From: Devin Mullins <twifkak@...>
Date: 2005-09-28T13:15:15+09:00
Subject: Re: Dynamically generating classes?

Here's another way you might do it:

ERROR_CODES = {
  :MyEx1 => {'code' => 1, 'message' => "Oops!"},
  :MyEx2 => {'code' => 2, 'message' => "Whoops!"},
  }

#StandardError'd be the canonical one to inherit.
#Exceptions outside of that tree are typically Ruby errors (bad syntax, 
no memory, etc.).
class MyError < StandardError
  def to_s
    "{code: #{CODE}, message: #{MESSAGE}}"
  end
end

for k, v in ERROR_CODES
  Object.const_set(k, Class.new(MyError) {
    CODE = v['code']
    MESSAGE = v['message']
  })
end

o = MyEx1.new
p o
__END__

#<MyEx1: {code: 2, message: Whoops!}>

I think it's a little cleaner, but that's partially taste.

Devin