Techioz Blog

Railties はそのようなファイルをロードできません

概要

まず、私が Rails の初心者であることを事前に知っておいてください。そのため、これが愚かな間違いであれば申し訳ありませんが、頭を悩ませてきたので、助けを求めたいと思いました。

現在、ローカルの Rails サーバーを突然起動できなくなりました。今日の早い時間に問題なく起動できたので、何が原因でこの問題が発生したのかはわかりません。動作するか動作しない間に私がやった唯一のことは、アプリを Heroku にプッシュする方法を見つけようとしていたことです。

アプリのルートで Rails を実行すると、次のエラーが発生します。

/Users/jonathanmacdonald/code/lrbp/config/application.rb:6:in `require':     cannot load such file -- active_job/railtie (LoadError)
    from /Users/jonathanmacdonald/code/lrbp/config/application.rb:6:in     `<top (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands/commands_tasks.rb:78:in `require'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands/commands_tasks.rb:78:in `block in server'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Library/Ruby/Gems/2.0.0/gems/railties-    4.2.3/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/jonathanmacdonald/code/lrbp/bin/rails:10:in `require'
    from /Users/jonathanmacdonald/code/lrbp/bin/rails:10:in `<top     (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/client/rails.rb:28:in `load'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/client/rails.rb:28:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/client/command.rb:7:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/client.rb:28:in `run'
    from /Library/Ruby/Gems/2.0.0/gems/spring-1.6.2/bin/spring:49:in `<top     (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/binstub.rb:11:in `load'
    from /Library/Ruby/Gems/2.0.0/gems/spring-    1.6.2/lib/spring/binstub.rb:11:in `<top (required)>'
    from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in     `require'
    from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in     `require'
    from /Users/jonathanmacdonald/code/lrbp/bin/spring:13:in `<top     (required)>'
    from bin/rails:4:in `load'
    from bin/rails:4:in `<main>'

Gemfile

source 'https://rubygems.org'

group :production do
  gem 'rails', '4.2.3'
  gem 'pg'
  gem 'rails_12factor'
  gem 'bootstrap-sass'
end

group :development, :test do
  gem 'sqlite3'
  gem 'byebug'
  gem 'web-console', '~> 2.0'
  gem 'spring'
  gem 'binding_of_caller'
  gem 'better_errors'
end

config/application.rb

require File.expand_path('../boot', __FILE__)

require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"
require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module Lrbp
  class Application < Rails::Application
    # Settings in config/environments/* take precedence over those     specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record     auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names.     Default is UTC.
    # config.time_zone = 'Central Time (US & Canada)'

    # The default locale is :en and all translations from     config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.    {rb,yml}').to_s]
    # config.i18n.default_locale = :de

    # Do not swallow errors in after_commit/after_rollback callbacks.
    config.active_record.raise_in_transactional_callbacks = true
    config.assets.initialize_on_precompile = false
  end
end

何を探したり試したりできますか?助けていただければ幸いです。さらに詳しい情報が必要な場合はお知らせください。

解決策

application.rb は次のようになります

require File.expand_path('../boot', __FILE__)

require 'rails/all'

Bundler.require(:default, Rails.env)

module Lrbp
  class Application < Rails::Application

のように各 Rails モジュールを個別に実行する必要はありません。

# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"

使用できます。

  require 'rails/all'

それはこのようなことをします

%w(
  active_record
  action_controller
  action_view
  action_mailer
  rails/test_unit
  sprockets
).each do |framework|
  begin
    require "#{framework}/railtie"
  rescue LoadError
  end
end

と Gemfile

source 'https://rubygems.org'

  gem 'rails', '4.2.3'
  gem 'pg'
  gem 'rails_12factor'
  gem 'bootstrap-sass'

group :development, :test do
  gem 'sqlite3'
  gem 'byebug'
  gem 'web-console', '~> 2.0'
  gem 'spring'
  gem 'binding_of_caller'
  gem 'better_errors'
end

それなら、あなたはそうすべきです

bundle install & bundle exec rails s