Rails - Jan 2007 - polymorphic on has_one side of relationship

I want to specify the following one-to-one relationship where
an "Event" has one "FeeStructure".

Essentially:

  class Event < ActiveRecord::Base
    has_one :fee_structure
  end

  class FeeStructure < ActiveRecord::Base
    belongs_to :event
  end

The issue though is that FeeStructure is polymorphic.
For example, I have FeeStructureTypeA and FeeStructureTypeB
(they share common characteristics but they have different
representation).

It seems to me that want I''d need to do is the following:

  class Event < ActiveRecord::Base
    has_one :fee_structure :polymorphic => true
  end

  class FeeStructureTypeA < ActiveRecord::Base
    belongs_to :event, :as => fee_structure
  end

  class FeeStructureTypeB < ActiveRecord::Base
    belongs_to :event, :as => fee_structure
  end


However this does not seem to be supported.
Option ":polymorphic" appears to be supported only on
"belongs_to".

Looks like the only way I could make this work is if I would
reverse the relationship. But that does not really make sense
since "Event" is the parent in that relationship.

Am I missing something here to make this work?

Thanks,

P.

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