Rails - Oct 2007 - ArgumentError in StoreController#add_to_cart: wrong number of arguments (1 for 0)

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


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On 10/15/07, kris.vandenbergh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<kris.vandenbergh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> 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
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.


-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

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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.

On 15 okt, 16:20, "Rick DeNatale"
<rick.denat...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 10/15/07, kris.vandenbe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<kris.vandenbe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > 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
>
> 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.
>
> --
> Rick DeNatale
>
> My blog on Rubyhttp://talklikeaduck.denhaven2.com/

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kris.vandenbergh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
> 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.
Ok! And

Well! And if this line and listed all above is present, but the error 
remains?
-- 
Posted via http://www.ruby-forum.com/.

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kris.vandenbergh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
> 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
edit in cart_item.rb

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

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