method definition location

Want to find the location of a method definition?

ruby-1.9.2-p290 :003 > Order.last.method(:bill_address_id=).source_location
 => ["/Users/gagan/.rvm/gems/ruby-1.9.2-p290/bundler/gems/spree_address_book-f261e916b432/app/models/order_decorator.rb", 19]

Or if the method is a class method do

> ActionView::Helpers::AssetTagHelper.method(:cache_asset_timestamps).source_location
 => ["/Users/gagan/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.0.10/lib/active_support/core_ext/module/attribute_accessors.rb", 10] 

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