mvb:~ cms$ irb
001:0> class C
002:1> end
nil
003:0> C.ancestors.select {|a| a.class == Module}
[Wirble::Shortcuts, PP::ObjectMixin, Kernel]

You can tell I require wirble and pp in my irbrc.

module TestModule
  def say_something
    puts "SOMETHING"
  end
end

class Test
  include TestModule
end

t = Test.new
puts t.included_modules

So, use self.class to get the Class object of the current instance (this
will work from the included modules also), so you should be able to do:

self.class.included_modules

And a debugging efficiency tip: use the Array#sort method with the
Module#included_modules to sort the list of included modules for easier
viewing.  I use this all the time in IRB. (This also works with
Class#methods and all the like)

irb(main):001:0> YourClass.methods.sort

On Sun, 8 Jul 2007, Travis D Warlick Jr wrote:

   "".class.included_modules

etc.  It's not dependent on your having included a module.

David

Another one I use a lot, when I think that some class is likely to
have a method with some  substring  in its name, is:

YourClass.methods.grep /substring/

e.g. : String.methods.grep /case/ # to find out what the String method
name to uppercase (or lowercase) a string, is called.
or
"".methods.grep /case/