# File lib/mongo_mapper/plugins/sci.rb, line 12
        def inherited(subclass)
          super
          if @collection_name == subclass.instance_variable_get("@collection_name")
            key :_type, String unless key?(:_type)
            subclass.single_collection_parent = self
            subclass.instance_variable_set("@single_collection_inherited", true)
          else
            remove_key :_type
          end
        end