[Rails] Active Record Model From Legacy query

I have a situation where I have some legacy tables that have what I
will call conditional relations. One table is a log and has actions
and action_notes columns if the action is a certain number(value) the
the contents of the action_notes will be a foreign key to another
table but then it can actually be a note for other actions.... Hope
that makes sense. So whats the best rails approach?

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