From: Peer Allan <peer@...>
Date: 2007-05-19T02:23:32+09:00
Subject: Constants Question

Hi,

I have building a small custom library and I want to be able to define a
constant in each subclass identifying "valid" options.  Each subclass
will have its own list.

here is how I tried to do it, please ignore the literal values, this is
just an example:

class Base
  def method(option)
    raise MyException unless VALID.include?(option)
    do_with_option(option)
  end
end

class SubClassA < Base
  VALID = ['color','size','weight']
end

class SubClass < Base
  VALID = ['name','phone','email']
end

sub = SubClass.new
sub.option('phone')

This results in a "uninitialized constant VALID" error.  Why is that?
It is like the VALID constant is not being recognized in the subclass.

I would appreciate any direction on how to best handle what I am looking
to do.

Thanks

Peer

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