ArgumentError: una copia di ApplicationController è stata rimossa dall'albero dei moduli ma è ancora attiva

Question

Sto utilizzando ActiveAdmin (con gemset personalizzato per Rails 4) con Rails 4.0.0.rc2. L'applicazione dispone anche di un codice di autorizzazione personalizzato basato sui railscast #385 e #386.

Quando cambio qualcosa in un file di risorse ActiveAdmin e cerco di aggiornare la pagina del browser, ottengo questo errore al metodo di current_permission:

ArgumentError at /admin/courses

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

Se provo di nuovo un aggiornamento, ottengo:

Circular dependency detected while autoloading constant Permissions

Penso che questo problema abbia a che fare con il caricamento automatico delle classi in modalità sviluppo, dopo una modifica nel file sorgente. Ho visto post di problemi simili, ma sono per binari 2.3.x. Inoltre, la soluzione sembra specificare unloadable nel controller che genera questo errore, ma non sono sicuro di dove inserire questo snippet in ActiveAdmin.

Questo potrebbe non avere nulla a che fare con ActiveAdmin. Potrebbe riguardare il modo in cui è stata creata la classe Autorizzazioni e il relativo utilizzo all'interno di Application Controller. Se aggiungo uno skip_before_filter :authorize nella classe di risorse ActiveAdmin, questo errore si annulla.

ApplicationController:

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 

Permissions.rb:

module Permissions 
    def self.permission_for(user) 
    if user.nil? 
     GuestPermission.new 
    elsif user.admin? 
     AdminPermission.new(user) 
    else 
     UserPermission.new(user) 
    end 
    end 
end 

admin/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 (linee interessate):

gem 'rails', '4.0.0.rc2' 

# Use puma as the app server 
gem 'puma' 

# Administration - Temporary github refs until rails 4 compatible releases 
gem 'responders',   github: 'plataformatec/responders' 
gem 'inherited_resources', github: 'josevalim/inherited_resources' 
gem 'ransack',    github: 'ernie/ransack',   branch: 'rails-4' 
gem 'activeadmin',   github: 'gregbell/active_admin', branch: 'rails4' 
gem 'formtastic',   github: 'justinfrench/formtastic' 

.210

ArgumentError:

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' 

RuntimeError: circolare di dipendenza:

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' 

Qualsiasi indizio aiuterà. Fammi sapere se è necessario visualizzare altri frammenti di codice nell'applicazione.

Answer 1

Non so esattamente perché questo sta accadendo, ma ho trovato un lavoro.Modificare questa:

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

A tal:

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

L'errore viene generato at this point in ActiveSupport:

# 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 

Il problema si verifica solo quando non si qualificano pienamente il nome della costante, in modo da Rails prova a cercarlo nello spazio dei nomi ApplicationController.

Answer 2

Non sto utilizzando ActiveAdmin, ma ho appena sperimentato una dipendenza circolare con ApplicationController.

Il problema era un modulo helper è stata dichiarata in modo improprio:

app/helpers/home_helper.rb 

è stato dichiarato con:

module StaticHelper 

Dopo aver sistemato questo, tutto era peachy. Non ho cercato perché questo è accaduto e Rails non ha restituito un messaggio di errore più intelligente.

Answer 3

Per i visitatori futuri, ho pensato di fornire alcuni chiarimenti sul problema originale anche se la domanda è piuttosto vecchia e c'è già una risposta accettata.

Il ArgumentError: A copy of X has been removed from the module tree but is still active viene generato quando si tenta di accedere a una classe ricaricata automaticamente (nella directory app) da una che non viene ricaricata automaticamente (nella directory lib).

Answer 4

In te development.rb provare temporaneamente mettere

config.cache_classes = true 

Ha funzionato per me.

Answer 5

Si può provare a mettere questa riga nel vostro config/initializers/active_admin.rb:

config.skip_before_filter :load_footer_variables 

Come suggerito here.