Uninitialized constant when using nested attributes in STI subclass

I have a class / model called User which (using single table inheritance) has a subclass called Student (among others)

The student has an association of 'has_one' with 'HomeAddress' which is a subclass of 'Place'

My model is set up:

class User < ActiveRecord::Base
end

class Student < User
    has_one :home_address, :dependent => :destroy
    accepts_nested_attributes_for :home_address
end

class Place < ActiveRecord::Base
end

class HomeAddress < Place
    belongs_to :student
end

      

        
        
        
      

    

In my student manager, I am trying to create a new student and associated HomeAddress to navigate to my view:

class StudentsController < ApplicationController

def new

@student = Student.new
@student.build_home_address

end

      

        
        
        
      

    

however, I am getting the error:

:uninitialized constant Student::HomeAddress

      

        
        
        
      

    

This issue is clearly related to the @ student.build_home_address line, but I don't understand why it is causing this error. I have checked all the naming conventions (e.g. models, controllers, associations) and other nested attribute relationships working in my application. Perhaps there is a problem with having nested attributes for the STI subclass? (i.e. HomeAddress)

Let me know if you want to see any other code. Thank.