[Rails] Re: shared primary key (using the primary key as a foreign key for has_one association)

Kendall, thank's for your suggestion, it really made "id" and
"person_id" equivalent for instructors and stopped the described above
weird (and fun) behavior.

Also,

p=Person.create
m=p.create_member
i=p.create_instructor

work as expected now with setting identical values for p.id, m.id,
m.person_id, i.id, and i.person_id.

When an instructor with the value of id equal to p.id already exists,
i=p.create_instructor
triggers
ActiveRecord::StatementInvalid: SQLite3::ConstraintException: PRIMARY
KEY must be unique: ...

which is a desired behavior.

I will keep testing, and if i do not encounter something extremely
weird, i may stick to this...

Thank you.

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