I'm somewhat confused by the following LoadError.
LoadError - Unable to autoload constant ApplicationController, expected /opt/rails/production/current/app/controllers/application_controller.rb to define it:
activesupport (4.2.4) lib/active_support/dependencies.rb:495:in `load_missing_constant'
activesupport (4.2.4) lib/active_support/dependencies.rb:184:in `const_missing'
app/controllers/display_controller.rb:3:in `<top (required)>'
activesupport (4.2.4) lib/active_support/dependencies.rb:457:in `block in load_file'
activesupport (4.2.4) lib/active_support/dependencies.rb:647:in `new_constants_in'
activesupport (4.2.4) lib/active_support/dependencies.rb:456:in `load_file'
activesupport (4.2.4) lib/active_support/dependencies.rb:354:in `require_or_load'
activesupport (4.2.4) lib/active_support/dependencies.rb:494:in `load_missing_constant'
activesupport (4.2.4) lib/active_support/dependencies.rb:184:in `const_missing'
activesupport (4.2.4) lib/active_support/inflector/methods.rb:261:in `block in constantize'
activesupport (4.2.4) lib/active_support/inflector/methods.rb:259:in `constantize'
activesupport (4.2.4) lib/active_support/dependencies.rb:566:in `get'
activesupport (4.2.4) lib/active_support/dependencies.rb:597:in `constantize'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:72:in `controller_reference'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:62:in `controller'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:41:in `serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in `call'
meta_request (0.3.4) lib/meta_request/middlewares/app_request_handler.rb:13:in `call'
meta_request (0.3.4) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call'
bullet (4.14.7) lib/bullet/rack.rb:12:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:25:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.2.4) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.2.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.4) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
better_errors (1.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (1.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (1.1.0) lib/better_errors/middleware.rb:56:in `call'
rack-contrib (1.4.0) lib/rack/contrib/response_headers.rb:17:in `call'
meta_request (0.3.4) lib/meta_request/middlewares/headers.rb:16:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
web-console (2.2.1) lib/web_console/middleware.rb:39:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.4) lib/rails/rack/logger.rb:22:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
railties (4.2.4) lib/rails/engine.rb:518:in `call'
railties (4.2.4) lib/rails/application.rb:165:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
rack (1.6.4) lib/rack/content_length.rb:15:in `call'
rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
/home/production/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/home/production/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/home/production/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
I've limited my controller to just a method and it still does this, so its not related to the code in the controller.
Here's the routes for it:
namespace :display do
get :delivery
end
Here are the development options:
config.cache_classes = false
config.eager_load = false
# Show full error reports and disable caching
config.consider_all_requests_local = true
config.action_controller.perform_caching = false
# Don't care if the mailer can't send
config.action_mailer.raise_delivery_errors = false
# Print deprecation notices to the Rails logger
config.active_support.deprecation = :log
config.assets.js_compressor = :uglifier
config.serve_static_files = true
config.action_dispatch.cookies_serializer = :hybrid
config.active_record.raise_in_transactional_callbacks = true
Here is my ApplicationController
class ApplicationController < ActionController::Base
include AuthenticatedSystem
helper :all
unloadable
protect_from_forgery
rescue_from ActionController::InvalidAuthenticityToken, :with => :bad_token
def fail
raise "Well, that was exciting."
end
private
def bad_token
flash[:notice] = "Your session has expired."
redirect_to :controller => :account, :action => :login
end
def authorize_edit
authorized! "Edit " + @project.data_type
end
def authorize_view
authorized! "View " + @project.data_type
end
def set_project
@project = Project.find_by(id: params[:project_id])
end
end
This occurs with various controllers, and consistently always right after I make a change in code. It doesn't seem to matter where the change occurs (e.g. controllers or models). My only remedy is to restart the server every time I make a code change – very frustrating.
Other SO posts related to this recommend pluralizing the controller, but here a plural controller does not make sense, besides which, I've tried that and it doesn't work. Besides, the auto loader just requires the filename to match the module/class name right?
My problem is I'm just not sure what to fix based on the LoadError message in the stack trace.
This seems related to how active support handles auto loading, I'm tempted to upgrade from Rails 4.2.4, to 4.2.5, but I'm not convinced that'll resolve this.
How can I avoid this LoadError?
The use of unloadable in ApplicationController causes the controller class to be unloaded, and apparently not properly auto loaded again after something has changed in the development environment.
Everything inside app/ is already unloadable by default and doesn't require the explicit call.
For more information, look at this issue in the Rails repository on Github.