Dear all,
I''m going, by the book, through the book "Agile Web Development
with
Rails, 2nd edition". I get stuck in section 8.2
I am running into following error:
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NoMethodError in Store#add_to_cart
Showing app/views/store/add_to_cart.html.erb where line #4 raised:
You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.items
Extracted source (around line #4):
1:
2: <h1> Your Pragmatic Cart</h1>
3: <ul>
4: <% for product in @cart.items %>
5: <li><%= h(product.title) %></li>
6: <% end %>
7: </ul>
RAILS_ROOT: /home/gaoxh04/rails/depot
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The following is the ruby code:
app/controllers/store_controller.rb
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class StoreController < ApplicationController
def index
@products = Product.find_products_for_sale
end
private
def find_cart
session[:cart] ||= Cart.new
end
def add_to_cart
@cart = Cart.new
product = Product.find(params[:id])
@cart.add_product(product)
end
end
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app/models/cart.rb
----------------------------------------------------------------------------------------------------------------
class Cart
attr_reader :items
def initialize
@items = []
end
def add_product(product)
@items << product
end
end
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Kind regards,
Xiahong
On Jun 17, 10:51 pm, Xiahong Gao <gaox...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> --------------------------------------------------------------------------- ------------------------------------- > class StoreController < ApplicationController > > def index > @products = Product.find_products_for_sale > end > > private > def find_cart > session[:cart] ||= Cart.new > end > > def add_to_cart > @cart = Cart.new > product = Product.find(params[:id]) > @cart.add_product(product) > endYou''ve made your add_to_cart action private which it shouldn''t be ( rails ignores private methods when looking for actions, so it has just rendered the template without running your add_to_cart method at all. Fred
Oh, I didn''t notice that.. thanks a lot .. I appreciate it. 2009/6/18 Frederick Cheung <frederick.cheung-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>> > On Jun 17, 10:51 pm, Xiahong Gao <gaox...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > --------------------------------------------------------------------------- > ------------------------------------- > > class StoreController < ApplicationController > > > > def index > > @products = Product.find_products_for_sale > > end > > > > private > > def find_cart > > session[:cart] ||= Cart.new > > end > > > > def add_to_cart > > @cart = Cart.new > > product = Product.find(params[:id]) > > @cart.add_product(product) > > end > > You''ve made your add_to_cart action private which it shouldn''t be > ( rails ignores private methods when looking for actions, so it has > just rendered the template without running your add_to_cart method at > all. > > Fred > > > >--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---