On Thu, Mar 7, 2013 at 12:26 PM, Joel Pearson <[email protected]> wrote:
> Can this work for constants as well? I have a several constants within a
> long class name and I was wondering whether I can use this approach, but
> it doesn't seem to be working for me:
>
> irb(main):001:0> class A
> irb(main):002:1> B = 1
> irb(main):003:1> end
> => 1
> irb(main):004:0> A::B
> => 1
> irb(main):005:0> A.new.instance_eval do
> irb(main):006:1* puts B
> irb(main):007:1> end
> NameError: uninitialized constant B
> from (irb):6:in `block in irb_binding'
> from (irb):5:in `instance_eval'
> from (irb):5
> from C:/Ruby193/bin/irb:12:in `<main>'
Const lookup works differently from other identifiers (IIRC it's done
via lexical scope). Having said that you can do
irb(main):007:0> A.new.instance_eval { self.class.const_get :B }
=> 1
Well, probably not what you wanted. :-)
How do you want to use that feature (if it existed)? Maybe there's
another elegant solution.
Kind regards
robert
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