attr_readonly error

attr_readonly_error.rb

# Model:

class User < ActiveRecord::Base
  attr_readonly :email
end


# Controller:

user = User.new :email => 'foo@bar.com'
puts user.email
#=> foo@bar.com
user.save
user.update_attributes :email => 'bar@foo.com'
puts user.email
#=> bar@foo.com