无法加载Rails Server（3.0.11，ruby 1.9.2），没有要加载的此类文件-链轮/ railtie（LoadError）

Question

使用Hartl教程。

命令：rails

响应：

/Users/davidpardy/rails_projects/sample_app/config/application.rb:8:in `require': no such file     to load -- sprockets/railtie (LoadError)
    from /Users/davidpardy/rails_projects/sample_app/config/application.rb:8:in `<top     (required)>'
    from /Users/davidpardy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.11/lib/rails    /commands.rb:28:in `require'
    from /Users/davidpardy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.11/lib/rails    /commands.rb:28:in `block in <top (required)>'
    from /Users/davidpardy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.11/lib/rails    /commands.rb:27:in `tap'
    from /Users/davidpardy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.11/lib/rails    /commands.rb:27:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

下面的application.rb文件

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

# Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"
#require "rails/test_unit/railtie"

if defined?(Bundler)
  # If you precompile assets before deploying to production, use this line
  Bundler.require(*Rails.groups(:assets => %w(development test)))
  # If you want your assets lazily compiled in production, use this line
  #Bundler.require(:default, :assets, Rails.env)
end

module SampleApp
  class Application < Rails::Application
    config.encoding = "utf-8"
    config.filter_parameters += [:password]
    config.assets.enabled = true
    config.assets.version = '1.0'
  end
end

尝试注释掉链轮，只会造成更多问题（不幸的是，事情并没有解决）。

WUG的想法？

Answer 1

您已经将应用程序降级到Rails 3.0，但是在很多地方您的应用程序仅引用3.1方法或文件。

链轮/轨道是其中之一，您的environment.rb中还将有一些设置指向资产管道，可能还涉及其他一些设置（包装参数会浮现在脑海）。 您至少需要删除所有这些。

作为Rails的新手，我强烈建议您从Rails的版本开始，并遵循您所遵循的教程。