甘肃最近发生了地震，地震灾区夜晚的最低温度达到了零下15度，这样极端的天气给救援带来了很大的困难。有专家表示，如果夜里零下15度的话，被困者只能持续十个小时左右，如果十个小时之内等不来救援的话，这些被困者
Is there a compact way with ActiveRecord to query for what id it\'s going to use next if an object was going to be p开发者_如何学Pythonersisted to the database? In SQL, a query like this would look so
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