omniauth session controller

sessions_controller.rb

class SessionsController < ApplicationController
  def create
    auth = request.env["omniauth.auth"]
    user = User.find_by_provider_and_uid(auth["provider"], auth["uid"])
    user ||= User.create_with_omniauth(auth)
    session[:user_id] = user.id
    redirect_to [:dashboard, user]
  end

  def destroy
    session[:user_id] = nil
    redirect_to root_path, :notice => "Signed out!"
  end
end