ruby - Nested forms in Devise (Rails 3.2) - Not saving -

i have setup app using devise gem login (user model). within sign view, ive included simple_fields_for form includes attributes student model.

everything displays correctly in view, when submit button clicked nested record not created.

user model

class user < activerecord::base # include default devise modules. others available are: # :confirmable, :lockable, :timeoutable , :omniauthable devise :database_authenticatable, :registerable,      :recoverable, :rememberable, :trackable, :validatable  # setup accessible (or protected) attributes model attr_accessible :email, :password, :password_confirmation, :remember_me, :role,    :student_attributes # attr_accessible :title, :body  has_one :student, :inverse_of => :user, :autosave => true accepts_nested_attributes_for :student  end 

student model

class student < activerecord::base   attr_accessible :course, :email, :fname, :lname, :student_num, :university, :year    set_primary_key :student_num    belongs_to :user, :inverse_of => :student, :autosave => true    has_many :attendances   has_many :teaching_sessions, through: :attendances    has_many :completed_outcomes    validates :student_num, presence: true   validates :fname, presence: true   validates :lname, presence: true   validates :university, presence: true   validates :course, presence: true   validates :year, presence: true   validates :email, presence: true     def self.import(file) csv.foreach(file.path, headers: true) |row|     student.create! row.to_hash end   end    def full_name     "#{fname} #{lname}"   end  end 

devise registration form

<h2>sign up</h2>  <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name)) |f| %> <%= f.error_notification %>  <h3>login details</h3>  <div class="form-inputs">    <%= f.input :email, :required => true, :autofocus => true %>   <%= f.input :password, :required => true %>   <%= f.input :password_confirmation, :required => true %>   <%= f.select :role, ["student","teacher","admin"], :required => true %> </div>  <h3>profile</h3>  <div id = "student_fields">   <%= simple_fields_for :student |s| %>     <%= s.input :student_num %>     <%= s.input :fname %>     <%= s.input :lname %>     <%= s.input :university %>     <%= s.input :course %>     <%= s.input :year %>   <% end %> </div>  <br />  <div class="form-actions">   <%= f.button :submit, "sign up" %> </div>  <% end %>  <br />  <%= render "devise/shared/links" %> 

custom devise controller

class users::registrationscontroller < devise::registrationscontroller    def new     resource = build_resource({})     resource.build_student     respond_with resource   end    def create super   end    def update super   end  end 

ive read through pretty every post on here, , still cannot find way nested model save when clicking submit button. user record created without problem, student details not save. if has advice hugely grateful. im sure simple i'm missing ive been wrestling day!

best wishes,

mike

have tried "f." on front of simple_fields_for?

<%= f.simple_fields_for :student |s| %> 

see: https://github.com/plataformatec/simple_form#simple-fields-for