debugging rails with ruby-debug

ruby-debug setup

 sudo gem install ruby-debug

start rails webrick/mongrel web server

 script/server --debugger

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

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。

References

1. http://articles.sitepoint.com/article/debug-rails-app-ruby-debug
2. http://guides.rubyonrails.org/debugging_rails_applications.html