Joel Dezenzio wrote in post #1173071:
> I hate to go overboard on this question but I think a lot can be learned
> here.
>
> Your question dives into several sub-topics at once (database
> normalization, model associations, and ERD structures).  I would
> concentrate on the following first:

>
> Even though books have a published date, the edition might change the
> age of the book.
>
> I hope this example helps.

I have completely no idea where you are going with the question.. :'(
Sorry!
I think you told me much about the Rails structure in your answer but
did not answer my question.

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