support-center_snippet-4.rb

class Auth0Controller < ApplicationController
   
   ...
   
   def callback
    user = find_or_create_user

    session[:user_id] = user.id

    if user.admin?
      session[:admin_user_id] = user.id

      redirect_to admin_root_path
    else
      redirect_to root_path
    end
  end
   
  private

  def find_or_create_user
    info = request.env.fetch('omniauth.auth').fetch('info')
    user_email = info.fetch('email')
    user = User.find_by(email: user_email)

    return user if user

    User.create!(email: user_email)
  end
end