無法加載Rails Server（3.0.11，ruby 1.9.2），沒有要加載的此類文件-鏈輪/ railtie（LoadError）

Question

使用Hartl教程。

命令：rails

響應：

/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

嘗試注釋掉鏈輪，只會造成更多問題（不幸的是，事情並沒有解決）。

WUG的想法？

Answer 1

您已經將應用程序降級到Rails 3.0，但是在很多地方您的應用程序僅引用3.1方法或文件。

鏈輪/軌道是其中之一，您的environment.rb中還將有一些設置指向資產管道，可能還涉及其他一些設置（包裝參數會浮現在腦海）。 您至少需要刪除所有這些。

作為Rails的新手，我強烈建議您從Rails的版本開始，並遵循您所遵循的教程。