无法加载Rails服务器（3.0.11，红宝石1.9.2），没有这样的文件加载 - 链轮/ railtie（LoadError）

Question

使用Hartl教程。

命令：轨道小号

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application.rb中文件

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，刚刚创造了更多的问题（和无疾而终的，不幸的是）。

WUG想法？

Answer 1

您已将应用程序降级到了rails 3.0，但仍有许多地方与您的应用程序引用3.1只有方法或文件。

链轮/ railtie就是其中之一，你的environment.rb中也会有一些设置指的是资产管道，也可能是其他一些设置（包装参数的东西可以想到）。你至少需要删除所有这些。

作为一个新的铁轨，我强烈建议你从rails的版本开始，你所遵循的教程是为它写的并坚持下来的。