我有这个问题，当我尝试开始启动 Rails 服务器时，我得到了这个:
=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:492:in `load_missing_constant': Circular dependency detected while autoloading constant AdminUser (RuntimeError)
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in `const_missing'
from /Users/ludvigsorensen/Desktop/BackyardCoding/app/admin/admin_user.rb:1:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:457:in `load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:457:in `block in load_file'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:647:in `new_constants_in'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:456:in `load_file'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:354:in `require_or_load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:494:in `load_missing_constant'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in `const_missing'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:261:in `const_get'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:261:in `block in constantize'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `inject'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `constantize'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:566:in `get'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:597:in `constantize'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise.rb:302:in `get'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/mapping.rb:80:in `to'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/mapping.rb:75:in `modules'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/mapping.rb:92:in `routes'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/mapping.rb:159:in `default_used_route'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/mapping.rb:69:in `initialize'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise.rb:336:in `new'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise.rb:336:in `add_mapping'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:224:in `block in devise_for'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:223:in `each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:223:in `devise_for'
from /Users/ludvigsorensen/Desktop/BackyardCoding/config/routes.rb:3:in `block in <top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `instance_exec'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `eval_block'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:401:in `draw'
from /Users/ludvigsorensen/Desktop/BackyardCoding/config/routes.rb:1:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `call'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `execute'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:27:in `updater'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `call'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
from /Users/ludvigsorensen/Desktop/backyardcoding/config/environment.rb:5:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/ludvigsorensen/Desktop/backyardcoding/config.ru:3:in `block in <main>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from /Users/ludvigsorensen/Desktop/backyardcoding/config.ru:in `new'
from /Users/ludvigsorensen/Desktop/backyardcoding/config.ru:in `<main>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/server.rb:208:in `app'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/server.rb:61:in `app'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/server.rb:139:in `log_to_stdout'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/server.rb:78:in `start'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/ludvigsorensen/Desktop/BackyardCoding/bin/rails:8:in `require'
from /Users/ludvigsorensen/Desktop/BackyardCoding/bin/rails:8:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/client/rails.rb:28:in `load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/client/rails.rb:28:in `call'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/client/command.rb:7:in `call'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/client.rb:28:in `run'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/bin/spring:49:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/binstub.rb:11:in `load'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.4.0/lib/spring/binstub.rb:11:in `<top (required)>'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /Users/ludvigsorensen/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /Users/ludvigsorensen/Desktop/backyardcoding/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
我认为这可能与 active_admin 有关，顺便说一句，这是我的 gem 文件......
source 'https://rubygems.org'
gem 'bootstrap-sass', '~> 3.3.5.1'
gem 'devise', '~> 3.4.1'
gem 'toastr-rails'
gem 'activeadmin', github: 'activeadmin'
gem 'paperclip', '~> 4.2.1'
gem 'friendly_id', '~> 5.1.0'
gem 'active_admin-sortable_tree', '~> 0.2.1'
gem 'kaminari', '~> 0.16.3'
gem 'stripe', :git => 'https://github.com/stripe/stripe-ruby'
gem 'mandrill-api', '1.0.52', require: 'mandrill'
gem 'redcarpet', '~> 3.2.3'
gem 'coderay', '~> 1.1.0'
gem 'rails', '4.2.0'
gem 'sqlite3'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
group :development, :test do
gem 'byebug'
gem 'web-console', '~> 2.0'
gem 'spring'
end
你知道我该怎么做吗？
最佳答案
所以我自己修好了。这个答案帮助了我:https://github.com/activeadmin/activeadmin/issues/2334#issuecomment-42626409
我只需要将 app/admin 目录中的模型重命名为复数，fx 和 admin_user.rb。我将 app/admin/admin_user.rb 重命名为 app/admin/admin_users.rb，然后将其他文件也重命名为复数。
关于ruby-on-rails - 启动我的 Rails 服务器时出错 : Circular dependency detected while autoloading constant AdminUser (RuntimeError)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32747846/