Ruby on rails ArgumentError:ApplicationController的副本已从模块树中删除，但仍处于活动状态

我正在使用ActiveAdmin（针对Rails 4定制gemset）和Rails 4.0.0.rc2。应用程序还具有基于railscasts和的定制授权代码

当我更改ActiveAdmin资源文件中的某些内容并尝试刷新浏览器页面时，我在

当前\u权限

方法中遇到此错误：

位于/admin/courses的ArgumentError

ApplicationController的副本已从模块树中删除，但仍处于活动状态

如果我再次尝试刷新，我会得到：

自动加载固定权限时检测到循环依赖关系

我认为这个问题与源文件更改后在开发模式下自动加载类有关。我见过类似的问题帖子，但它们是针对Rails2.3.x的。此外，解决方案似乎是在抛出此错误的控制器中指定

unloadable

，但我不确定在ActiveAdmin中将此代码段放在何处

这可能与ActiveAdmin也没有任何关系。它可能是关于如何构建Permissions类及其在应用程序控制器中的使用。如果我在ActiveAdmin资源类中添加一个

skip\u before\u filter:authorize

，此错误将消失

应用程序控制器：

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  before_filter :authenticate_user!
  before_filter :authorize

  delegate :allow_action?, to: :current_permission
  helper_method :allow_action?

  delegate :allow_param?, to: :current_permission
  helper_method :allow_param?

  private
    def current_permission
      @current_permission ||= Permissions.permission_for(current_user)
    end

    def current_resource
      nil
    end

    def authorize
      if current_permission.allow_action?(params[:controller], params[:action], current_resource)
        current_permission.permit_params! params
      else
        redirect_to root_url, alert: "Not authorized."
      end
    end
end

管理员/courses.rb：

ActiveAdmin.register Course do
  index do
    column :name
    column :description
    column :duration
    column :status
    column :price
    default_actions
  end

  filter :discipline
  filter :level
  filter :lessons
  filter :name
  filter :status
end

Gemfile（相关行）：

参数错误：

ArgumentError - A copy of ApplicationController has been removed from the module tree but is still active!:
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:445:in `load_missing_constant'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:183:in `const_missing'
  rspec-core (2.13.1) lib/rspec/core/backward_compatibility.rb:24:in `const_missing'
  app/controllers/application_controller.rb:17:in `current_permission'
  app/controllers/application_controller.rb:25:in `authorize'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:417:in `_run__1040990970961152968__process_action__callbacks'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.0.rc2) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (4.0.0.rc2) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.0.0.rc2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
  activesupport (4.0.0.rc2) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.0.0.rc2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.0.0.rc2) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.0.0.rc2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.0.0.rc2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
  activerecord (4.0.0.rc2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.0.0.rc2) lib/abstract_controller/base.rb:136:in `process'
  actionpack (4.0.0.rc2) lib/abstract_controller/rendering.rb:44:in `process'
  actionpack (4.0.0.rc2) lib/action_controller/metal.rb:195:in `dispatch'
  actionpack (4.0.0.rc2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.0.0.rc2) lib/action_controller/metal.rb:231:in `block in action'
  actionpack (4.0.0.rc2) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
  actionpack (4.0.0.rc2) lib/action_dispatch/routing/route_set.rb:48:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.0.0.rc2) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/routing/route_set.rb:655:in `call'
  omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
  omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
  omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
  omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
  omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
  omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
  newrelic_rpm (3.6.4.122) lib/new_relic/rack/error_collector.rb:12:in `call'
  newrelic_rpm (3.6.4.122) lib/new_relic/rack/agent_hooks.rb:22:in `call'
  newrelic_rpm (3.6.4.122) lib/new_relic/rack/browser_monitoring.rb:16:in `call'
  newrelic_rpm (3.6.4.122) lib/new_relic/rack/developer_mode.rb:28:in `call'
  meta_request (0.2.7) lib/meta_request/middlewares/app_request_handler.rb:13:in `call'
  rack-contrib (1.1.0) lib/rack/contrib/response_headers.rb:17:in `call'
  meta_request (0.2.7) lib/meta_request/middlewares/headers.rb:16:in `call'
  meta_request (0.2.7) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call'
  warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.1) 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.rc2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.0.0.rc2) 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.rc2) lib/action_dispatch/middleware/cookies.rb:486:in `call'
  activerecord (4.0.0.rc2) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.0.0.rc2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
  activerecord (4.0.0.rc2) lib/active_record/migration.rb:369:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:373:in `_run__2183739952227501342__call__callbacks'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/reloader.rb:64:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:56:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:21:in `block in call'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:67:in `block in tagged'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:25:in `tagged'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:67:in `tagged'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:21:in `call'
  actionpack (4.0.0.rc2) 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.rc2) 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.rc2) lib/action_dispatch/middleware/static.rb:64:in `call'
  railties (4.0.0.rc2) lib/rails/engine.rb:511:in `call'
  railties (4.0.0.rc2) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  puma (2.1.1) lib/puma/server.rb:369:in `handle_request'
  puma (2.1.1) lib/puma/server.rb:246:in `process_client'
  puma (2.1.1) lib/puma/server.rb:145:in `block in run'
  puma (2.1.1) lib/puma/thread_pool.rb:92:in `block in spawn_thread'

运行时错误：循环依赖项：

RuntimeError - Circular dependency detected while autoloading constant Permissions:
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:460:in `load_missing_constant'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:183:in `const_missing'
  rspec-core (2.13.1) lib/rspec/core/backward_compatibility.rb:24:in `const_missing'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:686:in `remove_constant'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:516:in `block in remove_unloadable_constants!'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:516:in `remove_unloadable_constants!'
  activesupport (4.0.0.rc2) lib/active_support/dependencies.rb:300:in `clear'
  railties (4.0.0.rc2) lib/rails/application/finisher.rb:90:in `block (2 levels) in <module:Finisher>'
  activesupport (4.0.0.rc2) lib/active_support/file_update_checker.rb:75:in `execute'
  railties (4.0.0.rc2) lib/rails/application/finisher.rb:105:in `block (2 levels) in <module:Finisher>'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:377:in `_run__2753119820186226816__prepare__callbacks'
  activesupport (4.0.0.rc2) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/reloader.rb:74:in `prepare!'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/reloader.rb:62:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
  better_errors (0.9.0) lib/better_errors/middleware.rb:56:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.0.0.rc2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:21:in `block in call'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:67:in `block in tagged'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:25:in `tagged'
  activesupport (4.0.0.rc2) lib/active_support/tagged_logging.rb:67:in `tagged'
  railties (4.0.0.rc2) lib/rails/rack/logger.rb:21:in `call'
  actionpack (4.0.0.rc2) 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.rc2) 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.rc2) lib/action_dispatch/middleware/static.rb:64:in `call'
  railties (4.0.0.rc2) lib/rails/engine.rb:511:in `call'
  railties (4.0.0.rc2) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  puma (2.1.1) lib/puma/server.rb:369:in `handle_request'
  puma (2.1.1) lib/puma/server.rb:246:in `process_client'
  puma (2.1.1) lib/puma/server.rb:145:in `block in run'
  puma (2.1.1) lib/puma/thread_pool.rb:92:in `block in spawn_thread'

RuntimeError-自动加载常量权限时检测到循环依赖项：
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:460:in'load\u missing\u constant'
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:183:in'const\u missing'
rspec核心（2.13.1）lib/rspec/core/backward_兼容性。rb:24:in'const_missing'
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:686:in'remove\u constant'
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:516:in`block in remove\u unloadable\u constants！'
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:516:in`remove\u unloadable\u constants！'
activesupport（4.0.0.rc2）lib/active\u support/dependencies.rb:300:in'clear'
railties（4.0.0.rc2）lib/rails/application/finisher.rb:90:in“block（2层）in”
activesupport（4.0.0.rc2）lib/active\u support/file\u update\u checker.rb:75:in'execute'
railties（4.0.0.rc2）lib/rails/application/finisher.rb:105:in“block（2层）in”
activesupport（4.0.0.rc2）lib/active\u support/callbacks.rb:377:in`“运行\u 2753119820186226816\u准备\u回调”
activesupport（4.0.0.rc2）lib/active\u support/callbacks.rb:80:in'run\u callbacks'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/reloader.rb:74:in'prepare！'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/reloader.rb:62:in'call'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/remote\u ip.rb:76:in'call'
better_errors（0.9.0）lib/better_errors/middleware.rb:84:in'protected_app_call'
better_errors（0.9.0）lib/better_errors/middleware.rb:79:in'better_errors_call'
better_errors（0.9.0）lib/better_errors/middleware.rb:56:in'call'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/debug\u exceptions.rb:17:in'call'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/show\u exceptions.rb:30:in'call'
railties（4.0.0.rc2）lib/rails/rack/logger.rb:38:in'call_app'
railties（4.0.0.rc2）lib/rails/rack/logger.rb:21:in'block-in-call'
activesupport（4.0.0.rc2）lib/active\u support/taged\u logging.rb:67:in'block in taged'
activesupport（4.0.0.rc2）lib/active\u support/taged\u logging.rb:25:in'taged'
activesupport（4.0.0.rc2）lib/active\u support/taged\u logging.rb:67:in'taged'
railties（4.0.0.rc2）lib/rails/rack/logger.rb:21:in'call'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/request\u 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.rc2）lib/active\u support/cache/strategy/local\u cache.rb:83:in'call'
机架（1.5.2）lib/rack/lock.rb:17:in'call'
actionpack（4.0.0.rc2）lib/action\u dispatch/middleware/static.rb:64:in'call'
railties（4.0.0.rc2）lib/rails/engine.rb:511:in'call'
railties（4.0.0.rc2）lib/rails/application.rb:97:in'call'
机架（1.5.2）lib/rack/content_length.rb:14:in'call'
puma（2.1.1）lib/puma/server.rb:369:in'handle_request'
puma（2.1.1）lib/puma/server.rb:246:in'process\u client'
puma（2.1.1）lib/puma/server.rb:145:in'block in run'
puma（2.1.1）lib/puma/thread_pool.rb:92:in`block in spawn_thread'

任何线索都会有帮助。

---

如果您需要查看应用程序中的其他代码片段，请告诉我。

我没有使用ActiveAdmin，但我刚刚体验到与ApplicationController的循环依赖关系

问题在于助手模块的声明不正确：

app/helpers/home_helper.rb

被宣布为：

module StaticHelper

---

修好后，一切都很美好。我没有研究发生这种情况的原因，Rails也没有返回更智能的错误消息。

我不确定发生这种情况的确切原因，但我找到了一个解决方法。更改此项：

def current_permission
  @current_permission ||= Permissions.permission_for(current_user)
end

为此：

def current_permission
  @current_permission ||= ::Permissions.permission_for(current_user)
end

出现以下错误：

---

这个问题只有在您没有完全限定常量名称时才会出现，因此Rails会尝试在

ApplicationController

名称空间中查找它。

对于未来的访问者，我想我会对原始问题进行一些澄清，尽管这个问题已经很老了，并且已经有了一个公认的答案

---

ArgumentError:X的副本已从模块树中删除，但仍处于活动状态。当您试图从未自动重新加载的类（在lib目录中）访问自动重新加载的类（在应用程序目录中）时，会引发该错误。

在您的development.rb中暂时尝试放置

config.cache_classes = true

---

这对我很有用。

你可以试着把这一行放在你的

配置/initializers/active_admin.rb中：

在轨=
def current_permission
  @current_permission ||= ::Permissions.permission_for(current_user)
end

# Load the constant named +const_name+ which is missing from +from_mod+. If
# it is not possible to load the constant into from_mod, try its parent
# module using +const_missing+.
def load_missing_constant(from_mod, const_name)
  log_call from_mod, const_name

  unless qualified_const_defined?(from_mod.name) && Inflector.constantize(from_mod.name).equal?(from_mod)
    raise ArgumentError, "A copy of #{from_mod} has been removed from the module tree but is still active!"
  end
  # ...
end

config.cache_classes = true

 config.skip_before_filter :load_footer_variables

config.skip_before_action :load_footer_variables

ArgumentError at /admin/dashboard

A copy of ApplicationController has been removed from the module tree but is still active!