart.rb At line 13:

      @items << CartItem.new(product)

It could not assign a new product to the CartItem model so I looked at the cart_item.rb: The "initialize" - which stands for constructor in Ruby I guess - was spelled wrong and that was my problem! Now it seems to work properly.

4

Ok! And

Well! And if this line and listed all above is present, but the error remains?

5

edit in cart_item.rb

// before def initialize @product = product @quantity = 1 end

// after def initialize(product)   @product = product   @quantity = 1 end