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count会触发数据库操作, length是执行完数据库操作后的ruby指令, 前面where已经查询一波了, 所以这里用length啊 https://stackoverflow.com/questions/6083219/activerecord-size-vs-count |
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添加页面的分页，把length换成count 因为count不会加载所有对象，减少查询时间