在學習《Flask Web開發----基於Python的Web應用開發實戰》的過程中，調試程序，如下圖，運行報錯：
AttributeError: 'SQLAlchemy' object has no attribute 'Foreignkey'
原因：是關鍵字Foreignkey里的字母k應該是大寫，錯寫成小寫字母了
解決辦法，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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