company.rb

   1 class Company < ActiveRecord::Base
   2   has_one :mascot
   3   attr_protected :rating
   4   set_sequence_name :companies_nonstd_seq
   5
   6   validates_presence_of :name
   7   def validate
   8     errors.add('rating', 'rating should not be 2') if rating == 2
   9   end
  10 end