Nested Form for Devise User - ruby-on-rails-4

Question

I have devise up and running and everything is work fine, I'm trying to accept_nested_attributes for the user model. I generated a model called degree:
rails g model Degree university:string course:string level:string user:references
rake db:migrate
The form is showing correct but no data is getting saved to the database? in the rails console i ran:
Degree.all
to see if any data is being saved but i get nothing?
registration_controller.rb:
class Users::RegistrationsController < Devise::RegistrationsController
before_filter :configure_permitted_parameters, if: :devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:email, :password, :password_confirmation,
:fname, :mname, :lname, :twitterLink, :githubLink, :stackoverflowLink, :dribbleLink, :mediumLink, degree_attributes: [:university, :course, :level]) }
#devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:fname, :mname, :password, :current_password, :lname) }
end
end
Models
class Degree < ActiveRecord::Base
belongs_to :user
end
----------------------------------
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :degrees
accepts_nested_attributes_for :degrees
end
form where nested attributes are:
<h2>Sign up</h2>
<% resource.degrees.build %>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div class="field">
<%= f.label :email %><br />
<%= f.email_field :email, autofocus: true %>
</div>
<div class="field">
<%= f.label :password %>
<% if #minimum_password_length %>
<em>(<%= #minimum_password_length %> characters minimum)</em>
<% end %><br />
<%= f.password_field :password, autocomplete: "off" %>
</div>
<div class="field">
<%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation, autocomplete: "off" %>
</div>
<div class="field">
<%= f.fields_for :degree do |degree_fields| %>
<%= degree_fields.label :university %>
<%= degree_fields.text_field :university %><br>
<%= degree_fields.label :course %>
<%= degree_fields.text_field :course %><br>
<%= degree_fields.label :level %>
<%= degree_fields.text_field :level %><br>
<% end %>
</div>
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<% end %>
degree_controller.rb
class DegreeController < ApplicationController
def new
#user = User.new
#user.degrees.build(degree_params)
end
def create
#user.degrees.build(degree_params)
end
private
def degree_params
params.require(:degree).permit(:university, :degree, :level)
end
end