我发现了类似的问题，但没有一个答案解决了这个问题。我有一个现有的项目，我从v4.2.5升级到5.1.5。我想使用Site Point tutorial添加一个聊天室，但是我遇到了ActionCable的问题。每当我启动我的服务器时，它都会崩溃并出现以下错误：
/home/ubuntu/workspace/config/routes.rb:39:in `block in <top (required)>': uninitialized constant ActionCable (NameError)
from /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-4.2.5/lib/action_dispatch/routing/route_set.rb:434:in `instance_exec'
from /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-4.2.5/lib/action_dispatch/routing/route_set.rb:434:in `eval_block'
from /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-4.2.5/lib/action_dispatch/routing/route_set.rb:412:in `draw'
from /home/ubuntu/workspace/config/routes.rb:3:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:40:in `each'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /usr/local/rvm/gems/ruby-2.3.4/gems/activesupport-4.2.5/lib/active_support/file_update_checker.rb:75:in `execute'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:27:in `updater'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/initializable.rb:30:in `instance_exec'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/initializable.rb:30:in `run'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/initializable.rb:55:in `block in run_initializers'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `call'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/initializable.rb:54:in `run_initializers'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/application.rb:352:in `initialize!'
from /home/ubuntu/workspace/config/environment.rb:5:in `<top (required)>'
from /home/ubuntu/workspace/config.ru:3:in `require'
from /home/ubuntu/workspace/config.ru:3:in `block in <main>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/builder.rb:55:in `instance_eval'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/builder.rb:55:in `initialize'
from /home/ubuntu/workspace/config.ru:in `new'
from /home/ubuntu/workspace/config.ru:in `<main>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/builder.rb:49:in `eval'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/builder.rb:49:in `new_from_string'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/builder.rb:40:in `parse_file'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/server.rb:300:in `build_app_and_options_from_config'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/server.rb:209:in `app'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/server.rb:61:in `app'
from /usr/local/rvm/gems/ruby-2.3.4/gems/rack-1.6.9/lib/rack/server.rb:337:in `wrapped_app'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/server.rb:139:in `log_to_stdout'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/server.rb:78:in `start'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
我已经手动创建了以下文件来设置ActionCable：
# app/channels/application_cable/channel.rb
module ApplicationCable
class Channel < ActionCable::Channel::Base
end
end
和
# app/channels/application_cable/connection.rb
module ApplicationCable
class Connection < ActionCable::Connection::Base
identified_by :current_user
def connect
self.current_user = find_verified_user
logger.add_tags 'ActionCable', current_user.email
end
protected
def find_verified_user # this checks whether a user is authenticated with devise
if verified_user = env['warden'].user
verified_user
else
reject_unauthorized_connection
end
end
end
end
我尝试在config / application.rb的顶部同时要求“action_cable”和“action_cable / engine”，但它给了我以下错误：
# including "require 'action_cable/engine' "
/home/ubuntu/workspace/config/application.rb:4:in `require': cannot load such file -- action_cable/engine (LoadError)
from /home/ubuntu/workspace/config/application.rb:4:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `require'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
和
# including "require 'action_cable' "
/home/ubuntu/workspace/config/application.rb:4:in `require': cannot load such file -- action_cable (LoadError)
from /home/ubuntu/workspace/config/application.rb:4:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `require'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `server'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/rvm/gems/ruby-2.3.4/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
因为Rails 5意味着预先加载了actioncable，所以我没有包含任何宝石。
我的config / routes.rb是：
include SessionsHelper
Rails.application.routes.draw do
[...]
mount ActionCable.server => '/cable'
[...]
end
答案 0 :(得分：0)
问题已修复 - 我不知道发生了什么但应用程序没有正确升级，并且在我尝试升级后没有以5.1.5运行。我不得不再次这样做，并从config / application.rb中删除以下行：config.active_record.raise_in_transactional_callbacks = true以使其正常工作。