Rails - Dec 2007 - problem with acts_as_sti_factory plugin

When I have the subclasses in the parent class file itself I am able to
get the names of the subclasses using <Class_name>.type_options using
acts_as_sti_factory plugin.

But if each of the subclass is a separate rb file then  type_options is
not getting the sub class name.

Example: In my sort_field.rb, I have

class SortField < ActiveRecord::Base
  def self.inheritance_column
    ''sort_type''
  end
end

class AscendingSortField < SortField
end

class DescendingSortField < SortField
end

Now SortField.type_options would fetch me the names of the subclasses.

But if I have the subclasses in a separate file such as
ascending_sort_field.rb and descending_sort_field.rb the same does not
help.

Please help me..
-- 
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