All, I'm just announcing and looking for feedback for a quick little plugin I wrote: acts_as_readonly (kevincolyar (Kevin Colyar) · GitHub acts_as_readonly/tree/master)
Some info:
ActsAsReadonly
Why not use ActiveRecord's readonly!() feature while fetching the record instead?
Readonly <> immutable in memory in my opinion. I don't see why you need to raise exceptions for column assignments as long as they are not stored back to the database.