Error classes for lazy bums like myself example

errorclasses

  #The following two examples are equivalent 
  
  #Example 1, explicit error classe declaration
  class MyMainNamespace
    module Errors
      class Error1 < StandardError; end
      class Error2 < StandardError; end
    end
  end
  
  #Example 2, use const_missing for maximum lazyness
  class MyMainNamespace
    module Errors
      def self.const_missing class_name
        self.const_set( class_name , Class.new( StandardError ) )
        self.const_get( class_name )
      end
    end
  end
  
  #usage:
    being
      do_something
    rescue MyMainNamespace::Errors::Error1
      do_something_else
    rescue MyMainNamespace::Errors::Error2
      do_something_different
    #only works with second example, throws an invalid constant Error404 otherwise  
    rescue MyMainNamespace::Errors::Error404
      error_not_found
    end