在学习《Flask Web开发----基于Python的Web应用开发实战》的过程中，调试程序，如下图，运行报错：
AttributeError: 'SQLAlchemy' object has no attribute 'Foreignkey'
原因：是关键字Foreignkey里的字母k应该是大写，错写成小写字母了
解决办法，改成ForeignKey即可
role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
AttributeError: 'SQLAlchemy' object has no attribute 'Foreignkey'
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