Web开发敏捷之道-应用Rails进行敏捷Web开发遇到问题

Question

undefined method product' for #<Product:0x48b2c44>
在学习<应用Rails进行敏捷Web开发>第八章 迭代C 1 :创建购物车遇到undefined methodproduct' for #Product:0x48b2c44错误
NoMethodError in StoreController#add_to_cart

undefined method `product' for #Product:0x4a02900

RAILS_ROOT: ./script/../config/..

D:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1860:in method_missing'
#{RAILS_ROOT}/app/models/cart.rb:16:inadd_product'
#{RAILS_ROOT}/app/models/cart.rb:16:in each'
#{RAILS_ROOT}/app/models/cart.rb:16:infind'
#{RAILS_ROOT}/app/models/cart.rb:16:in add_product'
#{RAILS_ROOT}/app/controllers/store_controller.rb:11:inadd_to_cart'

我的cart.rb 文件代码如下

lass Cart

attr_reader :items

def initialize
@items = []
end

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

store_controller.rb代码如下
class StoreController < ApplicationController

def index
@products = Product.find_products_for_sale
end

def add_to_cart
@cart = find_cart

product = Product.find(params[:id])
@cart.add_product(product)

end

private

def find_cart
session[:cart] ||= Cart.new
end
end

难道product被系统认成了一个可执行方法,而没有被认成一个对象放在items[]数据中

[b]问题补充：[/b]
我按照书上把session保存到数据库中,
现在把session重新生成,问题还是没有解决

Answer 1

删除session文件，重起服务器再试试看