杭州受寒潮影响这几日迅速开启了速冻冷藏模式，今年浙江气温较常年同期明显偏低。早上醒来，总有网友提前一步在喊冷。。。。。。雨雪散去，但严寒还在继续，说了很多天的冷空气二连击这次真的要来了！
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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