people table like this
id int not null auto_increment,
type varchar not null
/* common attributes */
name varchar not null,
email varchar not null,
/* attributes for type=Customer */
balance decimal(10,2),
/* attributes for type=Employee */
================model
-
class person < activerecord::Base
end
class Customer < Person
end
class Employee < Person
end
===========this is a segnment on ''agile web development with
rails''
my silly question is though the autoer note which attribute belong who,
but in the real world, real code, how can I know which is private
attribute for customer or employee?
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