Question on polymorphic association

I have 3 models . Doctor, Patient and User
with following associations

class Doctor < ActiveRecord::Base
  has_many :patients, :dependent => :destroy
  has_one :user, :as => :userable
  accepts_nested_attributes_for :user

class Patient < ActiveRecord::Base
  belongs_to :doctor
  has_one :user, :as => :userable
  accepts_nested_attributes_for :user

class User < ActiveRecord::Base
  belongs_to :userable, :polymorphic => true

I have a nested form for doctor and user as
OUTER FORM for :doctor
  INNER FORM for :user

and in my users controller i have a create action as

  def create
    doc_attr = params[:doctor]
    user_attr = doc_attr.delete(:user)
    doctor =!
    doctor.user.create(user_attr) ### getting error on this

When i submit the form i get the error saying undefined method create
for nil:NilClass
I know this is relatively simple. Any help will be greatly
appreciated. Thanks in advance !!!

Ok got this working. :slight_smile: