Railties 无法加载此类文件

Question

首先，你应该预先知道我是 Rails 新手，所以如果这是一个愚蠢的错误，我深表歉意，但我一直在绞尽脑汁，并认为我会寻求一些帮助。

我目前无法突然启动本地 Rails 服务器。不知道我做了什么导致了这个问题，因为我今天早些时候就可以开始了。在它工作和不工作之间我所做的唯一一件事就是试图弄清楚如何将应用程序推送到 Heroku。

在应用程序的根目录中运行

rails s

时，我收到此错误：

/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>'

宝石档案

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

我研究后尝试过的事情

• bundle exec rails server

  ->> 仍然无法启动并产生完全相同的错误
• 暂时

  mv Gemfile.lock ..

  ，以便我可以用

  bundle install

  重新生成它 ->> 没有变化。同样的错误。

• gem pristine --all

  ->> 没有变化。同样的错误。

• gem uninstall rails

  ，然后

  gem install rails

  ->> 没有变化。同样的错误。

设置

• OS X 10.11.2
• 导轨4.2.3
• 红宝石2.0.0

我可以寻找或尝试什么？任何帮助表示赞赏。如果您需要更多信息来帮助我，请告诉我。

Answer 1

你的

application.rb

看起来像

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

require 'rails/all'

Bundler.require(:default, Rails.env)

module Lrbp
  class Application < Rails::Application

您不需要像这样单独使用每个 Rails 模块

# 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"

可以使用。

  require 'rails/all'

它会做这样的事情

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

和 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

那你应该这样做

bundle install & bundle exec rails s

Answer 2

确保您在 Gemfile 中包含

gem 'sprockets-rails'

。