save and redirect

application_controller.rb

  def after_sign_in_path_for(resource)
    if resource.is_a?(User)
      redirect_after_login = session[:redirect_after_login]
      if redirect_after_login
        clear_redirect_after_login
        return redirect_after_login
      end
    else
      super
    end
  end

  def after_sign_out_path_for(resource)
    new_user_session_path
  end

  def store_redirect_after_login
    session[:redirect_after_login] = request.fullpath
  end

  def clear_redirect_after_login
    session[:redirect_after_login] = nil
  end

  def permission_denied
    respond_to do |format|
      format.html do
        unless current_user
          store_redirect_after_login
          redirect_to new_user_session_path
        else
          redirect_to dashboard_path
        end
      end
    end
  end