> 3) Can this relation's objects be made "read-only"?  That is:
> "u.room = new_room" would work, but this would not:  "u.room.name =
> 'kitchen'"
>

To clarify the question:

Can this objects seen via this relation be made "read-only"?  That is:

u.room = a_room
u.room = a_new_room
...would work fine.

And this would work, too:
r = session.query(u.room).one()
r.name = "kitchen"

But, this would not:
u.room.name = 'kitchen'

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