i have a need to attach attribute(s) to a one to many association. in
essence it would be an association to an association. similar to a
polymorphic association but not. i wanted this to be in another table so
it could handle multiple types of association attributes.  was thinking
i would need "join table name" as well as a concatented key "123_456"
that represents the 2 real indices. what is a good way to generate the
key from either of the related elements.
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