> I'm pretty new to Ruby and I'm looking for an enum-like-type just to
> make my code more readeable, but maybe I'm taking a wrong approach
> (badly influenced bu others languages I know, no names please :-)) and

> going against some ruby pragmatic principles, don't know.
> Anyway, if you do know something in the language that might help to
> accomplish modeling enums like the example below, in a more clever
way,
> I'll appreciate the tip.

The common usage is Symbols. Read about them at:
http://phrogz.net/ProgrammingRuby/language.html#symbols
http://www.ruby-doc.org/core/classes/Symbol.html

You can then use them like:

def foo(action)
  case action
    when :do_this ...
    when :do_that ...
    Else raise "unknown action #{action}"
  end
end

foo(do_this)
doo(do_something_else)