How can I save the user data from Cordova Facebook auth to users table in Rails 4?

I need to get the user data's from Facebook for a mobile app. In Front End we are using angular Cordova plugin to handle Facebook auth login. We are getting the user info such as name, email, gender, image. My question is how do I save those datas in my database.

routes.rb

resources :users
post 'user/facebook' => 'users#facebook'

user.rb

class User < ActiveRecord::Base
attr_accessible :email, :name, :uid, :provider, :gender, :oauth_token

 def self.fbreg(auth)
  user = User.create(name: auth[:name],
    email: auth[:email],        
    provider: auth[:provider],
    uid: auth[:uid],
    gender: auth[:gender],
    image: auth[:image],
    oauth_token: auth[:oauth_token]
   )
  user.skip_confirmation!
  user
 end
end

users_controller.rb

def facebook    
  params[:user][:provider] = "facebook"    
  @user = User.where("uid = ? OR email = ?",params[:user][:uid],params[:user][:email]).first
  if @user.present?      
  sign_in @user
  return render :json => {:success => true, :token => @user.oauth_token, :user => @user}
  else
  @reg = User.fbreg(params[:user])      
  sign_in @reg
  return render :json => {:success => true, :token => @reg.oauth_token}
 end
end

and here I was stuck, Can anyone please help me out here?