无法找到路径“/ sessions / user”的设计映射设计错误
最近几天非常令人沮丧。
我有一个安装了Devise的rails应用程序，我生成了一个新的User模型，我也生成了Devise视图。
当我在填写电子邮件和密码字段后单击“登录”时尝试以现有用户身份登录时会发生这种情况：
AbstractController::ActionNotFound - Could not find devise mapping for path "/sessions/user". This may happen for two reasons: 1) You forgot to wrap your route inside the scope block. For example: devise_scope :user do get "/some/route" => "some_devise_controller" end 2) You are testing a Devise controller bypassing the router. If so, you can explicitly tell Devise which mapping to use: @request.env["devise.mapping"] = Devise.mappings[:user] : devise (3.2.4) app/controllers/devise_controller.rb:84:in `unknown_action!' devise (3.2.4) app/controllers/devise_controller.rb:59:in `assert_is_devise_resource!' devise (3.2.4) app/controllers/devise_controller.rb:97:in `require_no_authentication' activesupport (4.0.4) lib/active_support/callbacks.rb:397:in `_run__1955514966561508052__process_action__callbacks' activesupport (4.0.4) lib/active_support/callbacks.rb:80:in `run_callbacks' actionpack (4.0.4) lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack (4.0.4) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (4.0.4) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' activesupport (4.0.4) lib/active_support/notifications.rb:159:in `block in instrument' activesupport (4.0.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.0.4) lib/active_support/notifications.rb:159:in `instrument' actionpack (4.0.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action' actionpack (4.0.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' activerecord (4.0.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action' actionpack (4.0.4) lib/abstract_controller/base.rb:136:in `process' actionpack (4.0.4) lib/abstract_controller/rendering.rb:44:in `process' actionpack (4.0.4) lib/action_controller/metal.rb:195:in `dispatch' actionpack (4.0.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' actionpack (4.0.4) lib/action_controller/metal.rb:231:in `block in action' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:80:in `dispatch' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:48:in `call' actionpack (4.0.4) lib/action_dispatch/journey/router.rb:71:in `block in call' actionpack (4.0.4) lib/action_dispatch/journey/router.rb:59:in `call' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:674:in `call' warden (1.2.3) lib/warden/manager.rb:35:in `block in call' warden (1.2.3) lib/warden/manager.rb:34:in `call' rack (1.5.2) lib/rack/etag.rb:23:in `call' rack (1.5.2) lib/rack/conditionalget.rb:35:in `call' rack (1.5.2) lib/rack/head.rb:11:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/flash.rb:241:in `call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/cookies.rb:486:in `call' activerecord (4.0.4) lib/active_record/query_cache.rb:36:in `call' activerecord (4.0.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call' activerecord (4.0.4) lib/active_record/migration.rb:373:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.0.4) lib/active_support/callbacks.rb:373:in `_run__2142997860843545523__call__callbacks' activesupport (4.0.4) lib/active_support/callbacks.rb:80:in `run_callbacks' actionpack (4.0.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/reloader.rb:64:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' better_errors (1.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call' better_errors (1.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call' better_errors (1.1.0) lib/better_errors/middleware.rb:56:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.0.4) lib/rails/rack/logger.rb:38:in `call_app' railties (4.0.4) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.0.4) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.0.4) lib/rails/rack/logger.rb:20:in `call' quiet_assets (1.0.2) lib/quiet_assets.rb:18:in `call_with_quiet_assets' actionpack (4.0.4) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' rack (1.5.2) lib/rack/runtime.rb:17:in `call' activesupport (4.0.4) lib/active_support/cache/strategy/local_cache.rb:83:in `call' rack (1.5.2) lib/rack/lock.rb:17:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/static.rb:64:in `call' rack (1.5.2) lib/rack/sendfile.rb:112:in `call' railties (4.0.4) lib/rails/engine.rb:511:in `call' railties (4.0.4) lib/rails/application.rb:97:in `call' rack (1.5.2) lib/rack/lock.rb:17:in `call' rack (1.5.2) lib/rack/content_length.rb:14:in `call' rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' /Users/AaronWilliamson/.rubies/ruby-2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service' /Users/AaronWilliamson/.rubies/ruby-2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run' /Users/AaronWilliamson/.rubies/ruby-2.1.0/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread' 问题是，当我注册成为新用户时，它的工作正常。 我可以填写相应的字段，单击“注册”，它会通知我已成功登录并将我重定向到显示用户已登录的根URL。只有在我尝试登录时才会出现错误。
这是我的路线：
Ripelist::Application.routes.draw do devise_for :users, path_names: { sign_in: 'login', sign_out: 'logout', sign_up: 'signup' } root to: 'listings#index' match '/sessions/user', to: 'devise/sessions#create', via: :post resources :users resources :listings resources :categories resources :sessions end
有人可以帮忙吗？
在您的routes.rb文件中，尝试将您的路由包装在范围块内，如错误消息所示。 这是一个例子：
devise_scope :user do get "signup", to: "devise/registrations#new" get "login", to: "devise/sessions#new" get "logout", to: "devise/sessions#destroy" end
这将为您提供名称很好的路线。
顺便说一句，如果你使用Rails 4，摆脱匹配方法。 你需要指定HTTP动词。
OBSOLETE老回答：
（下面是旧的过时版本的代码，显示供参考。使用上面的代码。）
devise_for :users, path_names: { sign_in: 'login', sign_out: 'logout', sign_up: 'signup' }
和
match '/sessions/user', to: 'devise/sessions#create', via: :post
如果您使用命名空间路由来声明devise_scope有点不同，请小心：
namespace :api, defaults: {format: 'json'} do namespace :v1 do devise_scope :api_v1_user do ... end end end
如果devise_scope传递的是多个范围而不是单个范围，则会出现此错误（ AbstractController::ActionNotFound - Could not find devise mapping for path ）。
devise_for方法采用复数forms的模型范围（即：用户），而devise_scope采用单数forms（即:user ）。
从设计文件（ http://www.rubydoc.info/github/plataformatec/devise/ActionDispatch%2FRouting%2FMapper%3Adevise_scope ）：
还要注意’devise_scope’和’as’使用名词的单数forms，其他设计路线命令期望复数forms。 这将是一个很好的工作实例。
devise_scope :user do get "/some/route" => "some_devise_controller" end devise_for :users
错误告诉你：
devise_scope :user do match '/sessions/user', to: 'devise/sessions#create', via: :post end
你试过吗？