django 2.X 关联外键时会报错：TypeError: init() missing 1 required positional argument: ‘on_delete’

django 2.X 关联外键时会报错：TypeError: __init__() missing 1 required positional argument: ‘on_delete’

 #python3 manage.py makemigrations

报错：

解决办法：

contact = models.ForeignKey(Contact, on_delete=models.CASCADE)

加参数：

on_delete=models.CASCADE

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