Rails7中Devise管理员登录路由重定向至首页问题求助

我正在构建一个包含Admin和User端的Ruby on Rails 7应用。配置Devise后，访问Devise路由（如/admins/sign_in）会被重定向至home#index。起初以为是缺少Devise视图，执行rails generate devise:views创建视图后问题仍未解决。以下是我的routes.rb和服务器日志：

Rails.application.routes.draw do
  devise_for :admins
  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html

  # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.
  # Can be used by load balancers and uptime monitors to verify that the app is live.
  get "up" => "rails/health#show", as: :rails_health_check

  # Defines the root path route ("/")
   root "home#index"

   authenticated :admin_user do
    root to: "admin#index", as: :admin_root
   end

   get "admin" => "admin#index"
end

=> Booting Puma
=> Rails 7.1.3.3 application starting in development 
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 6.4.2 (ruby 3.3.1-p55) ("The Eagle of Durango")
*  Min threads: 5
*  Max threads: 5
*  Environment: development
*          PID: 14050
* Listening on http://127.0.0.1:3000
* Listening on http://[::1]:3000
Use Ctrl-C to stop
Started GET "/" for 127.0.0.1 at 2024-06-01 07:34:29 +0200
  ActiveRecord::SchemaMigration Load (0.2ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 1.5ms | Allocations: 286)
  Rendered layout layouts/application.html.erb (Duration: 339.3ms | Allocations: 78245)
Completed 200 OK in 360ms (Views: 347.1ms | ActiveRecord: 0.0ms | Allocations: 82659)


Started GET "/admins/sign_in" for 127.0.0.1 at 2024-06-01 07:34:38 +0200
Processing by Devise::SessionsController#new as HTML
  Admin Load (0.3ms)  SELECT "admins".* FROM "admins" WHERE "admins"."id" = ? ORDER BY "admins"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
Redirected to http://localhost:3000/
Filter chain halted as :require_no_authentication rendered or redirected
Completed 302 Found in 70ms (ActiveRecord: 7.4ms | Allocations: 17165)


Started GET "/" for 127.0.0.1 at 2024-06-01 07:34:38 +0200
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 0.2ms | Allocations: 37)
  Rendered layout layouts/application.html.erb (Duration: 35.1ms | Allocations: 8276)
Completed 200 OK in 37ms (Views: 36.3ms | ActiveRecord: 0.0ms | Allocations: 8535)


Started GET "/" for 127.0.0.1 at 2024-06-01 07:35:12 +0200
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 0.8ms | Allocations: 159)
  Rendered layout layouts/application.html.erb (Duration: 65.8ms | Allocations: 25157)
Completed 200 OK in 70ms (Views: 68.5ms | ActiveRecord: 0.0ms | Allocations: 26088)


Started GET "/admin/sign_in" for 127.0.0.1 at 2024-06-01 07:35:20 +0200
  
ActionController::RoutingError (No route matches [GET] "/admin/sign_in"):
  
Started GET "/admins/sign_in" for 127.0.0.1 at 2024-06-01 07:35:32 +0200
Processing by Devise::SessionsController#new as HTML
  Admin Load (0.2ms)  SELECT "admins".* FROM "admins" WHERE "admins"."id" = ? ORDER BY "admins"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
Redirected to http://localhost:3000/
Filter chain halted as :require_no_authentication rendered or redirected
Completed 302 Found in 22ms (ActiveRecord: 8.1ms | Allocations: 5881)


Started GET "/" for 127.0.0.1 at 2024-06-01 07:35:32 +0200
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 0.2ms | Allocations: 37)
  Rendered layout layouts/application.html.erb (Duration: 32.8ms | Allocations: 8408)
Completed 200 OK in 35ms (Views: 34.5ms | ActiveRecord: 0.0ms | Allocations: 8662)


Started GET "/admins/sign_in" for 127.0.0.1 at 2024-06-01 07:44:14 +0200
Processing by Devise::SessionsController#new as HTML
  Admin Load (1.9ms)  SELECT "admins".* FROM "admins" WHERE "admins"."id" = ? ORDER BY "admins"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
Redirected to http://localhost:3000/
Filter chain halted as :require_no_authentication rendered or redirected
Completed 302 Found in 43ms (ActiveRecord: 2.9ms | Allocations: 5332)


Started GET "/" for 127.0.0.1 at 2024-06-01 07:44:14 +0200
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 3.5ms | Allocations: 157)
  Rendered layout layouts/application.html.erb (Duration: 570.5ms | Allocations: 26921)
Completed 200 OK in 585ms (Views: 580.6ms | ActiveRecord: 0.0ms | Allocations: 27850)

问题分析 #

从日志中可以看到两个关键问题：

1. 已登录Admin用户导致重定向：每次访问/admins/sign_in时，日志都会加载id=1的Admin记录，说明当前会话中已有已认证的Admin用户。Devise的require_no_authentication过滤器会自动阻止已登录用户访问登录页面，重定向到默认根路径home#index。
2. 路由配置错误：routes.rb中的authenticated :admin_user是错误的，应为:admin（对应你的Devise模型Admin）。

解决步骤 #

1. 清除已登录的Admin会话 #

通过以下方式之一清除登录状态：

• 关闭浏览器并清除缓存/会话数据
• 在Rails控制台中删除当前登录的Admin用户：

  # 执行rails c进入控制台
  Admin.find(1).destroy
  

• 执行数据库重置（仅开发环境使用，会清空所有数据）：

  rails db:reset
  

2. 修正routes.rb中的认证路由 #

将authenticated :admin_user改为authenticated :admin，修正后的代码如下：

Rails.application.routes.draw do
  devise_for :admins

  get "up" => "rails/health#show", as: :rails_health_check

  # 未认证用户的根路径
  root "home#index"

  # 已认证Admin用户的根路径
  authenticated :admin do
    root to: "admin#index", as: :admin_root
  end

  get "admin" => "admin#index"
end

3. 验证正确的路由 #

执行以下命令查看所有Devise生成的Admin路由：

rails routes | grep admin

确保访问正确的登录路由（应为/admins/sign_in，而非/admin/sign_in，后者会触发路由错误）。

内容的提问来源于stack exchange，提问作者Mambo Zulu