私は最近開始したプロジェクトで、データベースにmongoidを使用し、それを管理するためにrails_adminを使用しています。今、APIが必要で、rails-apiを選択しましたが、何らかの理由で、railsを追加したばかりです- gemファイルへのAPI、管理者にアクセスできず、常にこのエラーが発生します
Devise :: SessionsController＃newのNoMethodError
nil：NilClassの未定義のメソッド `[]'
そしてここにトレースがあります
warden（1.1.1）lib / warden / session_serializer.rb：29：in fetch'
warden (1.1.1) lib/warden/proxy.rb:196:inuser'warden（1.1.1）lib / warden / proxy.rb：293：in _perform_authentication'
warden (1.1.1) lib/warden/proxy.rb:90:inauthenticate' warden（1.1.1）lib / warden/proxy。 rb：100：in authenticate?'
devise (2.1.0) app/controllers/devise_controller.rb:113:inrequire_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:inrun_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:inprocess_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:inblock in Instrument' activesupport（3.2.5）lib / active_support /otifications/instrumenter .rb：20：instrument'
activesupport (3.2.5) lib/active_support/notifications.rb:123:inインストルメントのアクションパック（3.2.5）lib / action_controller / metal / Instruments.rb：29：inprocess_action'
actionpack (3.2.5) lib/action_controller/metal/params_wrapper.rb:206:inprocess_action'actionpack（3.2.5）lib / abstract_controller / base.rb：121：in process'
actionpack (3.2.5) lib/abstract_controller/rendering.rb:45:inprocess' actionpack（3.2.5）lib / action_controller / metal.rb：203：in dispatch'
actionpack (3.2.5) lib/action_controller/metal/rack_delegation.rb:14:indispatch'actionpack（3.2.5）lib / action_controller / metal.rb：246：in call'actionpack block in action'
actionpack (3.2.5) lib/action_dispatch/routing/route_set.rb:73:in（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:incall' actionpack（3.2.5）lib / action_dispatch / routing / mapper.rb：42：in call'
journey (1.0.3) lib/journey/router.rb:68:inblock in call'journey（1.0.3）lib / journal / router.rb：56：in each'
journey (1.0.3) lib/journey/router.rb:56:incall' actionpack（3.2.5）lib / action_dispatch / routing / route_set.rb：600：in call'
rack-pjax (0.5.9) lib/rack/pjax.rb:12:incall'mongoid（2.4.10）lib /rack/mongoid/middleware/identity_map.rb:33:in block in call'
mongoid (2.4.10) lib/mongoid.rb:133:inunit_of_work'mongoid（2.4.10）lib / Rack / mongoid / middleware / entity_map.rb：33：in call'
warden (1.1.1) lib/warden/manager.rb:35:inblock in call' warden（1.1.1）lib / warden /manager.rb:34:incatch'
warden (1.1.1) lib/warden/manager.rb:34:incall'rack（1.4.1）lib / Rack / etag.rb：23：in call'
rack (1.4.1) lib/rack/conditionalget.rb:25:incall' actionpack（3.2.5）lib / action_dispatch / Middleware / head.rb：14：in call'actionpack call'
remotipart (1.0.2) lib/remotipart/middleware.rb:30:in（3.2.5）lib / action_dispatch / Middleware / params_parser.rb：21：in call'
actionpack (3.2.5) lib/action_dispatch/middleware/callbacks.rb:28:inblock 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：_run_call_callbacks'
activesupport (3.2.5) lib/active_support/callbacks.rb:81:inrun_callbacksのアクションパック（3.2.5）lib / action_dispatch / middleware / callbacks.rb：27：in call'actionpack call'
actionpack (3.2.5) lib/action_dispatch/middleware/reloader.rb:65:in（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:incall'アクションパック（3.2.5 ）lib / action_dispatch / middleware / show_exceptions.rb：56：in call'
railties (3.2.5) lib/rails/rack/logger.rb:26:incall_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:incall' Rack（1.4.1）lib / Rack / runtime.rb ：17：incall'
activesupport (3.2.5) lib/active_support/cache/strategy/local_cache.rb:72:incall'rack（1.4.1）lib / Rack / lock.rb：15：in call'
actionpack (3.2.5) lib/action_dispatch/middleware/static.rb:62:incall' railties（3.2.5）lib / rails / engine.rb：479：in call'rack call'
railties (3.2.5) lib/rails/application.rb:220:in（1.4.1）lib / Rack / content_length.rb：14：in call'
railties (3.2.5) lib/rails/rack/log_tailer.rb:17:incall'rack（1.4.1）lib / Rack / handler / webrick.rb：59：in `service'
私はこれを引き起こすこれらの宝石の間で何が起こっているのか本当にわかりません、どんなアドバイスや指示も歓迎します;）