> class Stuff < ActiveRecord::Base
>     belongs_to :thing
> 
>    my_plugin :id => self.thing.other_id
> 
> end

This is impossible.  self in the above snippet is the Stuff class.  I'm 
assuming you want that to use a instance of Stuff at the time some 
magical method is called.  You have to use a block

class Stuff < ActiveRecord::Base
  my_plugin do |stuff|
    {:id => stuff.thing.other_id}
  end
end

The my_plugin method has to know how to store that block so that the 
instance can call it, passing itself as the first argument.
-- 
Posted via http://www.ruby-forum.com/.

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