问Authlogic:如果用户未登录，如何查找该用户是否未登录

EN

# /app/controllers/users_sessions_controler.rb
def create
  @user_session = UserSession.new(params[:user_session])
  if @user_session.save
    redirect_back_or_default root_path
  elsif @user_session.attempted_record &&
    !@user_session.invalid_password? &&
    !@user_session.attempted_record.active?
    flash[:notice] = render_to_string(:partial => 'user_sessions/not_active.erb', :locals => { :user => @user_session.attempted_record })
    redirect_to :action => :new
  else
    render :action => :new
  end
end

# /app/views/user_sessions/_not_active.erb
Sorry, before you can sign in you need to confirm your email address. <%= link_to('Resend confirmation email', resend_activation_users_path(:login => user.login)) %>

# /app/controllers/users_controller.rb
def resend_activation
  if params[:login]
    @user = User.find_by_login params[:login]
    if @user && !@user.active?
      @user.deliver_activation_instructions!
      flash[:notice] = "Please check your e-mail for your account activation instructions!"
      redirect_to root_path
    end
  end
end

# /config/routes.rb
map.resources :users, :collection => { :resend_activation => :get }

skip_before_filter :require_user