How to prevent derived model from Single Table Inheritance in Rails 3.2.13 and how to convert inherited model object as derived model object

Question

I've three models User, Group, Employee. Implemented Single Table Inheritance between User and Group model. But I don't want single table inheritance in Employee model which inherits User model but want to convert User model object as Employee model object. I achieved it by adding a piece of code, self.inheritance_column = :_type_disabled in Employee model and by calling the becomes() method on User object. It works in Rails 3.2.8 but not working in Rails 3.2.13 version.

Exception is:

NoMethodError (undefined method `_type_disabled=' for #<Employee:0xb429428>)

Code snippet is:

class Employee < User

  self.inheritance_column = :_type_disabled

  def self.current

    User.current.becomes(self)

  end

  .
  .
  .
  .
  .
 end

Please give me a solution to achieve this in Rails 3.2.13 too. Thanks in advance!

Answer 1

I got the answer from my friend, we just need to define as virtual attribute in corresponding Model (In my case, Employee Model)

attr_accessor :_type_disabled
self.inheritance_column = :_type_disabled