is single table inheritance (STI) available when using polymorphism in mongoid?

When using STI and polymorphism in ActiveRecord, the following is needed to ensure that

:dependent => :destroy

will work properly:

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def attachable_type=(sType)
    super(sType.to_s.classify.constantize.base_class.to_s)
end

Has anyone been using STI and polymorphism successfully with Mongoid?