#SuperclassHash

SuperclassHash is a hash that you could use if you are storing values under class keys. If hash does not have particular class key it would serach through superclasses and return the first available value if any.

require "superclass_hash"

class A
end

class B < A
end

superhash = SuperclassHash.new
superhash[A] = "a"
superhash[A] # => "a"
superhash[B] # => "a"