我一直在关注这个 Railscast在一个新的测试应用程序中实现 Active Merchant 并且进展顺利，但现在我正试图将我所做的添加到我的主应用程序中它的破坏。
在我的测试应用程序上单击“添加到购物车”时，它会重定向到当前购物车并按预期列出该项目。
在我的主应用程序上单击添加到购物车链接重定向到：
http://mainapp.dev/line_items?product_id=1
line_items 控制器如下所示：
class LineItemsController < ApplicationController
def create
@product = Product.find(params[:product_id])
@line_item = LineItem.create!(:cart => current_cart, :product => @product, :quantity => 1, :unit_price => @product.price)
flash[:notice] = "Added #{@product.name} to cart."
redirect_to current_cart_url
end
end
添加到购物车链接如下所示：
<%= link_to "Add to Cart", line_items_path(:product_id => product), :method => :post, :class => "product_actions" %>
编辑 - 日志
添加项目的测试版本（工作）：
Started POST "/line_items?product_id=5" for 127.0.0.1 at 2011-09-01 07:33:27 +0100
Processing by LineItemsController#create as HTML
Parameters: {"authenticity_token"=>"li7gkjksc9MENevuGz7emDwnbB6HrvPAE3CY=", "product_id"=>"5"}
[1m[35mProduct Load (0.4ms)[0m SELECT `products`.* FROM `products` WHERE `products`.`id` = 5 LIMIT 1
[1m[36m (33.1ms)[0m [1mBEGIN[0m
[1m[35mSQL (179.4ms)[0m INSERT INTO `carts` (`created_at`, `purchased_at`, `updated_at`) VALUES ('2011-09-01 06:33:28', NULL, '2011-09-01 06:33:28')
[1m[36m (48.3ms)[0m [1mCOMMIT[0m
[1m[35m (0.2ms)[0m BEGIN
[1m[36mSQL (0.2ms)[0m [1mINSERT INTO `line_items` (`cart_id`, `created_at`, `product_id`, `quantity`, `unit_price`, `updated_at`) VALUES (29, '2011-09-01 06:33:29', 5, 1, 250, '2011-09-01 06:33:29')[0m
[1m[35m (0.5ms)[0m COMMIT
Redirected to http://sell.dev/cart
Completed 302 Found in 1265ms
Started GET "/cart" for 127.0.0.1 at 2011-09-01 07:33:29 +0100
Processing by CartsController#show as HTML
[1m[36mCart Load (0.2ms)[0m [1mSELECT `carts`.* FROM `carts` WHERE `carts`.`id` = 29 LIMIT 1[0m
[1m[35mLineItem Load (0.3ms)[0m SELECT `line_items`.* FROM `line_items` WHERE `line_items`.`cart_id` = 29
[1m[36mProduct Load (0.5ms)[0m [1mSELECT `products`.* FROM `products` WHERE `products`.`id` = 5 LIMIT 1[0m
Rendered carts/show.html.erb within layouts/application (202.1ms)
Rendered layouts/_header.html.erb (0.8ms)
Rendered layouts/_footer.html.erb (0.7ms)
Completed 200 OK in 368ms (Views: 284.2ms | ActiveRecord: 79.5ms)
主应用版本：
Started GET "/line_items?product_id=1" for 127.0.0.1 at 2011-09-01 07:34:59 +0100
Processing by LineItemsController#index as HTML
Parameters: {"product_id"=>"1"}
Rendered line_items/index.html.erb within layouts/application (0.3ms)
Rendered layouts/_header.html.erb (1.3ms)
Rendered layouts/_footer.html.erb (178.4ms)
Completed 200 OK in 218ms (Views: 182.3ms | ActiveRecord: 35.5ms)
我不明白为什么要重定向到订单项索引而不是创建，代码是一样的。
编辑 - 路线
get "cart" => "carts#show", :as => "current_cart"
resources :orders
resources :line_items
resources :carts
resources :products
resources :order_transactions
编辑 - 取自我的应用程序控制器
def current_user
@current_user ||= User.find(session[:user_id]) if session[:user_id]
end
def current_cart
if session[:cart_id]
@current_cart ||= Cart.find(session[:cart_id])
session[:cart_id] = nil if @current_cart.purchased_at
end
if session[:cart_id].nil?
@current_cart = Cart.create!
session[:cart_id] = @current_cart.id
end
@current_cart
end
感谢您的任何帮助，非常感谢！