RSpecをインストールしようとすると、なぜこのエラーが発生しますか？

Question

私は前にRSpecのを使用しており、これは私が実行しようとすると、私はこのエラーを取得する最初の時間です：

rails generate rspec:install 

それは、このエラーが発生：

/Users/ldco2016/Projects/workout_app/config/application.rb:11:in `require': cannot load such file -- action_cable/engine (LoadError) 
    from /Users/ldco2016/Projects/workout_app/config/application.rb:11:in `<top (required)>' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:82:in `require' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:82:in `preload' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:143:in `serve' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application.rb:125:in `run' 
    from /Users/ldco2016/.rvm/gems/ruby-2.2.5/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>' 
    from /Users/ldco2016/.rvm/rubies/ruby-2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' 
    from /Users/ldco2016/.rvm/rubies/ruby-2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' 
    from -e:1:in `<main>' 

は、これが私のgemfileです：

ソース 'https://rubygems.org'

git_source（：github）do | repo_name | repo_name = "＃{repo_name} /＃{repo_name}" repo_name.includeない限り？（ "/"） "https://github.com/# {repo_name} .git" これは私のconfig/application.rbある

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '~> 4.2.0' 
# Use sqlite3 as the database for Active Record 
gem 'sqlite3' 
# Use Puma as the app server 
gem 'puma', '~> 3.0' 
# Use SCSS for stylesheets 
gem 'sass-rails', '~> 5.0' 
# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 
# Use CoffeeScript for .coffee assets and views 
gem 'coffee-rails', '~> 4.2' 
# See https://github.com/rails/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks 
gem 'turbolinks', '~> 5' 
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.5' 
# Use Redis adapter to run Action Cable in production 
# gem 'redis', '~> 3.0' 
# Use ActiveModel has_secure_password 
# gem 'bcrypt', '~> 3.1.7' 

# Use Capistrano for deployment 
# gem 'capistrano-rails', group: :development 

group :development, :test do 
    gem 'rspec-rails', '3.2.3' 
    # Call 'byebug' anywhere in the code to stop execution and get a debugger console 
    gem 'byebug', platform: :mri 
end 

group :development do 
    # Access an IRB console on exception pages or by using <%= console %> anywhere in the code. 
    gem 'web-console', '>= 3.3.0' 
    gem 'listen', '~> 3.0.5' 
    # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
    gem 'spring' 
    gem 'spring-watcher-listen', '~> 2.0.0' 
end 

group :test do 
    gem 'capybara', '2.4.4' 
end 

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem 
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby] 

端：

require_relative 'boot' 

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 "action_cable/engine" 
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 WorkoutApp 
    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. 
    end 
end 

Answer 1

この問題はRSpecとは関係ありません。 Rails 4アプリケーション（Gemfileによる）にaction_cableをロードしようとしています。これはRails 5の組み込み機能です。あなたのapplication.rbからこの行を削除するだけです。

require "action_cable/engine" 

あなたが本当に独立Railsのモジュールをロードする必要がない場合は、単に置き換えるすべてで必要となる、：

app/application.rbで

require 'rails/all' 

Answer 2

、コメント"require "action_cable/engine"