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    <p>This is really late, but here's how you can find where a method is defined:</p> <p><a href="http://gist.github.com/76951" rel="nofollow noreferrer">http://gist.github.com/76951</a></p> <pre><code># How to find out where a method comes from. # Learned this from Dave Thomas while teaching Advanced Ruby Studio # Makes the case for separating method definitions into # modules, especially when enhancing built-in classes. module Perpetrator def crime end end class Fixnum include Perpetrator end p 2.method(:crime) # The "2" here is an instance of Fixnum. #&lt;Method: Fixnum(Perpetrator)#crime&gt; </code></pre> <p>If you're on Ruby 1.9+, you can use <a href="http://www.ruby-doc.org/core-1.9.3/Method.html#method-i-source_location" rel="nofollow noreferrer"><code>source_location</code></a></p> <pre><code>require 'csv' p CSV.new('string').method(:flock) # =&gt; #&lt;Method: CSV#flock&gt; CSV.new('string').method(:flock).source_location # =&gt; ["/path/to/ruby/1.9.2-p290/lib/ruby/1.9.1/forwardable.rb", 180] </code></pre> <p>Note that this won't work on everything, like native compiled code. The <a href="http://www.ruby-doc.org/core-1.9.3/Method.html" rel="nofollow noreferrer">Method class</a> has some neat functions, too, like <a href="http://www.ruby-doc.org/core-1.9.3/Method.html#method-i-owner" rel="nofollow noreferrer">Method#owner</a> which returns the file where the method is defined.</p> <p>EDIT: Also see the <code>__file__</code> and <code>__line__</code> and notes for REE in the other answer, they're handy too. -- wg</p>
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    1. COsource_location appears to work for 1.8.7-p334 using activesupport-2.3.14
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    2. COafter finding the method, try Method's `owner` method
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