加载 Rails Server 时出现问题（3.0.11，ruby 1.9.2），没有要加载的文件——sprockets/railtie (LoadError)

Question

使用 Hartl 教程。

命令：rails s

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，只是产生了更多问题（不幸的是，没有任何结果）。

WUG的想法？

Answer 1

您已将应用程序降级到 Rails 3.0，但您的应用程序仍有许多地方仅引用 3.1 的方法或文件。

sprockets/railtie 就是其中之一，您的environment.rb 中也会有涉及资产管道的设置，可能还有其他一些设置（我会想到包装参数的内容）。您至少需要删除所有这些。

作为 Rails 新手，我强烈建议您从您正在学习的教程所针对的 Rails 版本开始，并坚持使用它。