From: Intransition <transfire@...>
Date: 2009-12-30T05:35:58+09:00
Subject: Re: Using #include at the instance level?



On Dec 29, 3:16 pm, Robert Klemme <shortcut...@googlemail.com> wrote:
> 2009/12/29 Intransition <transf...@gmail.com>:
>
>
>
> > This is really becoming annoying. I can't even do it via a dynamic
> > class definitions either.
>
> >  module M
> >    def m1; "m1"; end
> >    module N
> >      def self.n1; "n1"; end
> >    end
> >  end
>
> >  class X
> >    class << self
> >      alias _new new
> >      def new(&block)
> >        klass = Class.new(self)
> >        klass.class_eval(&block)
> >        klass._new
> >      end
> >    end
>
> >    def m ; m1 ; end
> >    def n ; N.n1 ; end
> >  end
>
> >  x = X.new do
> >    include M
> >  end
>
> >  p x.m
> >  p x.n   #=> uninitialized constant X::N (NameError)
>
> > Did constant lookup change between 1.8.6 and 1.8.7? Seems to me this
> > used to be possible, and I find it unacceptable that normal constant
> > lookup would not apply to dynamic class definitions, let alone the
> > singleton classes.
>
> AFAIK it hasn't changed and your code could never work in any version
> of Ruby because the const lookup in method #n is done _statically_.
> Apart from that you are defining method X#n and not <subclass of X>#n
> so the lookup could never work if you would instantiate X.
>
> Also, on a more abstract level: it is at least a bit odd to define
> class X which can only ever work if you make sure you include "N"
> (whichever way).
>
> I believe you haven't yet fully analyzed the problem you want to
> solve.  I suggest to put it to sleep for a while and then get back
> later to it.  I can't help you any more because to me it is not clear
> what you are trying to achieve.  So far we only went through technical
> issues but the problem you are trying to solve isn't cleat to me yet.

All I am trying to do is emulate test/unit but using a DSL.
Essentially:

  class MyTest < Test::Unit::TestCase

    include M

    def test_N_n1
       assert_equal(N.n1, "n1")
     end

  end

Becomes:

  testcase :MyTest do

    include M

    testunit :N_n1 do
       assert_equal(N.n1, "n1")
     end

  end

That's it. But I can't do it exactly b/c I can't make the include
work.