It wasn't strictly polymorphism, but the term you wrote led me to a article[1] where it mentioned "alternative parent". This alone instantly made the problem mo

It wasn't strictly polymorphism, but the term you wrote led me to a article[1] where it mentioned "alternative parent". This alone instantly made the problem more understandable for me. [1]http://duhallowgreygeek.com/polymorphic-association-bad-sql-smell/ http://duhallowgreygeek.com/polymorphic-association-bad-sql-...