Define method has helpful stack traces, compared to other meta-programming stuff.

code.rb

class Foo
  %w(bar baz).each do |m|
    define_method("say_#{m}") do
      raise m.to_s
    end
  end
end

f = Foo.new

f.say_bar

gistfile1.txt

$ ruby code.rb 
code.rb:4:in `block (2 levels) in <class:Foo>': bar (RuntimeError)
        from code.rb:11:in `<main>'