在调试模式下的rails服务器

Question

当我尝试使用“rails server --debugger”在调试器模式下运行rails服务器时。我的控制台上出现以下错误。

/home/navyug/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing': uninitialized constant Debugger::LocalInterface::Readline (NameError) 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:55:in `block (2 levels) in initialize' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:53:in `each' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:53:in `block in initialize' 
    from /home/navyug/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/open-uri.rb:35:in `open' 
    from /home/navyug/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/open-uri.rb:35:in `open' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:52:in `initialize' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/processor.rb:61:in `new' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/processor.rb:61:in `initialize' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:9:in `new' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:9:in `<module:Debugger>' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:8:in `<top (required)>' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/rack/debugger.rb:9:in `initialize' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:295:in `new' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:295:in `block in build_app' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:291:in `reverse_each' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:291:in `build_app' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:252:in `start' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands/server.rb:70:in `start' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:55:in `block in <top (required)>' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:50:in `tap' 
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:50:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

RubyGems的环境

• RubyGems的VERSION：1.8.24
• RUBY VERSION：1.9.3（2012-04-20 PATCHLEVEL 194）[i686的Linux的]
• 安装目录： /home/navyug/.rvm/gems/ruby-1.9.3-p194
• Ruby可执行文件：/home/navyug/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
• 可执行目录： /home/navyug/.rvm/gems/ruby-1.9.3-p194/bin
• RubyGems的平台：
  • 红宝石
  • x86的Linux的
• GEM PATHS：
  • /家用/ navyug/.rvm /宝石/红宝石1.9.3-P194
  • /home/navyug/.rvm/gems/ruby-1.9.3-p194@global
• GEM配置：
  • ：update_sources =>真
  • ：冗长=>真
  • ：基准=>假
  • ：回溯=>假
  • ：bulk_threshold => 1000
• REMOTE SOURCES：
  • http://rubygems.org/

Answer 1

我认为您的设置中缺少Readline软件包。由于您使用的是RVM，因此请尝试通过rvm安装readline包。这些链接可能会有所帮助：

• Previous similar SO question related to readline problem
• Fixing Readline for the Ruby on Rails console
• RVM package: Readline