Hi,
I'm modeling book structures. Currently I have Chapter objects that
belong (ForeignKey) to a Book and each Chapter has sequence number so
the book can know how to order the chapters within itself.  That was
okay until I realized the chapters can be shared between books.

For me that looks a little complex. The 'sequence' doesn't really
belong to the Chapter or the Book, but to their relationship. A
Chapter may have one sequence number when part of Book A, and another
for Book B.

Arggg. I used to write my configuration files in XML format, where
order counts. Moving to SQL is nice, but there are definitely things I
haven't thought of before.

How do you handle a property that belongs to a relationship? A manager
of some sort?

thanks,
--Tim Arnold

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