Ruby on Rails: debugging rake tasks

Question

When I write debugger it does not start:

NoMethodError: undefined method `run_init_script' for Debugger:Module from /usr/local/lib/ruby/gems/1.8/gems/ruby-debug-base-0.10.3/lib/ruby-debug-base.rb:239:in `debugger' from (irb):4 

If I run rake my:task --debugger,it returns me to console immediately. How is it possible to debug rake tasks?

Answer 1

I found the solution.

$ gem install ruby-debug $ ruby-debug rake my:task 

or on some systems

$ rdebug rake my:task 

Answer 2

Andrey Kouznetsov's answer didn't work for me using Ruby 1.9.3. The ruby-debug gem doesn't seem to support Ruby 1.9. I had to use the debugger gem: https://github.com/cldwalker/debugger.

1. Add gem 'debugger' to my Gemfile's development group.
2. Run bundle.
3. Add require 'debugger' to the top of my rake task.
4. Add a call to debugger where I wanted a breakpoint in my rake task.
5. Run the rake task normally from the command line, e.g.: rake my:task.