Ruby and Rails Debugger 
Single-step or run through Ruby code and ERB files. Set breakpoints,
look at local variables, navigate the call stack, switch threads.
Hover the mouse over a variable in the Editor to evaluate the expressions
and show it in a tooltip.
The NetBeans IDE supports the Fast Ruby Debugger, which also works with JRuby.
You can even attach the debugger to any remote process started from the command line,
and get all the advantages of a user-friendly debugger frontend.
Ruby Projects
The Ruby project type supports Ruby files, RSpec specification files, and YAML files.
Use the Ruby Platform manager to choose between
executing projects using JRuby, or any other native Ruby interpreter on your system.
The IDE has Rake build tool integration and gives you access to the Interactive Ruby Shell (IRB).
Refactoring and support for Test::Unit, Auto Test, Shoulda tests, and RSpec are well integrated.
You can also track hints and errors in the task list.
Ruby on Rails Projects
The Ruby on Rails project type supports Rake targets and database migrations.
The Rake Runner dialog keeps a list of the previously entered parameters
and automatically populates the list of parameters for migrate and fixtures tasks.
You can generate Rails 2.0 projects, or generate code through the Rails code generator graphical wizard.
The logical project view clearly separates controllers from models, views, and database migrations.
Edit ERB files and deploy projects directly to the WEBrick and Mongrel web servers.
You can jump quickly between a Rails action and its corresponding view,
and warp to the browser for the URL most relevant to the file you are editing.
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