8216
こんにちわ。rails初心者です。  
現在Railsチュートリアル第3章を進めています。そこで下記コマンドを実行するとエラーが出てしまいました。解決する方法をご存知の方がいらっしゃいましたらアドバイスください。お願いします。

実行コマンド

```

    rails generate rspec:install
    
```

エラー

```

    /Users/mofuty/rails_projects/sample_app/config/application.rb:5:in `require': cannot load such file -- active_job/railtie (LoadError)
        from /Users/mofuty/rails_projects/sample_app/config/application.rb:5:in `<top (required)>'
        from /Users/mofuty/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.0.5/lib/rails/commands.rb:43:in `require'
        from /Users/mofuty/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.0.5/lib/rails/commands.rb:43:in `<top (required)>'
        from bin/rails:8:in `require'
        from bin/rails:8:in `<main>'
    
```

Gemfile

```

    source 'https://rubygems.org'
    ruby '2.1.2'
    #ruby-gemset=railstutorial_rails_4_0
    
    gem 'rails', '4.0.5'
    
    group :development, :test do
      gem 'sqlite3', '1.3.8'
      gem 'rspec-rails', '2.13.1'
    end
    
    group :test do
      gem 'selenium-webdriver', '2.35.1'
      gem 'capybara', '2.1.0'
    end
    
    gem 'sass-rails', '4.0.5'
    gem 'uglifier', '2.1.1'
    gem 'coffee-rails', '4.0.1'
    gem 'jquery-rails', '3.0.4'
    gem 'turbolinks', '1.1.1'
    gem 'jbuilder', '1.0.2'
    
    group :doc do
      gem 'sdoc', '0.3.20', require: false
    end
    
    group :production do
      gem 'pg', '0.15.1'
      gem 'rails_12factor', '0.0.2'
    end
    
```

config/application.rb

```

    require File.expand_path('../boot', __FILE__)
    
    # 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 the gems listed in Gemfile, including any gems
    # you've limited to :test, :development, or :production.
    Bundler.require(*Rails.groups)
    
    module SampleApp
      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
      end
    end
    
```
CC BY-SA 3.0
2015-03-21T11:09:08.930
8215
2015-03-21T12:07:44.360
2015-03-21T11:26:01.260
8613
8613
question
ruby-on-rails rbenv
Ruby on Rails - rails generate rspec:installが実行できない
~~試しに`bundle exec rails generate rspec:install` を実行してみてください。~~

たしかにapplication.rbがちょっと変ですね。  
4.0系だとこんな感じになるはずです。

```

    require File.expand_path('../boot', __FILE__)
    
    # Pick the frameworks you want:
    require "active_record/railtie"
    require "action_controller/railtie"
    require "action_mailer/railtie"
    require "sprockets/railtie"
    # require "rails/test_unit/railtie"
    
    # Require the gems listed in Gemfile, including any gems
    # you've limited to :test, :development, or :production.
    Bundler.require(:default, Rails.env)
    
    module CbMorning
      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
      end
    end
    
```

`active_job`とかは4.0系では通常出てこないので、一度このコードに置き換えてみてください。

原因はよくわかりませんが、もしかすると4.2系の実行環境で rails newしてしまったのかもしれません。

## 追記

4.2系でrails newしていると、今後他にも問題が出てくるかもしれません。  
4.0.5で作っていくなら、バージョンを指定してrails newし直した方が早いかもです。

```

    rails -v
    Rails 4.2.0
    # 4.0.5ではない場合
    rails _4.0.5_ new sample_app
    
```
CC BY-SA 3.0
2015-03-21T11:39:17.663
8216
2015-03-21T12:07:44.360
2015-03-21T12:07:44.360
85
85
8215
answer