Devise + omniauth(facebook) + Profile Model - ruby-on-rails-4

Question

I want to create profile automatically when user is created by devise signup Or by Omniauth-facebook. I have User Model (user.rb)
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable,
:omniauthable, :omniauth_providers => [:facebook]
has_many :listings, dependent: :destroy
has_many :bookings, dependent: :destroy
has_one :profile, dependent: :destroy
before_create :build_profile
def self.from_omniauth(auth)
where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
user.email = auth.info.email
user.password = Devise.friendly_token[0,20]
#Profile.where(:user_id => user.id).update_all(name: auth.info.name)
user.build_profile(name: auth.info.name)
end
end
end
But if I use before_create :build_profile and sign_in with Facebook then two profiles are created
and if I use user.build_profile(name: auth.info.name) in self.from_omniauth(auth) then if I sign_up with Devise ..no profile is created.
so where in this code I Build profile ?
My omniauth_callbacks_controller.rb
class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
def facebook
# You need to implement the method below in your model (e.g. app/models/user.rb)
#user = User.from_omniauth(request.env["omniauth.auth"])
if #user.persisted?
sign_in_and_redirect #user, :event => :authentication #this will throw if #user is not activated
set_flash_message(:notice, :success, :kind => "Faceboo") if is_navigational_format?
else
session["devise.facebook_data"] = request.env["omniauth.auth"]
redirect_to new_user_registration_url
end
end
def failure
redirect_to root_path
end
end