Google seems to indicate that one may simply mixin (Is that the correct Ruby 
terminology.) parts of ActiveModel into any class as one sees fit. For 
example:http://yehudakatz.com/2010/01/10/activemodel-make-any-ruby-object-feel-like-activerecord/
  
If memory about the way inheritance works in Ruby serves me we should be 
able to do something like that, without even needing to derive from 
ActiveModel directly.  Though in the case of a Rails application one would 
probably just create a stub class that derives from ActiveRecord::Base stick 
the common methods in there and then subclass that class since ActiveModel 
does not include the database related functionality.
 

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