<% if PraiseTread.where("praise_tread_object_id=? and praise_tread_object_type=? and user_id=?",activity.id,activity.class.to_s,User.current.id).empty? %> 赞 <% num = get_praise_num(activity) %> <%= num > 0 ? "（#{num}）" : "" %> <% else %> 已赞 <% num = get_praise_num(activity) %> <%= num > 0 ? "（#{num}）" : "" %> <% end %>