Access the Method object
Dead simple: Get the method object and ask for its owner:
"foo".method(:upcase)
# => #<Method: String#upcase>
"foo".method(:upcase).owner
# => String
Look up a method's source location
Ruby 1.9 adds a method Method#source_location that returns file and line number where that method is defined.
class Example; def method() end; end
# => nil
Example.new.method(:method).source_location
# => ["(irb)", 11]
"foo".method(:upcase).source_location
# => nil # String#upcase is a native method that's defined in C
Look up a method's source code
If your Gemfile comes with
method_source
Show archive.org snapshot
(a dependency of Rails 7+), you can can inspect the source code directly using the Method#source method:
puts User.new.method(:name).source
# =>
# def name
# "#{first_name} #{last_name}".strip
# end
Also see
Posted by Dominik Schöler to makandra dev (2013-03-20 09:28)