Ruby class registry for registering, and looking up classes using a key, rather than the class name. Decouples looking up classes from their name and namespace.
gem install regstry
Note the missing i in the gem name. The name registry is taken by another gem.
require 'registry'
class Obj
include Registry
end
class One < Obj
register :one
end
class Two < Obj
register :two
end
one = Obj[:one].new
two = Obj[:two].new