Handle suspended User

application_controller.rb
  ...
  private 

  def authenticate_user!
    super
    check_user_active!
  end

  def check_user_active!
    if current_user && !current_user.active?
      sign_out current_user
      redirect_to new_user_session_path, alert: "This user account has been inactivated. Please check with your administrator if you feel this is in error."
      return false
    else
      return true
    end
  end
  ...