Rails - Jul 2006 - Newbie error: undefined local variable or method

When I add an item to the shopping cart, I get an error:

undefined local variable or method `cart_item'' for
#<#<Class:0x3715a78>:0x3715a48>



Session info says the cart being updated properly. I''m just not able
to output two variables:
<%= cart_item.quantity %> &times; <%= h(cart_item.title) %>

I did some research, and I can grasp that local variables aren''t
accessible here, but I''m not sure how to troubleshoot and find where
the problem occurs. (I''m coming from php and coldfusion, so maybe my
head is warped in the wrong direction.)

One thing that throws me is that cart_item is a class (CartItem), not
a var or a method...???

Code included below for reference.



The code starts with the Store controller:

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



The add_product method is in the Cart model:

class Cart
	include Reloadable
	attr_reader :items

	def initialize
		@items = []
	end

	def add_product(product)
		existing_product = @items.find {|item| item.product == product}
		if existing_product
			existing_product.increment_quantity
		else
			@items << CartItem.new(product)
		end
	end
end



The cart_item.quantity and cart_item.title come from the CartItem model:

class CartItem
	include Reloadable
	attr_reader :product, :quantity
	
	def initialize(product)
		@product = product
		@quantity = 1
	end
	
	def increment_quantity
		@quantity += 1
	end
	
	def title
		@product.title
	end

	def price
		@product.price * @quantity
	end
end



Thanks in advance for any assistance,
-- 
Austin Govella
Thinking & Making: IA, UX, and IxD
http://thinkingandmaking.com
austin.govella@gmail.com

Austin,

You need to do:
<%= @cart_item.quantity %> &times; <%= h(@cart_item.title) %>

Zack

On 7/23/06, Austin Govella <austin.govella@gmail.com>
wrote:
> When I add an item to the shopping cart, I get an error:
>
> undefined local variable or method `cart_item'' for
> #<#<Class:0x3715a78>:0x3715a48>
>
>
>
> Session info says the cart being updated properly. I''m just not
able
> to output two variables:
> <%= cart_item.quantity %> &times; <%= h(cart_item.title) %>
>
> I did some research, and I can grasp that local variables aren''t
> accessible here, but I''m not sure how to troubleshoot and find
where
> the problem occurs. (I''m coming from php and coldfusion, so maybe
my
> head is warped in the wrong direction.)
>
> One thing that throws me is that cart_item is a class (CartItem), not
> a var or a method...???
>
> Code included below for reference.
>
>
>
> The code starts with the Store controller:
>
>   def add_to_cart
>       @cart = find_cart
>       @product = Product.find(params[:id])
>       @cart.add_product(@product)
>   end
>
>
>
> The add_product method is in the Cart model:
>
> class Cart
>         include Reloadable
>         attr_reader :items
>
>         def initialize
>                 @items = []
>         end
>
>         def add_product(product)
>                 existing_product = @items.find {|item| item.product ==
product}
>                 if existing_product
>                         existing_product.increment_quantity
>                 else
>                         @items << CartItem.new(product)
>                 end
>         end
> end
>
>
>
> The cart_item.quantity and cart_item.title come from the CartItem model:
>
> class CartItem
>         include Reloadable
>         attr_reader :product, :quantity
>
>         def initialize(product)
>                 @product = product
>                 @quantity = 1
>         end
>
>         def increment_quantity
>                 @quantity += 1
>         end
>
>         def title
>                 @product.title
>         end
>
>         def price
>                 @product.price * @quantity
>         end
> end
>
>
>
> Thanks in advance for any assistance,
> --
> Austin Govella
> Thinking & Making: IA, UX, and IxD
> http://thinkingandmaking.com
> austin.govella@gmail.com
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