rails_admin与rails-api冲突

Question

我有一个最近开始的项目，我正在使用mongoid进行数据库和rails_admin来管理它，现在我想要一个api并且我选择了rails-api来做它，但出于某种原因，因为我只是将rails-api添加到gem文件中，我无法访问管理员，我总是得到这个错误

Devise中的NoMethodError :: SessionsController #new

未定义的方法`[]'为nil：NilClass

这是跟踪

warden（1.1.1）lib / warden / session_serializer.rb:29:in fetch' warden (1.1.1) lib/warden/proxy.rb:196:in user' warden（1.1.1）lib / warden / proxy.rb:293：in _perform_authentication' warden (1.1.1) lib/warden/proxy.rb:90:in authenticate' warden（1.1.1）lib / warden / proxy.rb：100：in authenticate?' devise (2.1.0) app/controllers/devise_controller.rb:113:in require_no_authentication' activesupport（3.2.5）lib / active_support / callbacks.rb：407：in _run__3280997315660744487__process_action__4533000551616940901__callbacks' activesupport (3.2.5) lib/active_support/callbacks.rb:405:in __ run_callback' activesupport（3.2.5）lib / active_support / callbacks.rb：385：in _run_process_action_callbacks' activesupport (3.2.5) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack（3.2.5）lib / abstract_controller / callbacks.rb:17:in process_action' actionpack (3.2.5) lib/action_controller/metal/rescue.rb:29:in process_action' actionpack（3.2.5）lib / action_controller / metal / instrumentation.rb：30：in block in process_action' activesupport (3.2.5) lib/active_support/notifications.rb:123:in block in instrument' activesupport（3.2.5）lib / active_support / notifications / instrumenter.rb：20：in instrument' activesupport (3.2.5) lib/active_support/notifications.rb:123:in instrument' actionpack（3.2.5）lib / action_controller / metal / instrumentation.rb：29：in process_action' actionpack (3.2.5) lib/action_controller/metal/params_wrapper.rb:206:in process_action' actionpack（3.2.5）lib / abstract_controller / base.rb：121：in process' actionpack (3.2.5) lib/abstract_controller/rendering.rb:45:in process' actionpack（3.2.5）lib / action_controller / metal.rb：203：in dispatch' actionpack (3.2.5) lib/action_controller/metal/rack_delegation.rb:14:in dispatch' actionpack（3.2.5）lib / action_controller / metal.rb：246：in block in action' actionpack (3.2.5) lib/action_dispatch/routing/route_set.rb:73:in call' actionpack（3.2.5）lib / action_dispatch / routing / route_set.rb:73:in dispatch' actionpack (3.2.5) lib/action_dispatch/routing/route_set.rb:36:in call' actionpack（3.2.5）lib / action_dispatch / routing / mapper.rb：42：in call' journey (1.0.3) lib/journey/router.rb:68:in block in call' 旅程（1.0.3）lib / journey / router.rb：56：in each' journey (1.0.3) lib/journey/router.rb:56:in call' actionpack（3.2.5）lib / action_dispatch / routing / route_set.rb：600：in call' rack-pjax (0.5.9) lib/rack/pjax.rb:12:in call' mongoid（2.4.10）lib / rack / mongoid / middleware / identity_map.rb:33:in block in call' mongoid (2.4.10) lib/mongoid.rb:133:in unit_of_work' mongoid（2.4.10）lib / rack / mongoid / middleware / identity_map.rb:33:in call' warden (1.1.1) lib/warden/manager.rb:35:in block in call' warden（1.1.1）lib / warden / manager.rb:34:in catch' warden (1.1.1) lib/warden/manager.rb:34:in call' rack（1.4.1）lib / rack / etag.rb:23:in call' rack (1.4.1) lib/rack/conditionalget.rb:25:in call' actionpack（3.2.5）lib / action_dispatch / middleware / head.rb:14:in call' remotipart (1.0.2) lib/remotipart/middleware.rb:30:in call' actionpack（3.2.5）lib / action_dispatch / middleware / params_parser.rb：21：in call' actionpack (3.2.5) lib/action_dispatch/middleware/callbacks.rb:28:in block in call' activesupport（3.2.5）lib / active_support / callbacks.rb：405：in _run__2911892753477349565__call__1112249857594481255__callbacks' activesupport (3.2.5) lib/active_support/callbacks.rb:405:in __ run_callback' activesupport（3.2.5）lib / active_support / callbacks.rb：385：in _run_call_callbacks' activesupport (3.2.5) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack（3.2.5）lib / action_dispatch / middleware / callbacks.rb:27:in call' actionpack (3.2.5) lib/action_dispatch/middleware/reloader.rb:65:in call' actionpack（3.2.5）lib / action_dispatch / middleware / remote_ip.rb:31:in call' actionpack (3.2.5) lib/action_dispatch/middleware/debug_exceptions.rb:16:in call' actionpack（3.2.5）lib / action_dispatch / middleware / show_exceptions.rb:56:in call' railties (3.2.5) lib/rails/rack/logger.rb:26:in call_app' railties（3.2.5）lib / rails / rack / logger.rb:16:in call' actionpack (3.2.5) lib/action_dispatch/middleware/request_id.rb:22:in call' rack（1.4.1）lib / rack / runtime.rb:17:in call' activesupport (3.2.5) lib/active_support/cache/strategy/local_cache.rb:72:in call' rack（1.4.1）lib / rack / lock.rb:15:in call' actionpack (3.2.5) lib/action_dispatch/middleware/static.rb:62:in call' railties（3.2.5）lib / rails / engine.rb：479：in call' railties (3.2.5) lib/rails/application.rb:220:in call' rack（1.4.1）lib / rack / content_length.rb:14:in call' railties (3.2.5) lib/rails/rack/log_tailer.rb:17:in call' rack（1.4.1）lib / rack / handler / webrick.rb：59：in“service”

我真的不知道造成这种情况的宝石之间发生了什么，欢迎任何建议或指示;）

Answer 1

我遇到了同样的问题，我发现Warden需要两个在API应用程序中默认不存在的中间件：ActionDispatch :: Session :: CookieStore和ActionDispatch :: Cookies。

因此，可以通过以下方式添加这些中间件：
#config/application.rb
config.middleware.use ActionDispatch::Cookies
config.middleware.use ActionDispatch::Session::CookieStore