ruby on rails - Creating Form with accepts_nested_attributes_for -

i have 2 models, user , patient. user has_one patient , patient belongs_to user.

class patient < activerecord::base   belongs_to :user   accepts_nested_attributes_for :user   attr_accessible :user_id, :user_attributes end  # == schema information # # table name: patients # #  id         :integer         not null, primary key #  user_id    :integer #  insurance  :string(255) #  created_at :datetime #  updated_at :datetime #    class user < activerecord::base   has_one :patient    attr_accessible :username, :password, :active, :disabled, :first_name, :last_name,    :address_1, :address_2, :city, :state, :postcode, :phone, :cell, :email   attr_accessor :password end   # == schema information # # table name: users # #  id                 :integer         not null, primary key #  username           :string(255) #  encrypted_password :string(255) #  salt               :string(255) #  active             :boolean #  disabled           :boolean #  last_login         :time #  first_name         :string(255) #  last_name          :string(255) #  address_1          :string(255) #  address_2          :string(255) #  city               :string(255) #  state              :string(255) #  postcode           :string(255) #  phone              :string(255) #  cell               :string(255) #  email              :string(255) #  created_at         :datetime #  updated_at         :datetime # 

in patients controller trying create new patient form.

class patientscontroller < applicationcontroller   def new     @patient = patient.new   end end 

in view (new.html.erb)

<%= form_for @patient |patient_form| %> <% patient_form.fields_for :user |user_fields| %> <table class="formtable" border="0" cellspacing="0" cellpadding="0">     <tr>         <td class="label">             <%= user_fields.label :username %> *:                                </td>         <td class="input">             <%= user_fields.text_field :username, :class=>"textfield" %>         </td>     </tr> </table> ... <%end%> <%end%> 

the form shows blank submit button no generated markup user_fields

i have been told doing wrong because of patient having accepts_nested_attributes_for :user , should user nesting attributes in system want use resources model patient , other user types treated separately.

example database table:

users: id|first_name|last_name...etc

patients: id|user_id|insurance

unless i'm mistaken, have no user when calling fields_for. before can fields_for, need have instance of user can used build form, kind of how have @patient patient_form.

your best bet build user in controller, based off of @patient, , have access in view.