我按照说明安装了Rails_Admin，也使用了Devise。当我尝试导航到“/ admin”时，我收到以下错误：
Routing Error
No route matches {:controller=>"home"}
这是我的routes.rb：
Ot::Application.routes.draw do
resources :badgeships
resources :badges
resources :profiles
resources :universities
resources :degrees
resources :jobs
resources :resources
resources :communities
resources :networks
resources :topics do
resources :posts
end
get 'topics/tag/:tag', to: 'topics#index', as: :topic_tag
get 'resources/tag/:tag', to: 'resources#index', as: :resource_tag
root :to => 'home#index'
devise_for :users, path_names: {sign_in: "login", sign_out: "logout"}
mount RailsAdmin::Engine => '/admin', :as => 'rails_admin'
end
这是我的rails_admin.rb初始化程序：
RailsAdmin.config do |config|
config.main_app_name = ["Cool app", "BackOffice"]
# or somethig more dynamic
config.main_app_name = Proc.new { |controller| [ "Cool app", "BackOffice - #{controller.params[:action].try(:titleize)}" ] }
end
如何让rails_admin正常工作？
更新：这是我的佣金路线：
[RailsAdmin] RailsAdmin initialization disabled by default. Pass SKIP_RAILS_ADMIN_INITIALIZER=false if you need it.
badgeships GET /badgeships(.:format) badgeships#index
POST /badgeships(.:format) badgeships#create
new_badgeship GET /badgeships/new(.:format) badgeships#new
edit_badgeship GET /badgeships/:id/edit(.:format) badgeships#edit
badgeship GET /badgeships/:id(.:format) badgeships#show
PUT /badgeships/:id(.:format) badgeships#update
DELETE /badgeships/:id(.:format) badgeships#destroy
badges GET /badges(.:format) badges#index
POST /badges(.:format) badges#create
new_badge GET /badges/new(.:format) badges#new
edit_badge GET /badges/:id/edit(.:format) badges#edit
badge GET /badges/:id(.:format) badges#show
PUT /badges/:id(.:format) badges#update
DELETE /badges/:id(.:format) badges#destroy
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
universities GET /universities(.:format) universities#index
POST /universities(.:format) universities#create
new_university GET /universities/new(.:format) universities#new
edit_university GET /universities/:id/edit(.:format) universities#edit
university GET /universities/:id(.:format) universities#show
PUT /universities/:id(.:format) universities#update
DELETE /universities/:id(.:format) universities#destroy
degrees GET /degrees(.:format) degrees#index
POST /degrees(.:format) degrees#create
new_degree GET /degrees/new(.:format) degrees#new
edit_degree GET /degrees/:id/edit(.:format) degrees#edit
degree GET /degrees/:id(.:format) degrees#show
PUT /degrees/:id(.:format) degrees#update
DELETE /degrees/:id(.:format) degrees#destroy
jobs GET /jobs(.:format) jobs#index
POST /jobs(.:format) jobs#create
new_job GET /jobs/new(.:format) jobs#new
edit_job GET /jobs/:id/edit(.:format) jobs#edit
job GET /jobs/:id(.:format) jobs#show
PUT /jobs/:id(.:format) jobs#update
DELETE /jobs/:id(.:format) jobs#destroy
resources GET /resources(.:format) resources#index
POST /resources(.:format) resources#create
new_resource GET /resources/new(.:format) resources#new
edit_resource GET /resources/:id/edit(.:format) resources#edit
resource GET /resources/:id(.:format) resources#show
PUT /resources/:id(.:format) resources#update
DELETE /resources/:id(.:format) resources#destroy
communities GET /communities(.:format) communities#index
POST /communities(.:format) communities#create
new_community GET /communities/new(.:format) communities#new
edit_community GET /communities/:id/edit(.:format) communities#edit
community GET /communities/:id(.:format) communities#show
PUT /communities/:id(.:format) communities#update
DELETE /communities/:id(.:format) communities#destroy
networks GET /networks(.:format) networks#index
POST /networks(.:format) networks#create
new_network GET /networks/new(.:format) networks#new
edit_network GET /networks/:id/edit(.:format) networks#edit
network GET /networks/:id(.:format) networks#show
PUT /networks/:id(.:format) networks#update
DELETE /networks/:id(.:format) networks#destroy
topic_posts GET /topics/:topic_id/posts(.:format) posts#index
POST /topics/:topic_id/posts(.:format) posts#create
new_topic_post GET /topics/:topic_id/posts/new(.:format) posts#new
edit_topic_post GET /topics/:topic_id/posts/:id/edit(.:format) posts#edit
topic_post GET /topics/:topic_id/posts/:id(.:format) posts#show
PUT /topics/:topic_id/posts/:id(.:format) posts#update
DELETE /topics/:topic_id/posts/:id(.:format) posts#destroy
topics GET /topics(.:format) topics#index
POST /topics(.:format) topics#create
new_topic GET /topics/new(.:format) topics#new
edit_topic GET /topics/:id/edit(.:format) topics#edit
topic GET /topics/:id(.:format) topics#show
PUT /topics/:id(.:format) topics#update
DELETE /topics/:id(.:format) topics#destroy
topic_tag GET /topics/tag/:tag(.:format) topics#index
resource_tag GET /resources/tag/:tag(.:format) resources#index
root / home#index
new_user_session GET /users/login(.:format) devise/sessions#new
user_session POST /users/login(.:format) devise/sessions#create
destroy_user_session DELETE /users/logout(.:format) devise/sessions#destroy
user_omniauth_authorize /users/auth/:provider(.:format) devise/omniauth_callbacks#passthru {:provider=>/facebook/}
user_omniauth_callback /users/auth/:action/callback(.:format) devise/omniauth_callbacks#(?-mix:facebook)
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
rails_admin /admin RailsAdmin::Engine
Routes for RailsAdmin::Engine:
dashboard GET / rails_admin/main#dashboard
index GET|POST /:model_name(.:format) rails_admin/main#index
new GET|POST /:model_name/new(.:format) rails_admin/main#new
export GET|POST /:model_name/export(.:format) rails_admin/main#export
bulk_delete POST|DELETE /:model_name/bulk_delete(.:format) rails_admin/main#bulk_delete
history_index GET /:model_name/history(.:format) rails_admin/main#history_index
bulk_action POST /:model_name/bulk_action(.:format) rails_admin/main#bulk_action
show GET /:model_name/:id(.:format) rails_admin/main#show
edit GET|PUT /:model_name/:id/edit(.:format) rails_admin/main#edit
delete GET|DELETE /:model_name/:id/delete(.:format) rails_admin/main#delete
history_show GET /:model_name/:id/history(.:format) rails_admin/main#history_show
show_in_app GET /:model_name/:id/show_in_app(.:format) rails_admin/main#show_in_app
以下是我安装rails_admin的方法：
rails g rails_admin:install
SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
This poses a security threat. It is strongly recommended that you
provide a secret to prevent exploits that may be possible from crafted
cookies. This will not be supported in future versions of Rack, and
future versions will even invalidate your existing user cookies.
Called from: /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/actionpack-3.2.9/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.
- Hello, RailsAdmin installer will help you set things up!
- I need to work with Devise, let's look at a few things first:
- Checking for a current installation of devise...
- Found it!
- Looks like you've already installed it, good!
? Where do you want to mount rails_admin? Press <enter> for [admin] > manage
gsub config/routes.rb
route mount RailsAdmin::Engine => '/manage', :as => 'rails_admin'
- And you already set it up, good! We just need to know about your user model name...
- We found 'user' (should be one of 'user', 'admin', etc.)
? Correct Devise model name if needed. Press <enter> for [user] > User
- Now setting up devise with user model name 'User':
generate devise
SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
This poses a security threat. It is strongly recommended that you
provide a secret to prevent exploits that may be possible from crafted
cookies. This will not be supported in future versions of Rack, and
future versions will even invalidate your existing user cookies.
Called from: /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/actionpack-3.2.9/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.
invoke active_record
create db/migrate/20130214195616_add_devise_to_users.rb
insert app/models/user.rb
route devise_for :users
- Now you'll need an initializer...
- You already have a config file. You're updating, heh? I'm generating a new 'rails_admin.rb.example' that you can review.
create config/initializers/rails_admin.rb.example
/Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in `block in source_reflection': undefined method `klass' for nil:NilClass (NoMethodError)
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in `collect'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in `source_reflection'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activerecord-3.2.9/lib/active_record/reflection.rb:375:in `rescue in foreign_key'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activerecord-3.2.9/lib/active_record/reflection.rb:373:in `foreign_key'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/adapters/active_record.rb:292:in `association_foreign_key_lookup'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/adapters/active_record.rb:72:in `block in associations'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/adapters/active_record.rb:65:in `map'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/adapters/active_record.rb:65:in `associations'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields/factories/association.rb:6:in `block in <top (required)>'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:54:in `call'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:54:in `block (2 levels) in factory'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:54:in `each'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:54:in `find'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:54:in `block in factory'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:50:in `each'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/fields.rb:50:in `factory'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/has_fields.rb:130:in `_fields'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/has_fields.rb:128:in `_fields'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/has_fields.rb:108:in `all_fields'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/rails_admin/config/has_fields.rb:83:in `fields'
from (erb):64:in `block in template'
from (erb):53:in `map'
from (erb):53:in `template'
from /Users/iyerushalmi/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/erb.rb:838:in `eval'
from /Users/iyerushalmi/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/erb.rb:838:in `result'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/file_manipulation.rb:117:in `block in template'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:54:in `call'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:54:in `render'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:63:in `block (2 levels) in invoke!'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:63:in `open'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:63:in `block in invoke!'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/empty_directory.rb:133:in `call'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/empty_directory.rb:133:in `invoke_with_conflict_check'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:61:in `invoke!'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions.rb:95:in `action'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/create_file.rb:26:in `create_file'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/actions/file_manipulation.rb:116:in `template'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/rails_admin-0.4.4/lib/generators/rails_admin/install_generator.rb:66:in `install'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/task.rb:27:in `run'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/invocation.rb:120:in `invoke_task'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/invocation.rb:126:in `block in invoke_all'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/invocation.rb:126:in `each'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/invocation.rb:126:in `map'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/invocation.rb:126:in `invoke_all'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/group.rb:238:in `dispatch'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/thor-0.17.0/lib/thor/base.rb:434:in `start'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/railties-3.2.9/lib/rails/generators.rb:171:in `invoke'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/railties-3.2.9/lib/rails/commands/generate.rb:12:in `<top (required)>'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `block in require'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:236:in `load_dependency'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
from /Users/iyerushalmi/.rvm/gems/ruby-1.9.3-p374/gems/railties-3.2.9/lib/rails/commands.rb:29:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
答案 0 :(得分：5)
编辑：找到修复程序。请参阅this SO discussion。
进入主ApplicationController并更改
rescue_from CanCan::AccessDenied do |e|
redirect_to root_path, alert: e.message
end
到
rescue_from CanCan::AccessDenied do |e|
redirect_to '/', alert: e.message
end
赋予任何符号路径名称将导致RoutingException，因为Rails正在错误的路由表中查找名称。指定文字根路径会绕过查找，并在处理它时为主应用程序的ApplicationController提供第一个破解。这就是你想要的。
hr下方的原帖：
我遇到了类似的错误，如果非管理员用户访问我的'/ admin'路由，那么ActiveAdmin + CanCan会尝试将他踢出去。 （顺便说一下，通过添加better_errors Gem，您可以获得更清晰的错误报告。）我收到异常报告，我可以在路由失败发生时在本地变量中看到正确的错误消息。
我还可以看到，感谢better_errors的“live shell”，生成RoutingError的ActionController是RailsAdmin::MainController。这告诉我，我们需要弄清楚如何告诉RailsAdmin重定向到应用程序根路径，而不是引擎根路径。
答案 1 :(得分：1)
您的路由无法正常工作的原因是您已注入
mount RailsAdmin::Engine => '/admin', :as => 'rails_admin'
位于routes.rb文件的底部。了解路线从上到下优先考虑。当路由到网址时，它将从列表顶部开始并向下移动。一旦发现匹配的路线，Rails就会将其发送给相应的控制器并采取行动。
通常，我发现最好将第三方API移到API列表的顶部。如果最终出现冲突问题，我可以更改自己创建的路线。更容易处理。
所以将Devise和RailsAdmin路线移到顶部并告诉我们你得到了什么。
答案 2 :(得分：0)
尝试将设计和管理路线移动到路线文件的顶部。
答案 3 :(得分：0)
我遇到了同样的问题，但只有在我使用我的用户模型登录时才会出现问题。如果我没有登录，则重定向到我的sign_in页面。
<强>更新
我发生的事情是我的用户模型不允许:manage仪表板访问的资源。
我加入此授权后，管理面板就可以了。
答案 4 :(得分：0)
使用main_app中的routes.rb来引用主要应用路由，如documentation中所述。
class ApplicationController < ActionController::Base
rescue_from CanCan::AccessDenied do |exception|
redirect_to main_app.root_path, :alert => exception.message
end
end