当我尝试登录或注册时，我的rails应用程序出现以下错误(我正在使用Devise GEM进行登录)。
Routing Error
No route matches {:controller=>"devise/products"}
该应用程序的所有源代码都可以在这里找到：https://github.com/rossmc/topsnowboards
我尝试将application.html.erb和product/index.html.erb中的link_to从：
<%= link_to 'sign in', new_user_session_path %>
自：
<%= link_to 'sign in', :controller => "/products", new_user_session_path %>.
但这只会引发更多错误。
有趣的是，在我为购物车添加部分之前，登录功能和路由工作正常，我在上次提交时将其放置在应用程序.html.erb中。 当我删除此部分时，路由错误消失了，但我丢失了部分视图/购物车/_cart.html.erb。
下面是我尝试登录并运行 rake routes 命令时的控制台转储。 提前感谢您抽出宝贵时间查看此内容。
控制台转储
Connecting to database specified by database.yml
DEPRECATION WARNING: Passing a block to devise_for is deprecated. Please remove the block from devise_for (only the block, the call to devise_for must still exist) and call devise_scope :user do ... end with the block instead. (called from block in <top (required)> at C:/Users/Ross/Documents/NCI-HDip/Server Side/PROJ - Server Side/site/config/routes.rb:16)
Started GET "/users/sign_up" for 127.0.0.1 at 2012-12-02 22:15:33 +0000
Processing by Devise::RegistrationsController#new as HTML
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/shared/_links.erb (2.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/registrations/new.html.erb within layouts/application (106.0ms)
[1m[36mProduct Load (0.0ms)[0m [1mSELECT DISTINCT product_type FROM "products" [0m
Rendered products/_product_typeDistinctList.html (54.0ms)
Rendered cart/_cart.html.erb (91.0ms)
Completed 500 Internal Server Error in 834ms
ActionController::RoutingError (No route matches {:controller=>"devise/products"}):
app/views/cart/_cart.html.erb:49:in `_app_views_cart__cart_html_erb__355880610_32436408'
app/views/layouts/application.html.erb:53:in `_app_views_layouts_application_html_erb__478801204_33653088'
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (1.0ms)
Started GET "/cart/3" for 127.0.0.1 at 2012-12-02 22:15:39 +0000
Processing by CartController#add as HTML
Parameters: {"id"=>"3"}
Completed 401 Unauthorized in 1ms
Started GET "/users/sign_in" for 127.0.0.1 at 2012-12-02 22:15:39 +0000
Processing by Devise::SessionsController#new as HTML
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/shared/_links.erb (1.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/sessions/new.html.erb within layouts/application (11.0ms)
[1m[35mProduct Load (0.0ms)[0m SELECT DISTINCT product_type FROM "products"
Rendered products/_product_typeDistinctList.html (1.0ms)
Rendered cart/_cart.html.erb (4.0ms)
Completed 500 Internal Server Error in 54ms
ActionController::RoutingError (No route matches {:controller=>"devise/products"}):
app/views/cart/_cart.html.erb:49:in `_app_views_cart__cart_html_erb__355880610_32436408'
app/views/layouts/application.html.erb:53:in `_app_views_layouts_application_html_erb__478801204_33653088'
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (1.0ms)
Started GET "/users/sign_in" for 127.0.0.1 at 2012-12-02 22:15:43 +0000
Processing by Devise::SessionsController#new as HTML
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/shared/_links.erb (1.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/sessions/new.html.erb within layouts/application (9.0ms)
[1m[36mProduct Load (0.0ms)[0m [1mSELECT DISTINCT product_type FROM "products" [0m
Rendered products/_product_typeDistinctList.html (1.0ms)
Rendered cart/_cart.html.erb (4.0ms)
Completed 500 Internal Server Error in 51ms
ActionController::RoutingError (No route matches {:controller=>"devise/products"}):
app/views/cart/_cart.html.erb:49:in `_app_views_cart__cart_html_erb__355880610_32436408'
app/views/layouts/application.html.erb:53:in `_app_views_layouts_application_html_erb__478801204_33653088'
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.0ms)
耙子路线
C:UsersRossDocumentsNCI-HDipServer SidePROJ - Server Sidesite>rake routes
profiles GET /profiles(.:format) profiles#index
POST /profiles(.:format) profiles#create
new_profile GET /profiles/new(.:format) profiles#new
edit_profile GET /profiles/:id/edit(.:format) profiles#edit
profile GET /profiles/:id(.:format) profiles#show
PUT /profiles/:id(.:format) profiles#update
DELETE /profiles/:id(.:format) profiles#destroy
lineitems_index GET /lineitems/index(.:format) lineitems#index
lineitems_show GET /lineitems/show(.:format) lineitems#show
lineitems_new GET /lineitems/new(.:format) lineitems#new
lineitems_edit GET /lineitems/edit(.:format) lineitems#edit
order_lineitems GET /orders/:order_id/lineitems(.:format) lineitems#index
POST /orders/:order_id/lineitems(.:format) lineitems#create
new_order_lineitem GET /orders/:order_id/lineitems/new(.:format) lineitems#new
edit_order_lineitem GET /orders/:order_id/lineitems/:id/edit(.:format) lineitems#edit
order_lineitem GET /orders/:order_id/lineitems/:id(.:format) lineitems#show
PUT /orders/:order_id/lineitems/:id(.:format) lineitems#update
DELETE /orders/:order_id/lineitems/:id(.:format) lineitems#destroy
orders GET /orders(.:format) orders#index
POST /orders(.:format) orders#create
new_order GET /orders/new(.:format) orders#new
edit_order GET /orders/:id/edit(.:format) orders#edit
order GET /orders/:id(.:format) orders#show
PUT /orders/:id(.:format) orders#update
DELETE /orders/:id(.:format) orders#destroy
GET /orders(.:format) orders#index
POST /orders(.:format) orders#create
GET /orders/new(.:format) orders#new
GET /orders/:id/edit(.:format) orders#edit
GET /orders/:id(.:format) orders#show
PUT /orders/:id(.:format) orders#update
DELETE /orders/:id(.:format) orders#destroy
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
products GET /products(.:format) products#index
POST /products(.:format) products#create
new_product GET /products/new(.:format) products#new
edit_product GET /products/:id/edit(.:format) products#edit
product GET /products/:id(.:format) products#show
PUT /products/:id(.:format) products#update
DELETE /products/:id(.:format) products#destroy
cart_index GET /cart/index(.:format) cart#index
site_home GET /site/home(.:format) site#home
site_shop GET /site/shop(.:format) site#shop
site_guide GET /site/guide(.:format) site#guide
site_links GET /site/links(.:format) site#links
site_contact GET /site/contact(.:format) site#contact
cart /cart(.:format) cart#index
/cart/:id(.:format) cart#add
/cart/remove/:id(.:format) cart#remove
clearCart /clearCart(.:format) cart#clearCart
home /home(.:format) site#home
shop /shop(.:format) products#index
guide /guide(.:format) site#guide
links /links(.:format) site#links
contact /contact(.:format) site#contact
checkout /checkout(.:format) cart#createOrder
/product_type/:id(.:format) products#product_type
myprofile /myprofile(.:format) profiles#myprofile
root / site#home
更仔细地查看堆栈跟踪：
Started GET "/users/sign_up" for 127.0.0.1 at 2012-12-02 18:47:23 -0500
Processing by Devise::RegistrationsController#new as HTML
Rendered /home/jon/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/shared/_links.erb (0.3ms)
Rendered /home/jon/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/devise-2.1.2/app/views/devise/registrations/new.html.erb within layouts/application (2.3ms)
Rendered products/_search.html.erb (0.3ms)
Product Load (0.1ms) SELECT DISTINCT product_type FROM "products"
Rendered products/_product_typeDistinctList.html (0.5ms)
Rendered cart/_cart.html.erb (0.7ms)
Completed 500 Internal Server Error in 14ms
ActionController::RoutingError (No route matches {:controller=>"devise/products"}):
app/views/cart/_cart.html.erb:49:in `_app_views_cart__cart_html_erb___3785130162884562793_21827300'
app/views/layouts/application.html.erb:59:in `_app_views_layouts_application_html_erb___2170720560050181211_22251920'
Rendered /home/jon/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.5ms)
找到了？日志显示它已经渲染了一堆部分，精确到cart/_cart.html.erb。它甚至告诉您错误发生在第 49 行。现在第 49 行是什么？这：
<%= link_to 'Keep Shopping', :controller => :products %>
<%= link_to 'Empty Cart', :controller => "cart", :action => "clearCart" %>
<%= link_to 'Proceed to Check Out', :controller => "cart", :action => "createOrder" %>
正如 Ryan 在下面的评论中正确指出的那样，Rails 正在寻找Devise下的部分范围，因为这是您渲染的范围。
更简单地说，你可以给它提供路由名称(你可以在rake routes中找到的那个)，你_path添加帮助程序形成一个URL。products_path最终成为products#index的 URL 字符串。
这在你的情况下给出
<%= link_to 'Keep Shopping', products_path %>
<%= link_to 'Empty Cart', clearCart_path %>
<%= link_to 'Proceed to Check Out', checkout_path %>
听听你的堆栈跟踪，他们正在和你说话！
派对晚了，但这是我的解决方案。 只需在控制器前面加上">/"作为绝对前缀即可。 有点长和丑陋，但返回控制器/操作或传递的路由的链接。 我用它来构建从sql表驱动的菜单。
# dynamic link_to
def menu_link(params, html_options=nil)
if params[:controller].present?
link_to params[:display], {controller: "/#{params[:controller]}", action: params[:resource]}, default_navigation_options(html_options)
elsif params[:route].present?
link_to params[:display], params[:route], default_navigation_options(html_options)
end
end