You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: auth_controller.rb
    path of file: ./repos/msgraph-sample-rubyrailsapp/graph-sample/app/controllers
    
    the code of the file until where you have to start completion: # Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# frozen_string_literal: true

class AuthController < ApplicationCon
    
  def callback
    # Access the authentication hash for omniauth
    data = request.env['omniauth.auth']

    # Save the data in the session
    save_in_session data

    redirect_to root_url
  end