Using const_missing to do automatic require


I’d like to def const_missing to require the appropriate file, without
needing to put require ‘filename’ in the top of my code.

Something like

const_missing MyMod::MyClass --> require ‘my_mod/my_class’ ; return

I got this idea from ActiveRecord.

Any comments / advice on using this for general programmign? Any
reason not to? I think it would clean up a lot of the require lines,
and make refactoring (and moving things around) easier, without really


It’s already built into Ruby. Try ‘ri autoload’.



On Mar 15, 2006, at 3:43 PM, Trans wrote:

It’s already built into Ruby. Try ‘ri autoload’.

Holy cow, I never knew that. Thanks for the info!

James Edward G. II


Sorry - that’s something else.

Rails’ automatically loads the file just by mentioning a class of that
name - you don’t need to configure it anywhere.

autoload allows you to specificy once which file to load for a class.
It’s no shorter than just requiring it - I guess it’s a performance