Hi, I'm new to Ruby, having been doing a lot of reading over the last
several weeks and just starting to try out a few things.  I have a
project that I would like to do, but I'm not sure what's the best way to
accomplish the relationships that would like to do.  The project is kind
of a contact management application that goes further down the path in
certain areas.  Vague, I know, but there real question is:

A contact can belong to one or more categories and, with some of those
categories (but not all), additional information is required and/or
desired to be collected, including foreign keys to other tables.  I have
been reading through Agile Web Development and my situation is somewhat
like the single table inheritance (STI) example provided, though
extracted one layer.  That is, in the STI example, a person could exist
in only one of the categories.

A more concrete example would be, say, that for a school, a contact can
be an inquiry, an applicant, a student, a teacher, a mentor, etc.  In
this scenario, a person could be a student and a mentor at the same
time.  Data is collected for applicants and when they are approved, they
become a student (their application data is retained).  A student has
other specific information to be collected and can be linked to other
data in the system.

TIA.
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