Rails 4 +自定義設計屬性 - ParameterSanitizer錯誤

Question

我跟着this tutorial關於添加自定義字段到我的設計用戶模型，並且一切似乎大部分工作正常。但是，有時我收到一個錯誤，當我嘗試登錄了我的申請，上面寫着這樣的：

NameError在設計:: SessionsController＃新

未初始化的常數用戶:: ParameterSanitizer

提取的源（在＃11附近）：

9 def devise_parameter_sanitizer 
10 if resource_class == User 
11  User::ParameterSanitizer.new(User, :user, params) 
12 else 
13  super 
14 end 

正如我所提到的，我的應用程序一般工作正常。有時我能夠註銷而不會收到此錯誤。它簡直讓我感到困惑！

編輯：重新啓動導軌服務器導致錯誤消息消失，但是，我正在尋找一個更永久的解決方案。

編輯：全堆棧跟蹤：

app/controllers/application_controller.rb:11:in 'devise_parameter_sanitizer' 
devise (3.2.2) app/controllers/devise/sessions_controller.rb:40:in 'sign_in_params' 
devise (3.2.2) app/controllers/devise/sessions_controller.rb:8:in 'new' 
actionpack (4.0.0) lib/action_controller/metal/implicit_render.rb:4:in 'send_action' 
actionpack (4.0.0) lib/abstract_controller/base.rb:189:in 'process_action' 
actionpack (4.0.0) lib/action_controller/metal/rendering.rb:10:in 'process_action' 
actionpack (4.0.0) lib/abstract_controller/callbacks.rb:18:in 'block in process_action' 
activesupport (4.0.0) lib/active_support/callbacks.rb:443:in '_run__1105479583300404070__process_action__callbacks' 
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in 'run_callbacks' 
actionpack (4.0.0) lib/abstract_controller/callbacks.rb:17:in 'process_action' 
actionpack (4.0.0) lib/action_controller/metal/rescue.rb:29:in 'process_action' 
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:31:in 'block in process_action' 
activesupport (4.0.0) lib/active_support/notifications.rb:159:in 'block in instrument' 
activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:in 'instrument' 
activesupport (4.0.0) lib/active_support/notifications.rb:159:in 'instrument' 
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:30:in 'process_action' 
actionpack (4.0.0) lib/action_controller/metal/params_wrapper.rb:245:in 'process_action' 
activerecord (4.0.0) lib/active_record/railties/controller_runtime.rb:18:in 'process_action' 
actionpack (4.0.0) lib/abstract_controller/base.rb:136:in 'process' 
actionpack (4.0.0) lib/abstract_controller/rendering.rb:44:in 'process' 
actionpack (4.0.0) lib/action_controller/metal.rb:195:in 'dispatch' 
actionpack (4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in 'dispatch' 
actionpack (4.0.0) lib/action_controller/metal.rb:231:in 'block in action' 
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in 'call' 
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in 'dispatch' 
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in 'call' 
actionpack (4.0.0) lib/action_dispatch/routing/mapper.rb:44:in 'call' 
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:in 'block in call' 
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in 'each' 
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in 'call' 
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655:in 'call' 
warden (1.2.3) lib/warden/manager.rb:35:in 'block in call' 
warden (1.2.3) lib/warden/manager.rb:34:in 'catch' 
warden (1.2.3) lib/warden/manager.rb:34:in 'call' 
rack (1.5.2) lib/rack/etag.rb:23:in 'call' 
rack (1.5.2) lib/rack/conditionalget.rb:25:in 'call' 
rack (1.5.2) lib/rack/head.rb:11:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:27:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:in 'call' 
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in 'context' 
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in 'call' 
activerecord (4.0.0) lib/active_record/query_cache.rb:36:in 'call' 
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in 'call' 
activerecord (4.0.0) lib/active_record/migration.rb:369:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in 'block in call' 
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in '_run__1611111079631103792__call__callbacks' 
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in 'run_callbacks' 
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/remote_ip.rb:76:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in 'call' 
railties (4.0.0) lib/rails/rack/logger.rb:38:in 'call_app' 
railties (4.0.0) lib/rails/rack/logger.rb:21:in 'block in call' 
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in 'block in tagged' 
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in 'tagged' 
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in 'tagged' 
railties (4.0.0) lib/rails/rack/logger.rb:21:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:in 'call' 
rack (1.5.2) lib/rack/methodoverride.rb:21:in 'call' 
rack (1.5.2) lib/rack/runtime.rb:17:in 'call' 
activesupport (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:in 'call' 
rack (1.5.2) lib/rack/lock.rb:17:in 'call' 
actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in 'call' 
railties (4.0.0) lib/rails/engine.rb:511:in 'call' 
railties (4.0.0) lib/rails/application.rb:97:in 'call' 
rack (1.5.2) lib/rack/lock.rb:17:in 'call' 
rack (1.5.2) lib/rack/content_length.rb:14:in 'call' 
rack (1.5.2) lib/rack/handler/webrick.rb:60:in 'service' 
/Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in 'service' 
/Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in 'run' 
/Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in 'block in start_thread' 

Answer 1

當User類修改和發展模式的自動重新加載，用戶:: ParameterSanitizer不斷被破壞。但是User :: ParameterSanitizer僅在其消毒劑初始化器中的源文件爲require'時才創建。

重命名User::ParameterSanitizer到UserParameterSanitizer，你應該沒問題。

Answer 2

我在開發中遇到了這個問題，並通過重新啓動我的本地服務器來解決它。