sqlalchemy.exc.ArgumentError: Mapper mapped class User->user could not assemble any primary key colu

学习flask-emigrate时候出现报错： sqlalchemy.exc.ArgumentError: Mapper mapped class User->user could not assemble any primary key columns for mapped table ‘user’ 然后上网查了好多解决办法，都不行，最后发现是我代码出问题，一个超级低级的错误……………… 我这里

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