Debugging rails with ruby-debug

1. setup
$> sudo gem install ruby-debug

2. start rails webrick/mongrel web server
$> script/server --debugger

3. using debugger in controller

class PeopleController < ApplicationController def new debugger # 当应用程序访问到此行时，在console中会出现debugger控制台 @person = Person.new end end

4. debugger shell 命令帮助

(rdb:40) help
ruby-debug help v0.10.3
Type 'help ' for help on a specific command

Available commands:
backtrace delete enable help next quit show
break disable eval info p reload source
catch display exit irb pp restart step
condition down finish list ps save thread
continue edit frame method putl set trace

其中比较常用的是next/list/continue/method/backtrace命令。

更多关于ruby-debug，查看以下链接：
http://articles.sitepoint.com/article/debug-rails-app-ruby-debug
http://guides.rubyonrails.org/debugging_rails_applications.html