Description

Currently, ActiveRecord only stores the "demodulized" name of the class making not possible to have subclasses in a different namespace of the baseclass.

To illustrate the issue:

class CollectionItem < ActiveRecord::Base; end
class ComicCollection::Item < CollectionItem; end

item = ComicCollection::Item.new
item.type # => 'Item'

item2 = CollectionItem.find(item.id) # raise an error because can't find class Item

This patch fixes this issue and add a configuration option to enable/disable it in order to keep back-compatibility.